Jason R. Franz

Works (70)

Updated: November 23rd, 2024 05:02

2024 article

Foot-Ankle Mechanical Transmission: Age Effects and the Relation to Ankle Push-Off During Walking

Gray, A. J., Takahashi, K. Z., Kashefsky, H. E., & Franz, J. R. (2024, November 5). JOURNAL OF APPLIED BIOMECHANICS.

By: A. Gray n, K. Takahashi*, H. Kashefsky* & J. Franz n

author keywords: power generation; aging; ultrasound; metatarsal phalangeal joint
Source: Web Of Science
Added: November 18, 2024

2024 article

Modifying loading during gait leads to biochemical changes in serum cartilage oligomeric matrix protein concentrations in a subgroup of individuals with anterior cruciate ligament reconstruction

Armitano-Lago, C., Evans-Pickett, A., Davis-Wilson, H., Munsch, A., Longobardi, L., Willcockson, H., … Pietrosimone, B. (2024, February 15). CLINICAL RHEUMATOLOGY.

author keywords: Anterior cruciate ligament reconstruction; Biofeedback; Biomarkers; Blood; Cartilage oligomeric matrix protein; Walking
TL;DR: Manipulating lower limb loading in ACLR patients who habitually exhibit an acute increase in sCOMP following walking results in improved biochemical changes linked to cartilage health, and may provide an intervention strategy to mitigate the development of PTOA following ACLR. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: February 26, 2024

2024 journal article

Muscle contributions to reduced ankle joint contact force during drop vertical jumps in patients with chronic ankle instability

JOURNAL OF BIOMECHANICS, 163.

By: J. Jang*, J. Franz n, B. Pietrosimone* & E. Wikstrom*

author keywords: Ankle sprain; Ankle degeneration; Osteoarthritis; Musculoskeletal modeling; OpenSim
TL;DR: It is suggested that patients with chronic ankle instability exhibit lower ankle joint loading patterns than uninjured individuals during a drop vertical jump, which may be considered in rehabilitation to potentially reduce the risk of early onset of ankle joint degeneration. (via Semantic Scholar)
Source: Web Of Science
Added: February 19, 2024

2024 article

Peak vertical ground reaction force used to identify sub-groups of individuals with differing biomechanical gait profiles post-anterior cruciate ligament reconstruction

Collins, K., Lisee, C., Bjornsen, E., Armitano-Lago, C., Buck, A., Buttner, C., … Pietrosimone, B. (2024, August 6). JOURNAL OF ORTHOPAEDIC RESEARCH.

By: K. Collins*, C. Lisee, E. Bjornsen*, C. Armitano-Lago*, A. Buck*, C. Buttner*, T. Blackburn*, T. Schwartz* ...

author keywords: functional data analysis; knee osteoarthritis; walking biomechanics
Source: Web Of Science
Added: August 14, 2024

2024 article

Plantar massage or ankle mobilization do not alter gait biomechanics in those with chronic ankle instability: a randomized controlled trial

Alamri, R., Migel, K., Cain, M. S., Song, K., Pietrosimone, B., Blackburn, J. T., … Wikstrom, E. A. (2024, October 11). JOURNAL OF MANUAL & MANIPULATIVE THERAPY.

author keywords: Center of pressure; ankle sprains; manual therapy
Source: Web Of Science
Added: November 4, 2024

2023 article

3D characterization of the triple-bundle Achilles tendon from in vivo high-field MRI

Cone, S. G., Kim, H., Thelen, D. G., & Franz, J. R. (2023, July 10). JOURNAL OF ORTHOPAEDIC RESEARCH.

By: S. Cone*, H. Kim*, D. Thelen* & J. Franz n

author keywords: Achilles tendon; MRI; subtendon; triceps surae
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: July 24, 2023

2023 article

A Wearable System for Continuous Monitoring and Assessment of Speech, Gait, and Cognitive Decline for Early Diagnosis of ADRD

2023 45TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE & BIOLOGY SOCIETY, EMBC.

By: J. Dieffenderfer n, A. Brewer n, M. Noonan n, M. Smith n, E. Eichenlaub*, K. Haley*, A. Jacks*, E. Lobaton n ...

TL;DR: This paper presents a low cost and low power wearable system custom designed to track the trends in speech, gait, and cognitive stress while also considering the important human factor needs such as privacy and compliance. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: February 26, 2024

2023 review

Age-related changes in gait biomechanics and their impact on the metabolic cost of walking: Report from a National Institute on Aging workshop

[Review of ]. EXPERIMENTAL GERONTOLOGY, 173.

author keywords: Mobility; Fatigue; Muscle energetics; Wearable technology; Tendon
MeSH headings : United States; Biomechanical Phenomena; National Institute on Aging (U.S.); Walking; Gait
TL;DR: How gait mechanics and energy cost change with aging, the potential neuromuscular mechanisms and role of connective tissue in these changes, and cutting-edge interventions and technologies that may be used to measure and improve gait and mobility in older adults are highlighted. (via Semantic Scholar)
Source: Web Of Science
Added: June 19, 2023

2023 article

Delayed cartilage oligomeric matrix protein response to loading is associated with femoral cartilage composition post-ACLR

Lisee, C., Evans-Pickett, A., Davis-Wilson, H., Munsch, A. E., Longobardi, L., Schwartz, T. A., … Pietrosimone, B. (2023, June 16). EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY.

author keywords: Biomarkers; Serum; Cartilage; COMP; MRI
TL;DR: Greater delayed sCOMP response to loading, a biomarker of cartilage breakdown, is associated with worse lateral femoral cartilage composition in the ACLR limb compared to the uninjured limb. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: June 26, 2023

2023 journal article

Does the effect of walking balance perturbations generalize across contexts?

HUMAN MOVEMENT SCIENCE, 93.

By: A. Shelton n, E. McTaggart n, J. Allen*, V. Mercer*, J. Crenshaw* & J. Franz n

author keywords: Stability; Gait; Control
TL;DR: The purpose of this study was to determine if the effect of balance perturbations on instability generalizes across contexts, and found no "goldilocks" perturbation paradigm to endorse that would support universal interpretations about locomotor instability. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: January 16, 2024

2023 journal article

Knee kinetics and the medial femoral cartilage cross-sectional area response to loading in indviduals with anterior cruciate ligament reconstruction

CLINICAL BIOMECHANICS, 105.

By: E. Bjornsen*, H. Davis-Wilson*, A. Evans-Picket*, W. Horton*, C. Lisee, A. Munsch n, D. Nissman*, J. Blackburn*, J. Franz n, B. Pietrosimone*

author keywords: ACL reconstruction; Ultrasound; Cartilage cross-sectional area; Knee abduction moment; Knee extension moment
MeSH headings : Humans; Osteoarthritis, Knee; Anterior Cruciate Ligament Injuries / surgery; Knee Joint; Gait / physiology; Lower Extremity; Cartilage, Articular; Anterior Cruciate Ligament Reconstruction / methods; Biomechanical Phenomena
TL;DR: The propensity of femoral cartilage to acutely increase cross-sectional area in response to walking is consistent with less-dynamic knee abduction and knee extension moment profiles. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: June 19, 2023

2023 journal article

Physical Activity Associates with T1rho MRI of Femoral Cartilage After Anterior Cruciate Ligament Reconstruction

MEDICINE & SCIENCE IN SPORTS & EXERCISE, 56(3), 411–417.

author keywords: MODERATE-TO-VIGOROUS PHYSICAL ACTIVITY; MVPA; DAILY STEPS; ACCELEROMETRY; CARTILAGE COMPOSITION; POSTTRAUMATIC KNEE OSTEOARTHRITIS
TL;DR: Lesser physical activity may be a risk factor for maintainingcartilage health following ACLR; additionally, the relationship between physical activity and cartilage health may be different between males and females. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: Web Of Science
Added: March 11, 2024

2023 article

Sustained Limb-Level Loading: A Ground Reaction Force Phenotype Common to Individuals at High Risk for and Those With Knee Osteoarthritis

Bjornsen, E., Berkoff, D., Blackburn, J. T., Davis-Wilson, H., Evans-Pickett, A., Franz, J. R., … Pietrosimone, B. (2024, January 17). ARTHRITIS & RHEUMATOLOGY.

By: E. Bjornsen*, D. Berkoff*, J. Blackburn*, H. Davis-Wilson*, A. Evans-Pickett*, J. Franz n, M. Harkey*, W. Horton* ...

TL;DR: Individuals 6-12 months post anterior cruciate ligament reconstruction exhibit strikingly similarGRF profiles as individuals with KL2 KOA, suggesting both patient groups may benefit from targeted interventions to address aberrant GRF profiles. (via Semantic Scholar)
Source: Web Of Science
Added: January 29, 2024

2022 article

A Low-Cost, Open Source Wireless Body Area Network for Clinical Gait Rehabilitation

2022 IEEE SENSORS.

By: J. Twiddy n, K. Peterson n, G. Maddocks n, R. MacPherson, R. Pimentel n, M. Yates n, C. Armitano-Lago*, A. Kiefer* ...

author keywords: wearable; wireless body area network; inertial measurement unit; gait rehabilitation; biomechanics; vertical; ground reaction force
TL;DR: An inexpensive I MU-based wireless body area network capable of recording 9-axis motion data from 8 sites on the body simultaneously capable of generating data comparable to existing commercial sensor networks is described. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: February 27, 2023

2022 journal article

Linking Gait Biomechanics and Daily Steps After ACL Reconstruction

MEDICINE & SCIENCE IN SPORTS & EXERCISE, 54(5), 709–716.

By: C. Lisee*, H. Davis-Wilson*, A. Evans-Pickett*, W. Horton*, J. Blackburn*, J. Franz n, L. Thoma*, J. Spang*, B. Pietrosimone*

author keywords: MECHANICAL LOADING; VERTICAL GROUND REACTION FORCE; OSTEOARTHRITIS; PHYSICAL ACTIVITY
MeSH headings : Anterior Cruciate Ligament Injuries / surgery; Biomechanical Phenomena; Body Weight; Child, Preschool; Cross-Sectional Studies; Female; Gait; Humans; Infant; Knee Joint; Male
TL;DR: After ACLR, individuals who take the fewest daily steps also walk with lesser vGRF during weight acceptance and a stiffened knee strategy throughout stance and these results highlight complex interactions between joint loading parameters after ACLR. (via Semantic Scholar)
UN Sustainable Development Goal Categories
1. No Poverty (OpenAlex)
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: June 27, 2022

2022 review

Multimodal Diagnostic Approaches to Advance Precision Medicine in Sarcopenia and Frailty

[Review of ]. NUTRIENTS, 14(7).

author keywords: sarcopenia; sarcopenic obesity; precision medicine; intramuscular fat
MeSH headings : Aged; Aging; Frailty / complications; Frailty / diagnosis; Humans; Obesity; Precision Medicine; Quality of Life; Sarcopenia / complications; Sarcopenia / diagnosis; Sarcopenia / therapy; Syndrome
TL;DR: Clinical, radiographic, and biological data can be used to evaluate older adults with sarcopenia and sarcopenic obesity and to further the understanding of the mechanisms leading to declines in physical function and frailty. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
3. Good Health and Well-being (Web of Science; OpenAlex)
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: April 25, 2022

2022 journal article

Quadriceps Muscle Action and Association With Knee Joint Biomechanics in Individuals with Anterior Cruciate Ligament Reconstruction

JOURNAL OF APPLIED BIOMECHANICS, 38(5), 328–335.

By: A. Munsch, A. Evans-Pickett, H. Davis-Wilson, B. Pietrosimone & J. Franz

author keywords: secondary knee osteoarthritis; gait biomechanics; ultrasound; fascicle
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: January 3, 2023

2022 journal article

Quantifying mechanical and metabolic interdependence between speed and propulsive force during walking

FRONTIERS IN SPORTS AND ACTIVE LIVING, 4.

By: R. Pimentel n, J. Feldman n, M. Lewek* & J. Franz n

author keywords: gait; locomotion; treadmill; walking economy; energy expenditure; push-off
TL;DR: Empirical data is provided in support of an interdependent relation between propulsive force (FP) and walking speed, building confidence that interventions designed to increase FP will translate to improved walking speed. (via Semantic Scholar)
Source: Web Of Science
Added: October 3, 2022

2022 journal article

Shorter muscle fascicle operating lengths increase the metabolic cost of cyclic force production

JOURNAL OF APPLIED PHYSIOLOGY, 133(3), 524–533.

By: O. Beck*, L. Trejo*, J. Schroeder*, J. Franz n & G. Sawicki*

author keywords: dynamometer; economy; efficiency; energetic; length
MeSH headings : Animals; Ankle / physiology; Ankle Joint / physiology; Biomechanical Phenomena; Humans; Locomotion; Muscle Contraction / physiology; Muscle, Skeletal / physiology; Tendons / physiology
TL;DR: The metabolic energy expenditure of human participants as they cyclically produced two distinct ankle moments at three ankle angles on a fixed-position dynamometer is quantified to reduce metabolic energy expended during locomotion. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: September 12, 2022

2022 journal article

Slowing down to preserve balance in the presence of optical flow perturbations

GAIT & POSTURE, 96, 365–370.

By: A. Shelton n, E. McTaggart n, J. Allen*, V. Mercer* & J. Franz n

author keywords: Stability; Walking; Gait; Speed
MeSH headings : Adult; Exercise Test; Female; Gait / physiology; Humans; Male; Optic Flow; Postural Balance / physiology; Walking / physiology; Young Adult
TL;DR: The findings suggest that during walking, when presented with a balance challenge, an individual will instinctively reduce their walking speed in order to better preserve stability, but comparisons to prior literature suggest that this response may depend on environmental and/or perturbation context. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 8, 2022

2022 journal article

The metabolic cost of walking balance control and adaptation in young adults

GAIT & POSTURE, 96, 190–194.

By: S. Ahuja* & J. Franz n

author keywords: Stability; Energy; Perturbations; Optimization; Optical flow
MeSH headings : Biomechanical Phenomena; Exercise Test; Gait / physiology; Humans; Postural Balance / physiology; Walking / physiology; Young Adult
TL;DR: The study reveals that the adoption of generalized anticipatory control at the onset of optical flow balance perturbations and the subsequent shift to task-specific reactive control following prolonged exposure have meaningful metabolic consequences. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: July 26, 2022

2021 article

A sound approach to improving exoskeletons and exosuits

Franz, J. R. (2021, November 10). SCIENCE ROBOTICS, Vol. 6.

By: J. Franz n

MeSH headings : Exoskeleton Device
TL;DR: Onboard ultrasound imaging to an exosuit enhances muscle-machine coordination to improve economy of locomotion and reduce the risk of injury. (via Semantic Scholar)
Source: Web Of Science
Added: December 13, 2021

2021 journal article

Age does not affect the relationship between muscle activation and joint work during incline and decline walking

JOURNAL OF BIOMECHANICS, 124.

author keywords: Gait; Biomechanics; Joint work; EMG; Aging
MeSH headings : Adult; Aged; Ankle Joint; Biomechanical Phenomena; Gait; Humans; Knee Joint; Muscle, Skeletal; Walking; Young Adult
TL;DR: The electromechanical cost of joint work production does not underlie the age-related reconfiguration of jointWork during walking, and age does not affect the relationship between muscle activation and net joint work during incline and decline walking at freely-chosen step lengths. (via Semantic Scholar)
Source: Web Of Science
Added: July 26, 2021

2021 journal article

Age-related changes to triceps surae muscle-subtendon interaction dynamics during walking

SCIENTIFIC REPORTS, 11(1).

By: W. Clark n & J. Franz n

MeSH headings : Achilles Tendon / physiology; Adult; Age Factors; Aged; Aging; Ankle Joint / physiology; Biomechanical Phenomena; Humans; Middle Aged; Muscle, Skeletal / physiology; Musculoskeletal Physiological Phenomena; Tendons / physiology; Walking; Young Adult
TL;DR: The findings suggest that the capacity for sliding between subtendons may facilitate independent TS muscleActuation in young adults but may restrict that actuation in older adults, likely contributing to reduced push-off intensity. (via Semantic Scholar)
Source: Web Of Science
Added: November 15, 2021

2021 journal article

Age-related differences in calf muscle recruitment strategies in the time-frequency domain during walking as a function of task demand

JOURNAL OF APPLIED PHYSIOLOGY, 131(4), 1348–1360.

By: H. Kim n & J. Franz n

author keywords: activation; elderly; electromyography; frequency; plantar flexor
MeSH headings : Aged; Ankle; Electromyography; Humans; Muscle, Skeletal; Walking; Walking Speed; Young Adult
TL;DR: The results implicate GAS time-frequency content, and its morphological and neural origins, as a potential determinant of hallmark ankle push-off deficits due to aging, particularly at faster walking speeds. (via Semantic Scholar)
Source: Web Of Science
Added: November 1, 2021

2021 journal article

Association of Quality of Life With Moderate-to-Vigorous Physical Activity After Anterior Cruciate Ligament Reconstruction

JOURNAL OF ATHLETIC TRAINING, 57(6), 532–539.

author keywords: daily steps; physical activity; Knee Injury and Osteoarthritis Outcome Score; patient-reported outcomes
MeSH headings : Adolescent; Adult; Anterior Cruciate Ligament Injuries / complications; Anterior Cruciate Ligament Injuries / surgery; Anterior Cruciate Ligament Reconstruction; Cross-Sectional Studies; Exercise; Female; Humans; Knee Joint / surgery; Male; Quality of Life; Retrospective Studies; Young Adult
TL;DR: Symptomatic individuals with ACLR who spent more time in MVPA reported higher quality of life, and no significant associations existed between KOOS-QOL, daily steps, and MVPA in the asymptomatic group. (via Semantic Scholar)
Source: Web Of Science
Added: February 20, 2023

2021 article

Cueing Changes in Peak Vertical Ground Reaction Force to Improve Coordination Dynamics in Walking

Armitano-Lago, C., Pietrosimone, B., Evans-Pickett, A., Davis-Wilson, H., Franz, J. R., Blackburn, T., & Kiefer, A. W. (2021, May 15). JOURNAL OF MOTOR BEHAVIOR.

author keywords: biofeedback; anterior cruciate ligament reconstruction; cross recurrence; relative phase
MeSH headings : Anterior Cruciate Ligament Injuries / surgery; Anterior Cruciate Ligament Reconstruction; Biomechanical Phenomena; Gait; Humans; Knee Joint; Walking
TL;DR: With thoughtful consideration for movement control, biofeedback can be used to target mechanisms leading to long-term deleterious joint adaptations. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: July 6, 2021

2021 article

Editorial: Tendon Structure-Function Relationship in Health, Ageing, and Injury

Maas, H., Arndt, T., & Franz, J. R. (2021, June 18). FRONTIERS IN SPORTS AND ACTIVE LIVING, Vol. 3.

By: H. Maas*, T. Arndt* & J. Franz n

author keywords: subtendon; non-uniform deformation; Achilles tendon; ultrasound; aging; skeletal muscle
Source: Web Of Science
Added: July 19, 2021

2021 journal article

Personalized fusion of ultrasound and electromyography-derived neuromuscular features increases prediction accuracy of ankle moment during plantarflexion

BIOMEDICAL SIGNAL PROCESSING AND CONTROL, 71.

By: Q. Zhang n, W. Clark n, J. Franz n & N. Sharma n

Contributors: Q. Zhang n, W. Clark n, J. Franz n & N. Sharma n

author keywords: Ultrasound imaging; Surface electromyography; Isometric ankle plantarflexion; Support vector machine regression; Feedforward neural network; Human effort prediction
TL;DR: Findings indicate that the combination of sEMG signals and US imaging is a superior sensing modality for predicting human plantarflexion intention and can enable future clinical rehabilitation devices. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: October 4, 2021

2021 article

Reduced Achilles Tendon Stiffness Disrupts Calf Muscle Neuromechanics in Elderly Gait

Krupenevich, R. L., Beck, O. N., Sawicki, G. S., & Franz, J. R. (2021, July 16). GERONTOLOGY.

author keywords: Aging; Biomechanics; Stiffness; Energy expenditure; Muscle mechanics; Ankle exoskeleton
MeSH headings : Achilles Tendon / physiology; Aged; Ankle / physiology; Ankle Joint / physiology; Biomechanical Phenomena / physiology; Gait / physiology; Humans; Muscle, Skeletal / physiology; Walking / physiology
TL;DR: The hypothesis that age-related declines in Achilles tendon stiffness increase the metabolic cost of walking due to less economical calf muscle contractions and increased proximal joint work is explored. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 2, 2021

2021 journal article

The metabolic and mechanical consequences of altered propulsive force generation in walking

JOURNAL OF BIOMECHANICS, 122.

author keywords: Biomechanics; Oxygen consumption; Aging; Elderly; Fatigue
MeSH headings : Aged; Ankle; Ankle Joint; Biomechanical Phenomena; Gait; Humans; Walking
TL;DR: The findings suggest that walking with a diminished push-off exacts a metabolic penalty because of higher step frequencies and more total limb work due to an increased demand on proximal leg muscles. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: June 10, 2021

2020 journal article

Biofeedback augmenting lower limb loading alters the underlying temporal structure of gait following anterior cruciate ligament reconstruction

HUMAN MOVEMENT SCIENCE, 73.

author keywords: DFA; Nonlinear; Feedback; Variability
MeSH headings : Adult; Anterior Cruciate Ligament Injuries / surgery; Anterior Cruciate Ligament Reconstruction; Biofeedback, Psychology; Biomechanical Phenomena; Female; Gait; Humans; Lower Extremity / surgery; Male; Movement; North Carolina; Orthopedics; Surveys and Questionnaires; Universities; Young Adult
TL;DR: Results indicate that altering lower extremity load changes the temporal persistence of the stride internal dynamics in ACLR individuals, demonstrating the implications of the design of gait training interventions and the influence feedback has on movement strategies. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: November 16, 2020

2020 journal article

Biomechanical effects of manipulating peak vertical ground reaction force throughout gait in individuals 6-12 months after anterior cruciate ligament reconstruction

CLINICAL BIOMECHANICS, 76.

By: A. Evans-Pickett*, H. Davis-Wilson*, B. Luc-Harkey*, J. Blackburn*, J. Franz n, D. Padua*, M. Seeley*, B. Pietrosimone*

author keywords: Knee; Biofeedback; Gait-training; Unloading
MeSH headings : Adult; Anterior Cruciate Ligament Injuries / physiopathology; Anterior Cruciate Ligament Injuries / surgery; Anterior Cruciate Ligament Reconstruction; Biomechanical Phenomena; Female; Gait / physiology; Humans; Male; Mechanical Phenomena
TL;DR: Cueing a 5% body weight increase in vertical ground reaction force impact peak resulted in a more dynamic vertical ground reacted force loading pattern, increased knee excursion, and a greater internal extension moment during stance which may be useful in restoring gait patterns following anterior cruciate ligament reconstruction. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: June 29, 2020

2020 journal article

Can optical flow perturbations detect walking balance impairment in people with multiple sclerosis?

PLOS ONE, 15(3).

MeSH headings : Accidental Falls / prevention & control; Adult; Biomechanical Phenomena / physiology; Exercise Test / methods; Female; Foot / physiology; Gait / physiology; Humans; Lower Extremity / physiology; Male; Multiple Sclerosis / diagnostic imaging; Multiple Sclerosis / physiopathology; Optic Flow / physiology; Postural Balance / physiology; Virtual Reality; Walking / physiology
TL;DR: Investigating the effects of optical flow perturbations applied using virtual reality on walking balance in multiple sclerosis revealed differences in Walking balance in PwMS that went undetected during normal, unperturbed walking. (via Semantic Scholar)
Source: Web Of Science
Added: June 15, 2020

2020 journal article

Effects of Horizontal Impeding Force Gait Training on Older Adult Push-Off Intensity

MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 53(3), 574–580.

By: K. Conway n, K. Crudup n, M. Lewek* & J. Franz n

author keywords: FUNCTIONAL PERFORMANCE; GAIT BIOMECHANICS; REHABILITATION; EXERCISE
MeSH headings : Aged; Aging / physiology; Ankle; Ankle Joint / physiology; Biomechanical Phenomena / physiology; Energy Transfer; Equipment Design; Female; Gait / physiology; Heart Rate / physiology; Humans; Male; Muscle Strength / physiology; Preliminary Data; Resistance Training / instrumentation; Resistance Training / methods; Tendons / physiology; Treatment Outcome; Walking / physiology; Walking Speed / physiology
TL;DR: It is concluded that the use of horizontal impeding forces in older adults improves their maximum muscular and walking capacities while encouraging access to newfound strength gains, thereby improving habitual push-off intensity during walking. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: March 15, 2021

2020 journal article

Effects of aging and target location on reaction time and accuracy of lateral precision stepping during walking

JOURNAL OF BIOMECHANICS, 104.

By: B. Selgrade*, M. Childs n & J. Franz n

author keywords: Elderly; Balance; Foot Placement; Stability; Gait
MeSH headings : Adolescent; Adult; Aged; Aged, 80 and over; Aging; Exercise Test; Foot; Gait; Humans; Male; Postural Balance; Reaction Time; Walking; Young Adult
TL;DR: This is the first study to show a potential neuromuscular basis for precision stepping deficits in older adults, and suggests that age-related deficits other than those in visuomotor processing contribute to poorer performance for more difficult stepping tasks. (via Semantic Scholar)
UN Sustainable Development Goal Categories
1. No Poverty (OpenAlex)
Source: Web Of Science
Added: May 18, 2020

2020 journal article

Gradually learning to increase gait propulsion in young unimpaired adults

HUMAN MOVEMENT SCIENCE, 75.

By: L. Herrero n, J. Franz n & M. Lewek*

author keywords: Gait; Propulsion; Motor learning; Implicit; Explicit
MeSH headings : Adolescent; Adult; Ankle / physiology; Ankle Joint / physiology; Biomechanical Phenomena; Extremities; Feedback, Sensory / physiology; Female; Gait / physiology; Gait Disorders, Neurologic / physiopathology; Humans; Learning / physiology; Male; Stress, Mechanical; Walking; Young Adult
TL;DR: Test the effect of DVF of gait propulsion on the capacity to alter propulsive forces, and to determine the biomechanical determinants of propulsion to offer promise of translation to clinical populations with propulsion deficits. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: March 15, 2021

2020 journal article

Imaging and Simulation of Inter-muscular Differences in Triceps Surae Contributions to Forward Propulsion During Walking

ANNALS OF BIOMEDICAL ENGINEERING, 49(2), 703–715.

By: W. Clark n, R. Pimentel n & J. Franz n

author keywords: Triceps surae; Neuromechanics; Ultrasound; OpenSim; Forward propulsion
MeSH headings : Adult; Computer Simulation; Electromyography; Female; Humans; Male; Models, Biological; Muscle, Skeletal / diagnostic imaging; Muscle, Skeletal / physiology; Ultrasonography; Walking / physiology; Young Adult
TL;DR: Evaluated triceps surae contributions to forward propulsion using conditions that systematically manipulated both walking speed and the mechanical demand for forward propulsion at a fixed speed suggest that the biarticular gastrocnemius muscles play a more significant role than the uniarticular soleus in governing changes in forward propulsion during the mid to late stance phase of walking. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: September 28, 2020

2020 journal article

Immediate Biochemical Changes After Gait Biofeedback in Individuals With Anterior Cruciate Ligament Reconstruction

JOURNAL OF ATHLETIC TRAINING, 55(10), 1106–1115.

author keywords: cartilage oligomeric matrix protein; vertical ground reaction force; posttraumatic osteoarthritis; biomarkers
MeSH headings : Adolescent; Adult; Anterior Cruciate Ligament Injuries / surgery; Anterior Cruciate Ligament Reconstruction; Biofeedback, Psychology / methods; Biomarkers / metabolism; Biomechanical Phenomena; Cohort Studies; Cross-Over Studies; Female; Gait / physiology; Humans; Knee Joint / physiopathology; Knee Joint / surgery; Male; Walking / physiology; Young Adult
TL;DR: Increasing peak vGRF during gait decreased sComP in individuals with ACLR who naturally demonstrated an increase in sCOMP after 20 minutes of walking. (via Semantic Scholar)
Source: Web Of Science
Added: November 16, 2020

2020 journal article

Older Adults Overcome Reduced Triceps Surae Structural Stiffness to Preserve Ankle Joint Quasi-Stiffness During Walking

JOURNAL OF APPLIED BIOMECHANICS, 36(4), 209–216.

author keywords: Achilles tendon; activation; aging; plantar flexor; biofeedback
TL;DR: Despite age-related reductions during isolated contractions, ankle joint quasi-stiffness was maintained in older adults during walking, which may be governed via activation-mediated increases in muscle stiffness. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 17, 2020

2020 journal article

Shorter gastrocnemius fascicle lengths in older adults associate with worse capacity to enhance push-off intensity in walking

GAIT & POSTURE, 77, 89–94.

By: K. Conway n & J. Franz n

author keywords: Ultrasound; Plantarflexor; Triceps surae; Elderly; Gait; Biomechanics
MeSH headings : Adult; Age Factors; Aged; Biomechanical Phenomena; Female; Gait / physiology; Humans; Leg / diagnostic imaging; Leg / physiology; Leg / physiopathology; Male; Muscle, Skeletal / diagnostic imaging; Muscle, Skeletal / physiology; Muscle, Skeletal / physiopathology; Self-Help Devices; Tendons / physiology; Ultrasonography; Walking / physiology; Young Adult
TL;DR: These findings provide muscle-level insight to develop more effective rehabilitation techniques to improve push-off intensity in older adults and assistive technologies designed to steer plantarflexor muscle fascicle operating behavior during functional tasks. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Source: Web Of Science
Added: April 6, 2020

2020 journal article

The effects of knee extensor moment biofeedback on gait biomechanics and quadriceps contractile behavior

PEERJ, 8.

By: A. Munsch n, B. Pietrosimone* & J. Franz n

author keywords: Walking; Osteoarthritis; Joint loading; Rehabilitation; Gait training; Ultrasound; Biofeedback
TL;DR: Targeted pKEM biofeedback may be a useful rehabilitative and/or scientific tool to elicit desirable changes in knee joint biomechanics considered relevant to the development of osteoarthritis. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: July 20, 2020

2020 review

These legs were made for propulsion: advancing the diagnosis and treatment of post-stroke propulsion deficits

[Review of ]. JOURNAL OF NEUROENGINEERING AND REHABILITATION, 17(1).

author keywords: Propulsion; Locomotion; Walking; Rehabilitation; Diagnosis; Intervention; Sensors; Robotics
MeSH headings : Biomechanical Phenomena; Female; Gait Disorders, Neurologic / physiopathology; Gait Disorders, Neurologic / rehabilitation; Humans; Leg / physiopathology; Locomotion / physiology; Male; Middle Aged; Paresis / etiology; Paresis / physiopathology; Paresis / rehabilitation; Stroke / complications; Stroke / physiopathology; Stroke Rehabilitation; Walking / physiology
TL;DR: It is proposed that post-stroke rehabilitation should aim to promote independent walking, in part, through the acquisition of enhanced propulsion, and emerging diagnostic and treatment approaches that have the potential to facilitate new rehabilitation paradigms targeting propulsion restoration are discussed. (via Semantic Scholar)
Source: Web Of Science
Added: November 16, 2020

2019 journal article

Activation-Dependent Changes in Soleus Length-Tension Behavior Augment Ankle Joint Quasi-Stiffness

JOURNAL OF APPLIED BIOMECHANICS, 35(3), 182–189.

By: W. Clark n & J. Franz n

author keywords: impedance; prostheses; foot; neuromechanics; Achilles tendon
MeSH headings : Ankle Joint / diagnostic imaging; Ankle Joint / physiology; Biomechanical Phenomena; Electromyography; Female; Humans; Isometric Contraction / physiology; Male; Muscle Contraction / physiology; Muscle, Skeletal / diagnostic imaging; Muscle, Skeletal / physiology; Ultrasonography; Young Adult
TL;DR: The authors found that soleus muscle stiffness (kM) and kA exhibit nonlinear relations with muscle activation and both were more sensitive to the onset of activation than to subsequent increases in activation. (via Semantic Scholar)
Source: Web Of Science
Added: June 17, 2019

2019 journal article

Ankle power biofeedback attenuates the distal-to-proximal redistribution in older adults

GAIT & POSTURE, 71, 44–49.

By: M. Browne n & J. Franz n

author keywords: Plantarflexor; Push-off; Gait; Elderly; Hip
MeSH headings : Aged; Ankle Joint / physiology; Biofeedback, Psychology; Biomechanical Phenomena; Female; Gait / physiology; Humans; Kinetics; Male; Walking / physiology; Walking Speed; Young Adult
TL;DR: Older adults are capable of increasing ankle power through targeted ankle power biofeedback - effects that are accompanied by diminished hip power output and attenuation of the distal-to-proximal redistribution. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: July 8, 2019

2019 journal article

Can shank acceleration provide a clinically feasible surrogate for individual limb propulsion during walking?

JOURNAL OF BIOMECHANICS, 98.

By: N. Pieper n, M. Lewek* & J. Franz n

author keywords: Biomechanics; Ankle Power; Wearables; Accelerometers; Push-off
MeSH headings : Acceleration; Adult; Aging / physiology; Biomechanical Phenomena; Extremities / physiology; Feasibility Studies; Female; Gait / physiology; Humans; Male; Mechanical Phenomena; Walking / physiology; Young Adult
TL;DR: The findings in young adults provide an early benchmark for the development of affordable and clinically feasible alternatives for assessing and monitoring trailing limb propulsion during walking. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: February 10, 2020

2019 journal article

How age and surface inclination affect joint moment strategies to accelerate and decelerate individual leg joints during walking

JOURNAL OF BIOMECHANICS, 98.

author keywords: Induced acceleration analysis; Eccentric; Concentric; Gait; Aging
MeSH headings : Acceleration; Adolescent; Adult; Aged; Aged, 80 and over; Aging / physiology; Biomechanical Phenomena; Exercise Test; Female; Gait; Humans; Joints / physiology; Kinetics; Leg / physiology; Male; Surface Properties; Walking / physiology; Young Adult
TL;DR: Results suggest that during level and uphill walking increased hip flexor mechanical output in older adults does not arise from reduced ankle moments, contrary to increased hip extensor mechanical output, and implies that preserved eccentric knee extensor function is important in maintaining knee stabilization in older age. (via Semantic Scholar)
Source: Web Of Science
Added: February 10, 2020

2019 journal article

Increasing the Propulsive Demands of Walking to Their Maximum Elucidates Functionally Limiting Impairments in Older Adult Gait

JOURNAL OF AGING AND PHYSICAL ACTIVITY, 28(1), 1–8.

By: K. Conway n & J. Franz n

author keywords: ankle moment; biomechanics; impeding forces; push-off
MeSH headings : Aged; Aging; Ankle Joint; Biomechanical Phenomena; Gait; Humans; Walking; Walking Speed; Young Adult
TL;DR: It was found that older adults walked at their preferred speed with hallmark deficits in push-off intensity, and age-related deficits in ankle moment emerged as the lone genuine functionally limiting impairment in older adults. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: July 6, 2020

2019 journal article

Time-dependent tuning of balance control and aftereffects following optical flow perturbation training in older adults

JOURNAL OF NEUROENGINEERING AND REHABILITATION, 16.

By: J. Richards n, B. Selgrade n, M. Qiao*, P. Plummer*, E. Wikstrom* & J. Franz n

MeSH headings : Aged; Biomechanical Phenomena; Female; Humans; Male; Muscle, Skeletal / physiology; Physical Therapy Modalities; Postural Balance / physiology; Sensation Disorders / rehabilitation; Walking / physiology
TL;DR: Investigation of the propensity for time-dependent tuning of walking balance control and the presence of aftereffects following a single session of optical flow perturbation training suggests that older adults respond to the onset of perturbations using generalized anticipatory balance control, deprioritize that strategy following prolonged exposure to perturbATIONS, and exhibit short-term aftereeffects that indicate a lessening of anticipatory control, an increase in reactive control, and/or increased balance confidence. (via Semantic Scholar)
Source: Web Of Science
Added: July 22, 2019

2019 journal article

Triceps surae muscle-subtendon interaction differs between young and older adults

CONNECTIVE TISSUE RESEARCH, 61(1), 104–113.

By: W. Clark n & J. Franz n

author keywords: Ultrasound; biomechanics; speckle tracking; interfascicle adhesions; plantarflexor
MeSH headings : Achilles Tendon / physiology; Adult; Aged; Aging / physiology; Ankle Joint / physiology; Biomechanical Phenomena; Female; Humans; Male; Muscle Contraction / physiology; Muscle, Skeletal / physiology; Walking / physiology
TL;DR: These findings provide an important biomechanical basis for previously reported correlations between more uniform Achilles subtendon behavior and reduced ankle moment generation during waking in older adults. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: December 16, 2019

2019 journal article

Visuomotor error augmentation affects mediolateral head and trunk stabilization during walking

HUMAN MOVEMENT SCIENCE, 68.

By: M. Qiao*, J. Richards n & J. Franz n

author keywords: Optical flow; Medio-lateral; Anchor; Adaptation; Stability
MeSH headings : Adaptation, Physiological / physiology; Adult; Biomechanical Phenomena; Exercise Test / methods; Feedback, Sensory / physiology; Female; Head Movements / physiology; Humans; Male; Postural Balance / physiology; Psychomotor Performance / physiology; Torso / physiology; Vestibule, Labyrinth / physiology; Visual Perception / physiology; Walking / physiology; Young Adult
TL;DR: It is found that subjects did not minimize errors between the visual perception of movement and actual movement of the head and trunk, and lasting reductions in mediolateral postural sway may have implications for using error-augmented optical flow to enhance the integrity of walking balance control through training, for example in older adults. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: December 30, 2019

2018 journal article

Advanced Age Redistributes Positive but Not Negative Leg Joint Work during Walking

MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 51(4), 615–623.

author keywords: ECCENTRIC; CONCENTRIC; BIOMECHANICS; GAIT; AGING
MeSH headings : Adolescent; Adult; Age Factors; Aged; Aging / physiology; Ankle / physiology; Biomechanical Phenomena; Female; Gait Analysis; Humans; Knee / physiology; Leg / physiology; Male; Muscle Contraction / physiology; Muscle, Skeletal / physiology; Walking / physiology; Walking Speed / physiology; Young Adult
TL;DR: Exercise prescription should focus on improving ankle muscle function while preserving knee muscle function in older adults trying to maintain their independence, as distal-to-proximal redistribution of positive joint work during level and uphill walking is absent. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: April 2, 2019

2018 journal article

Aging effects on leg joint variability during walking with balance perturbations

GAIT & POSTURE, 62, 27–33.

By: M. Qiao n, J. Feld* & J. Franz n

author keywords: Visual feedback; Elderly; Gait; Stability; Falls; Kinematics
MeSH headings : Adult; Aged; Aging / physiology; Ankle Joint / physiology; Female; Gait / physiology; Healthy Volunteers; Hip Joint / physiology; Humans; Knee Joint / physiology; Male; Postural Balance / physiology; Range of Motion, Articular / physiology; Walking / physiology; Young Adult
TL;DR: It is found that leg joint variability during walking is gait phase-dependent, with step-to-step adjustments occurring predominantly during push-off and early swing, and perturbations elicited larger and more pervasive increases in all joint kinematic outcome measures in older adults. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2018 journal article

Ankle Rotation and Muscle Loading Effects on the Calcaneal Tendon Moment Arm: An In Vivo Imaging and Modeling Study

ANNALS OF BIOMEDICAL ENGINEERING, 47(2), 590–600.

By: J. Franz n, A. Khanchandani*, H. McKenny n & W. Clark n

author keywords: Ultrasound; Plantarflexor; Triceps surae; OpenSim; Dynamometry
MeSH headings : Achilles Tendon / diagnostic imaging; Achilles Tendon / physiology; Adult; Ankle Joint / diagnostic imaging; Ankle Joint / physiology; Diagnostic Imaging; Female; Humans; Isometric Contraction / physiology; Isotonic Contraction / physiology; Male; Models, Biological; Movement / physiology; Muscle, Skeletal / diagnostic imaging; Muscle, Skeletal / physiology; Rotation; Weight-Bearing / physiology
TL;DR: It is found that muscle loading independently increased the CTma by up to 8% and attenuated the effects of ankle joint rotation, the latter likely through changes in tendon slack and tendon curvature, which contribute to improving the understanding of the physiology of ankle moment and power generation. (via Semantic Scholar)
Source: Web Of Science
Added: April 20, 2020

2018 journal article

Association between kinesiophobia and walking gait characteristics in physically active individuals with anterior cruciate ligament reconstruction

GAIT & POSTURE, 64, 220–225.

By: B. Luc-Harkey*, J. Franz n, E. Losina* & B. Pietrosimone*

author keywords: Ground reaction force; Knee extension moment; Knee flexion excursion; Limb symmetry index; Tampa Scale for Kinesiophobia
MeSH headings : Adolescent; Adult; Anterior Cruciate Ligament Injuries / psychology; Anterior Cruciate Ligament Injuries / surgery; Anterior Cruciate Ligament Reconstruction / adverse effects; Anterior Cruciate Ligament Reconstruction / psychology; Biomechanical Phenomena; Cross-Sectional Studies; Female; Gait / physiology; Humans; Kinetics; Knee Joint / physiopathology; Knee Joint / surgery; Lower Extremity / physiopathology; Male; Phobia, Social / epidemiology; Phobia, Social / etiology; Range of Motion, Articular / physiology; Walking / physiology; Walking / psychology; Walking Speed / physiology; Young Adult
TL;DR: Data do not support that kinesiophobia is a critical factor contributing to walking gait characteristics in physically active individuals with ACLR. (via Semantic Scholar)
UN Sustainable Development Goal Categories
1. No Poverty (OpenAlex)
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2018 journal article

Do triceps surae muscle dynamics govern non-uniform Achilles tendon deformations?

PeerJ, 6.

By: W. Clark & J. Franz

Source: NC State University Libraries
Added: August 6, 2018

2018 journal article

Does local dynamic stability during unperturbed walking predict the response to balance perturbations? An examination across age and falls history

GAIT & POSTURE, 62, 80–85.

By: M. Qiao n, K. Truong* & J. Franz n

author keywords: Balance; Elderly; Lyapunov; Stability
MeSH headings : Accidental Falls / statistics & numerical data; Adult; Aged; Female; Humans; Locomotion / physiology; Male; Middle Aged; Postural Balance / physiology; Walking / physiology; Young Adult
TL;DR: Predicting the response to balance perturbations in older fallers, at least that measured using local dynamic stability, likely requires measuring that response directly, and evidence is found that optical flow perturbation of sufficient amplitude appear capable of revealing independent effects of aging and falls history that are not otherwise apparent during normal, unperturbed walking. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2018 journal article

The Functional Utilization of Propulsive Capacity During Human Walking

JOURNAL OF APPLIED BIOMECHANICS, 34(6), 474–482.

By: K. Conway n, R. Bissette n & J. Franz n

author keywords: impeding forces; biomechanics; gait; elderly; push-off
UN Sustainable Development Goal Categories
10. Reduced Inequalities (OpenAlex)
Source: Web Of Science
Added: December 31, 2018

2018 journal article

The effects of cognitive load and optical flow on antagonist leg muscle coactivation during walking for young and older adults

JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY, 44, 8–14.

author keywords: Aging; Gait; EMG; Muscle coactivation; Visual feedback; Dual task
MeSH headings : Adult; Aged; Aging / physiology; Cognition; Gait; Humans; Muscle Contraction; Muscle, Skeletal / physiology; Optic Flow
TL;DR: It is found that antagonist coactivation increased with aging, independent of condition, and only in the presence of optical flow perturbations did the older adults increase their antagonist co activation. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: February 4, 2019

2017 journal article

Do kinematic metrics of walking balance adapt to perturbed optical flow?

HUMAN MOVEMENT SCIENCE, 54, 34–40.

By: J. Thompson n & J. Franz n

author keywords: Sensorimotor; Virtual reality; Gait; Vision; Visual feedback
MeSH headings : Adaptation, Physiological; Adult; Biomechanical Phenomena; Exercise Test; Female; Foot / physiology; Gait; Humans; Imaging, Three-Dimensional; Lower Extremity; Male; Motion; Postural Balance; Vision, Ocular / physiology; Visual Perception / physiology; Walking; Young Adult
TL;DR: Investigating the propensity for visuomotor adaptation in walking balance control using prolonged exposure to optical flow perturbations suggests that subjects progressively shifted from a general anticipatory balance control strategy to a reactive, task-specific strategy using step-to-step adjustments. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2017 journal article

Does dynamic stability govern propulsive force generation in human walking?

ROYAL SOCIETY OPEN SCIENCE, 4(11).

By: M. Browne* & J. Franz*

author keywords: variability; push-off; balance; walking speed; biofeedback; ageing
TL;DR: It is found that young adults adopt an FP at their preferred walking speed that maximizes dynamic stability, and the onset of a diminished push-off in old age may independently contribute to poorer balance control and precipitate slower walking speeds. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2017 journal article

It's positive to be negative: Achilles tendon work loops during human locomotion

PLOS ONE, 12(7).

By: K. Zelik* & J. Franz n

MeSH headings : Achilles Tendon / physiology; Adolescent; Adult; Humans; Locomotion; Young Adult
TL;DR: The objective was to compute tendon work loops and hysteresis losses using these two Direct tendon kinematics estimates during human walking and found that Direct estimates generally resulted in negative work loops, suggesting that Direct approaches provide more plausible estimates than the Indirect approach, and may be preferable for understanding tendon energy storage and return. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2017 journal article

Neuroimaging of Human Balance Control: A Systematic Review

Frontiers in Human Neuroscience, 11.

By: E. Wittenberg n, J. Thompson n, C. Nam n & J. Franz n

author keywords: static and dynamic balance control; temporal and spatial dynamics of brain activation; mechanical perturbation; sensory degradation; susceptibility to cognitive dual tasks; movement artifacts
TL;DR: This review examined 83 articles using neuroimaging modalities to investigate the neural correlates underlying static and dynamic human balance control to provide evidence to support an increase in brain activation in balance control tasks, regardless of mechanical, cognitive, or sensory challenges. (via Semantic Scholar)
Sources: Web Of Science, Crossref, NC State University Libraries
Added: August 6, 2018

2017 journal article

The Neuromuscular Origins of Kinematic Variability during Perturbed Walking

SCIENTIFIC REPORTS, 7.

By: H. Stokes n, J. Thompson n & J. Franz n

MeSH headings : Adult; Biomechanical Phenomena; Female; Humans; Male; Muscle Contraction; Muscle, Skeletal / physiology; Postural Balance; Walking / physiology
TL;DR: It is found that perturbations significantly increased step width, decreased step length, and elicited larger trunk sway compared to normal walking, and perturbation-induced effects on the corresponding variabilities of these measurements were much more profound. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2017 journal article

The effects of Achilles tendon compliance on triceps surae mechanics and energetics in walking

JOURNAL OF BIOMECHANICS, 60, 227–231.

By: M. Orselli*, J. Franz n & D. Thelen*

author keywords: Plantarflexor; Musculoskeletal modeling; Forward dynamics; Mechanical power; Metabolic energy
MeSH headings : Achilles Tendon / physiology; Adult; Biomechanical Phenomena; Humans; Male; Muscle, Skeletal / physiology; Walking / physiology
TL;DR: GAS muscle-tendon mechanics and energetics were significantly more sensitive to changes in tendon compliance than were those for SOL, and GAS was not able to return stored tendon energy during push-off as effectively as SOL, particularly for larger values of tendon compliance. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2017 journal article

The independent effects of speed and propulsive force on joint power generation in walking

JOURNAL OF BIOMECHANICS, 55, 48–55.

By: M. Browne n & J. Franz n

author keywords: Plantarflexor; Push-off; Aging; Gait; Biofeedback
MeSH headings : Adult; Aging / physiology; Biomechanical Phenomena; Exercise Test; Female; Humans; Joints / physiology; Knee Joint / physiology; Male; Mechanical Phenomena; Muscle, Skeletal / physiology; Walking Speed / physiology; Young Adult
TL;DR: Visual biofeedback based on real-time FP measurements is used to decouple and investigate the interaction between joint-level coordination, whole-body FP, and walking speed in the aging population and naturally emergent joint- and limb-level biomechanical changes resemble those due to aging. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2016 journal article

Imaging and simulation of Achilles tendon dynamics: Implications for walking performance in the elderly

JOURNAL OF BIOMECHANICS, 49(9), 1403–1410.

By: J. Franz n & D. Thelen*

author keywords: Ultrasound; Plantarflexor; Aging; Musculoskeletal modeling; Simulation; Biomechanics
MeSH headings : Achilles Tendon / diagnostic imaging; Achilles Tendon / physiology; Aging / physiology; Biomechanical Phenomena; Humans; Models, Biological; Molecular Imaging / methods; Walking / physiology
TL;DR: Experimental evidence reveals that older tendons exhibit smaller differences in tissue deformations than young adults between regions of the AT presumed to arise from the gastrocnemius and soleus muscles, which could have implications for the mechanical independence of the triceps surae muscles. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2016 review

The Age-Associated Reduction in Propulsive Power Generation in Walking

[Review of ]. EXERCISE AND SPORT SCIENCES REVIEWS, 44(4), 129–136.

By: J. Franz n

author keywords: plantarflexor; biomechanics; gait; elderly; ankle; geriatrics; ultrasound
MeSH headings : Aged; Aged, 80 and over; Aging / physiology; Biomechanical Phenomena; Gait / physiology; Humans; Muscle Weakness / physiopathology; Muscle, Skeletal / physiology; Postural Balance / physiology; Range of Motion, Articular / physiology; Tendons / physiology; Walking / physiology
TL;DR: The hypothesis that declines in force or power generating capacity of propulsive leg muscles cannot fully explain the age-related reduction in propulsive power generation during walking is examined. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2016 journal article

Variation in the human Achilles tendon moment arm during walking

COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING, 20(2), 201–205.

By: K. Rasske*, D. Thelen* & J. Franz n

author keywords: Gait; plantarflexors; triceps surae; ultrasound; musculoskeletal model
MeSH headings : Achilles Tendon / physiology; Adult; Ankle / physiology; Ankle Joint / physiology; Ankle Joint / ultrastructure; Arm / physiology; Cross-Sectional Studies; Female; Humans; Longitudinal Studies; Male; Models, Biological; Muscle, Skeletal / physiology; Ultrasonography; Walking / physiology; Young Adult
TL;DR: This work coupled motion analysis and ultrasound imaging to characterize AT moment arms during walking in 10 subjects and found that muscle loading during push-off amplified the AT moment arm by 10% relative to heel strike. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2016 journal article

Visuomotor Entrainment and the Frequency-Dependent Response of Walking Balance to Perturbations

IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING, 25(8), 1135–1142.

author keywords: Gait; posture; sensorimotor; stability; virtual reality
TL;DR: It is concluded that visuomotor entrainment is a robust and naturally emerging phenomenon during human walking, involving coordinated and frequency-dependent adjustments in trunk sway and foot placement to maintain balance at the whole-body level. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

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