Gregory Stephen Sawicki
Works (39)
Updated: August 26th, 2023 21:18
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
doi.org (publisher)
Source: Web Of Science
Added: June 19, 2023
2023 journal article
The influence of induced gait asymmetry on joint reaction forces
JOURNAL OF BIOMECHANICS, 153.
author keywords: Musculoskeletal modeling; Simulation; Joint restriction; Joint reaction force
MeSH headings : Humans; Gait / physiology; Knee Joint / physiology; Lower Extremity / physiology; Knee; Walking / physiology; Biomechanical Phenomena
Source: Web Of Science
Added: June 12, 2023
2021 journal article
Isolating the energetic and mechanical consequences of imposed reductions in ankle and knee flexion during gait
JOURNAL OF NEUROENGINEERING AND REHABILITATION, 18(1).
author keywords: Biomechanics; Gait; Ankle; Knee; Metabolic cost
MeSH headings : Adaptation, Physiological / physiology; Adult; Ankle; Ankle Joint / physiology; Biomechanical Phenomena; Female; Gait / physiology; Humans; Knee Joint / physiology; Male; Range of Motion, Articular / physiology; Walking; Young Adult
Source: Web Of Science
Added: March 15, 2021
2021 journal article
Neuromechanics and Energetics of Walking With an Ankle Exoskeleton Using Neuromuscular-Model Based Control: A Parameter Study
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY, 9.
author keywords: powered ankle exoskeleton; neuromuscular model; locomotion neuromechanics; human walking; muscle electromyography; metabolic energy cost; plantarflexor muscle-tendon mechanics
Source: Web Of Science
Added: May 10, 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
Source: Web Of Science
Added: August 2, 2021
2021 journal article
Reduced joint motion supersedes asymmetry in explaining increased metabolic demand during walking with mechanical restriction
JOURNAL OF BIOMECHANICS, 126.
author keywords: Gait; Asymmetry; Metabolic cost; Degrees of freedom; Joint restriction
MeSH headings : Ankle Joint; Biomechanical Phenomena; Gait; Humans; Knee Joint; Walking
Source: Web Of Science
Added: October 12, 2021
2020 journal article
Impact of elastic ankle exoskeleton stiffness on neuromechanics and energetics of human walking across multiple speeds
JOURNAL OF NEUROENGINEERING AND REHABILITATION, 17(1).
author keywords: Locomotion; Wearable robotics; Plantarflexors; Spring-loaded; Lower-limb joints; Biomechanics; Metabolic cost; Compliant
MeSH headings : Adult; Ankle Joint / physiology; Biomechanical Phenomena / physiology; Energy Metabolism / physiology; Exoskeleton Device; Female; Humans; Male; Muscle, Skeletal / physiology; Walking / physiology
Source: Web Of Science
Added: July 13, 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
Source: Web Of Science
Added: August 17, 2020
2019 journal article
Development of a Novel Gait Analysis Tool Measuring Center of Pressure for Evaluation of Canine Chronic Thoracolumbar Spinal Cord Injury
Journal of Neurotrauma, 36(21), 3018–3025.
author keywords: center of pressure; chronic spinal cord injury; dogs; locomotion; postural control
MeSH headings : Animals; Dogs; Gait Analysis / instrumentation; Lumbar Vertebrae; Postural Balance / physiology; Spinal Cord Injuries / veterinary; Thoracic Vertebrae
Sources: Web Of Science, ORCID, Crossref
Added: June 24, 2019
2019 journal article
Mechanics and energetics of post-stroke walking aided by a powered ankle exoskeleton with speed-adaptive myoelectric control
JOURNAL OF NEUROENGINEERING AND REHABILITATION, 16.
author keywords: Ankle mechanics; Exoskeleton; Trailing limb angle; Propulsion; Myoelectric control; Electromyography; Metabolic cost; Hemiparesis; Stroke rehabilitation; Walking
MeSH headings : Adult; Ankle Joint / physiology; Biomechanical Phenomena / physiology; Electromyography / methods; Exoskeleton Device; Female; Humans; Male; Middle Aged; Stroke Rehabilitation / instrumentation; Walking / physiology; Walking Speed / physiology
Source: Web Of Science
Added: June 4, 2019
2017 journal article
A benchtop biorobotic platform for in vitro observation of muscle-tendon dynamics with parallel mechanical assistance from an elastic exoskeleton
JOURNAL OF BIOMECHANICS, 57, 8–17.
author keywords: Biomechanics; Elastic exoskeleton; Muscle-tendon mechanics; Unconstrained work loops; Biorobotics
MeSH headings : Animals; Biomechanical Phenomena; Elasticity; Gravitation; Locomotion / physiology; Muscle, Skeletal / physiology; Ranidae; Robotics / instrumentation; Tendons / physiology
Source: Web Of Science
Added: August 6, 2018
2017 article
An In Vitro Approach for Directly Observing Muscle-Tendon Dynamics with Parallel Elastic Mechanical Assistance
CONVERGING CLINICAL AND ENGINEERING RESEARCH ON NEUROREHABILITATION II, VOLS 1 AND 2, Vol. 15, pp. 643–647.
Source: Web Of Science
Added: August 6, 2018
2017 journal article
Quantifying center of pressure variability in chondrodystrophoid dogs
The Veterinary Journal, 226, 26–31.
author keywords: Locomotion; Kinematics; Center of gravity
MeSH headings : Animals; Biomechanical Phenomena; Cartilage / growth & development; Dog Diseases / physiopathology; Dogs / anatomy & histology; Dogs / physiology; Gait; Species Specificity; Spinal Cord Injuries / physiopathology; Spinal Cord Injuries / veterinary
Sources: Web Of Science, Crossref, ORCID
Added: August 6, 2018
2017 journal article
The springs of time-limited bullfrog jumps and slow-preparation grasshopper leaps are tuned to their muscle dynamics
Integrative and Comparative Biology, 57, E390–390.
Source: NC State University Libraries
Added: August 6, 2018
2016 journal article
A Simple Model to Estimate Plantarflexor Muscle-Tendon Mechanics and Energetics During Walking With Elastic Ankle Exoskeletons
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, 63(5), 914–923.
author keywords: Ankle exoskeleton; computer simulation; elastic energy storage; energetics; Hill-type muscle model; human walking; metabolic cost; muscle-tendon dynamics; plantarflexors (PF)
MeSH headings : Ankle / physiology; Biomechanical Phenomena / physiology; Exoskeleton Device; Humans; Models, Biological; Muscle, Skeletal / physiology; Tendons / physiology; Walking / physiology
Source: Web Of Science
Added: August 6, 2018
2016 journal article
A cyber expert system for auto-tuning powered prosthesis impedance control parameters
Annals of Biomedical Engineering, 44(5), 1613–1624.
MeSH headings : Ankle Joint; Electric Impedance; Female; Gait; Humans; Knee Joint; Knee Prosthesis; Male; Walking
Sources: NC State University Libraries, ORCID
Added: August 6, 2018
2016 journal article
Adding Stiffness to the Foot Modulates Soleus Force-Velocity Behaviour during Human Walking
SCIENTIFIC REPORTS, 6.
MeSH headings : Ankle / physiology; Biomechanical Phenomena / physiology; Foot / physiology; Gait / physiology; Humans; Muscle, Skeletal / physiology; Walking / physiology
Source: Web Of Science
Added: August 6, 2018
2016 journal article
Modeling age-related changes in muscle-tendon dynamics during cyclical contractions in the rat gastrocnemius
JOURNAL OF APPLIED PHYSIOLOGY, 121(4), 1004–1012.
author keywords: aging; elastic energy; cost of locomotion; fibrosis; ankle joint work
MeSH headings : Aging / physiology; Animals; Computer Simulation; Elastic Modulus / physiology; Male; Models, Biological; Muscle, Skeletal / physiology; Oscillometry; Rats; Rats, Inbred F344; Stress, Mechanical; Tendons / physiology; Tensile Strength / physiology
Source: Web Of Science
Added: August 6, 2018
2016 journal article
Muscle-spring dynamics in time-limited, elastic movements
author keywords: muscle-spring interaction; elastic energy storage; muscle dynamics; time-limited loading; fixed-end contraction; spring stiffness
MeSH headings : Animals; Biomechanical Phenomena; Grasshoppers / physiology; Movement; Muscle Contraction; Muscle, Skeletal / physiology; Ranidae / physiology; Tendons / physiology
Source: Web Of Science
Added: August 6, 2018
2015 journal article
A neuromechanics-based powered ankle exoskeleton to assist walking post-stroke: a feasibility study
JOURNAL OF NEUROENGINEERING AND REHABILITATION, 12.
author keywords: Stroke; Exoskeleton; Gait; Rehabilitation; Ankle
MeSH headings : Aged; Aged, 80 and over; Ankle; Ankle Joint; Artificial Limbs; Biomechanical Phenomena; Bionics; Electromyography; Energy Metabolism; Feasibility Studies; Female; Foot; Humans; Male; Mechanical Phenomena; Middle Aged; Paresis / rehabilitation; Prosthesis Design; Robotics; Stroke Rehabilitation; Walking
Source: Web Of Science
Added: August 6, 2018
2015 journal article
Individual limb mechanical analysis of gait following stroke
JOURNAL OF BIOMECHANICS, 48(6), 984–989.
author keywords: Stroke; Hemiplegia; Rehabilitation; Gait; Mechanics
MeSH headings : Aged; Chronic Disease; Exercise Test; Extremities / physiopathology; Female; Gait / physiology; Humans; Male; Middle Aged; Stroke / physiopathology; Walking / physiology
Source: Web Of Science
Added: August 6, 2018
2015 article
More is not always better: Modeling the effects of elastic exoskeleton compliance on underlying ankle muscle-tendon dynamics (vol 9, 046018, 2014)
Bioinspiration & Biomimetics, Vol. 10.
Source: NC State University Libraries
Added: August 6, 2018
2015 journal article
Power amplification in an isolated muscle-tendon unit is load dependent
JOURNAL OF EXPERIMENTAL BIOLOGY, 218(22), 3700–3709.
author keywords: Muscle-tendon system; Elastic energy; Power amplification; Catch mechanism; Acceleration; Jumping
MeSH headings : Animals; Biomechanical Phenomena; Elasticity; Energy Transfer; Locomotion / physiology; Muscle Contraction; Muscle, Skeletal / physiology; Rana catesbeiana / physiology; Tendons / physiology
Source: Web Of Science
Added: August 6, 2018
2015 journal article
Reducing the energy cost of human walking using an unpowered exoskeleton
NATURE, 522(7555), 212-+.
MeSH headings : Ankle / physiology; Artificial Limbs; Bionics / instrumentation; Bionics / methods; Energy Metabolism; Female; Foot / physiology; Humans; Leg / physiology; Male; Muscle, Skeletal / physiology; Walking / physiology; Young Adult
Source: Web Of Science
Added: August 6, 2018
2015 journal article
Revisiting the mechanics and energetics of walking in individuals with chronic hemiparesis following stroke: from individual limbs to lower limb joints
JOURNAL OF NEUROENGINEERING AND REHABILITATION, 12.
author keywords: Locomotion; Individual limbs method; Mechanical power; Metabolic power; Joint power; Inverse dynamics; Stroke
MeSH headings : Aged; Ankle Joint / physiopathology; Biomechanical Phenomena; Calorimetry, Indirect; Chronic Disease; Energy Metabolism; Female; Gait; Hip Joint / physiopathology; Humans; Joints / physiopathology; Knee Joint / physiopathology; Locomotion; Lower Extremity / physiopathology; Male; Mechanical Phenomena; Middle Aged; Paresis / etiology; Paresis / physiopathology; Self-Help Devices; Stroke / complications; Stroke / physiopathology
Source: Web Of Science
Added: August 6, 2018
2015 journal article
Six degree-of-freedom analysis of hip, knee, ankle and foot provides updated understanding of biomechanical work during human walking
JOURNAL OF EXPERIMENTAL BIOLOGY, 218(6), 876–886.
author keywords: Biomechanics; Foot work; Gait analysis; Inverse dynamics; Joint work; Mechanical work
MeSH headings : Adult; Ankle Joint / physiology; Biomechanical Phenomena; Female; Foot / physiology; Hip Joint / physiology; Humans; Knee Joint / physiology; Male; Walking; Young Adult
Source: Web Of Science
Added: August 6, 2018
2015 journal article
Timing matters: tuning the mechanics of a muscle-tendon unit by adjusting stimulation phase during cyclic contractions
JOURNAL OF EXPERIMENTAL BIOLOGY, 218(19), 3150–3159.
author keywords: Muscle-tendon interaction; Muscle stimulation phase; Work loop; Elastic energy storage and return; Terrestrial locomotion
MeSH headings : Animals; Biomechanical Phenomena; Locomotion / physiology; Muscle Contraction / physiology; Muscle, Skeletal / physiology; Rana catesbeiana / physiology; Tendons / physiology
Source: Web Of Science
Added: August 6, 2018
2014 journal article
Exploiting elasticity: Modeling the influence of neural control on mechanics and energetics of ankle muscle-tendons during human hopping
JOURNAL OF THEORETICAL BIOLOGY, 353, 121–132.
author keywords: Plantarflexors; Locomotion; Muscle mechanics; Metabolic cost; Elastic mechanisms
MeSH headings : Ankle / physiology; Basal Metabolism; Biomechanical Phenomena; Elasticity; Energy Metabolism / physiology; Humans; Models, Biological; Motor Activity / physiology; Muscle Contraction / physiology; Muscle, Skeletal / physiology; Nervous System Physiological Phenomena; Tendons / physiology
Source: Web Of Science
Added: August 6, 2018
2014 journal article
More is not always better: modeling the effects of elastic exoskeleton compliance on underlying ankle muscle-tendon dynamics
BIOINSPIRATION & BIOMIMETICS, 9(4).
author keywords: elastic ankle exoskeleton; muscle-tendon interaction; mechanics; energetics; hopping; ultrasound
MeSH headings : Biomimetics / instrumentation; Computer Simulation; Computer-Aided Design; Elastic Modulus / physiology; Equipment Design; Equipment Failure Analysis; Humans; Man-Machine Systems; Models, Biological; Movement / physiology; Muscle Contraction / physiology; Muscle, Skeletal / physiology; Orthotic Devices; Robotics / instrumentation; Tendons / physiology
Source: Web Of Science
Added: August 6, 2018
2014 journal article
Musculoskeletal modelling deconstructs the paradoxical effects of elastic ankle exoskeletons on plantar-flexor mechanics and energetics during hopping
JOURNAL OF EXPERIMENTAL BIOLOGY, 217(22), 4018–4028.
author keywords: Assistive robotics; Dynamics simulation; Energetics; Locomotion; Metabolic energy; Muscle mechanics
MeSH headings : Adult; Ankle Joint / physiology; Biomechanical Phenomena; Electromyography; Energy Metabolism / physiology; Gait / physiology; Humans; Male; Models, Theoretical; Muscle, Skeletal / physiology; Orthotic Devices; Tendons / physiology
Source: Web Of Science
Added: August 6, 2018
2013 journal article
Elastic ankle exoskeletons reduce soleus muscle force but not work in human hopping
JOURNAL OF APPLIED PHYSIOLOGY, 115(5), 579–585.
author keywords: ultrasound; fascicle; tendon; metabolic power; plantar flexors
MeSH headings : Adult; Ankle / physiology; Ankle Joint / physiology; Electromyography / methods; Energy Metabolism / physiology; Humans; Leg / physiopathology; Male; Muscle, Skeletal / physiology; Tendons / physiology; Walking / physiology
Source: Web Of Science
Added: August 6, 2018
2013 journal article
Estimation of Quasi-Stiffness and Propulsive Work of the Human Ankle in the Stance Phase of Walking
PLOS ONE, 8(3).
MeSH headings : Adult; Ankle / physiology; Ankle Joint / physiology; Biomechanical Phenomena; Female; Gait; Humans; Leg / physiology; Male; Regression Analysis; Stress, Mechanical; Walking
Source: Web Of Science
Added: August 6, 2018
2013 journal article
Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking
PLOS ONE, 8(12).
MeSH headings : Adult; Biomechanical Phenomena; Female; Gait / physiology; Hip / anatomy & histology; Hip / physiology; Hip Joint / anatomy & histology; Hip Joint / physiology; Humans; Male; Models, Statistical; Orthotic Devices; Range of Motion, Articular / physiology; Regression Analysis; Walking / physiology
Source: Web Of Science
Added: August 6, 2018
2013 journal article
Estimation of Quasi-Stiffness of the Human Knee in the Stance Phase of Walking
PLOS ONE, 8(3).
MeSH headings : Biomechanical Phenomena; Gait / physiology; Humans; Knee Joint / physiology; Locomotion / physiology; Models, Theoretical; Walking / physiology
Source: Web Of Science
Added: August 6, 2018
2012 journal article
Elastic recoil can either amplify or attenuate muscle-tendon power, depending on inertial vs. fluid dynamic loading
JOURNAL OF THEORETICAL BIOLOGY, 313, 68–78.
author keywords: Muscle power amplification; Gearing; Mechanical advantage; Mathematical model; Inertial and viscous loads
MeSH headings : Animals; Biomechanical Phenomena / physiology; Computer Simulation; Elasticity; Hydrodynamics; Models, Biological; Muscle Contraction / physiology; Muscle, Skeletal / physiology; Tendons / physiology; Xenopus laevis
Source: Web Of Science
Added: August 6, 2018
2012 journal article
Human medial gastrocnemius force-velocity behavior shifts with locomotion speed and gait
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 109(3), 977–982.
author keywords: muscle mechanics; biomechanics; preferred transition speed
MeSH headings : Adult; Behavior / physiology; Biomechanical Phenomena / physiology; Elasticity / physiology; Female; Gait / physiology; Humans; Locomotion / physiology; Male; Muscle, Skeletal / anatomy & histology; Muscle, Skeletal / physiology; Walking / physiology; Young Adult
Source: Web Of Science
Added: August 6, 2018
2012 journal article
The influence of a unilateral fixed ankle on metabolic and mechanical demands during walking in unimpaired young adults
JOURNAL OF BIOMECHANICS, 45(14), 2405–2410.
author keywords: Gait; Biomechanics; Metabolic cost; Ankle
MeSH headings : Adult; Ankle; Energy Metabolism; Female; Hip; Humans; Male; Muscle Strength; Orthopedic Fixation Devices; Walking
Source: Web Of Science
Added: August 6, 2018
2012 journal article
The mechanics and energetics of human walking and running: a joint level perspective
JOURNAL OF THE ROYAL SOCIETY INTERFACE, 9(66), 110–118.
author keywords: locomotion; speed; mechanical power; efficiency; cost of transport
MeSH headings : Adult; Ankle Joint / physiology; Biomechanical Phenomena; Calorimetry, Indirect; Energy Metabolism; Female; Gait; Hip Joint / physiology; Humans; Knee Joint / physiology; Male; Running; Walking
Source: Web Of Science
Added: August 6, 2018
2011 conference paper
Influence of parallel spring-loaded exoskeleton on ankle muscle-tendon dynamics during simulated human hopping
2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 583–586.
MeSH headings : Achilles Tendon / physiology; Ankle Joint / physiology; Computer Simulation; Humans; Locomotion / physiology; Models, Biological; Muscle Contraction / physiology; Muscle, Skeletal / physiology; Orthotic Devices; Robotics / methods; Therapy, Computer-Assisted / methods
Source: NC State University Libraries
Added: August 6, 2018
