Gregory Sawicki

Boyer, K. A., Hayes, K. L., Umberger, B. R., Adamczyk, P. G., Bean, J. F., Brach, J. S., … Kent, J. A. (2023). [Review of Age-related changes in gait biomechanics and their impact on the metabolic cost of walking: Report from a National Institute on Aging workshop]. EXPERIMENTAL GERONTOLOGY, 173. https://doi.org/10.1016/j.exger.2023.112102

McCain, E. M., Dalman, M. J., Berno, M. E., Libera, T. L., Lewek, M. D., Sawicki, G. S., & Saul, K. R. (2023). The influence of induced gait asymmetry on joint reaction forces. JOURNAL OF BIOMECHANICS, 153. https://doi.org/10.1016/j.jbiomech.2023.111581

McCain, E. M., Libera, T. L., Berno, M. E., Sawicki, G. S., Saul, K. R., & Lewek, M. D. (2021). Isolating the energetic and mechanical consequences of imposed reductions in ankle and knee flexion during gait. JOURNAL OF NEUROENGINEERING AND REHABILITATION, 18(1). https://doi.org/10.1186/s12984-021-00812-8

Shafer, B. A., Philius, S. A., Nuckols, R. W., McCall, J., Young, A. J., & Sawicki, G. S. (2021). Neuromechanics and Energetics of Walking With an Ankle Exoskeleton Using Neuromuscular-Model Based Control: A Parameter Study. FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY, 9. https://doi.org/10.3389/fbioe.2021.615358

Krupenevich, R. L., Beck, O. N., Sawicki, G. S., & Franz, J. R. (2021, July 16). Reduced Achilles Tendon Stiffness Disrupts Calf Muscle Neuromechanics in Elderly Gait. GERONTOLOGY. https://doi.org/10.1159/000516910

McCain, E. M., Berno, M. E., Libera, T. L., Lewek, M. D., Sawicki, G. S., & Saul, K. R. (2021). Reduced joint motion supersedes asymmetry in explaining increased metabolic demand during walking with mechanical restriction. JOURNAL OF BIOMECHANICS, 126. https://doi.org/10.1016/j.jbiomech.2021.110621

Nuckols, R. W., & Sawicki, G. S. (2020). Impact of elastic ankle exoskeleton stiffness on neuromechanics and energetics of human walking across multiple speeds. JOURNAL OF NEUROENGINEERING AND REHABILITATION, 17(1). https://doi.org/10.1186/s12984-020-00703-4

Krupenevich, R. L., Clark, W. H., Sawicki, G. S., & Franz, J. R. (2020). Older Adults Overcome Reduced Triceps Surae Structural Stiffness to Preserve Ankle Joint Quasi-Stiffness During Walking. JOURNAL OF APPLIED BIOMECHANICS, 36(4), 209–216. https://doi.org/10.1123/jab.2019-0340

Lewis, M. J., Williams, K. D., Langley, T., Jarvis, L. M., Sawicki, G. S., & Olby, N. J. (2019). 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. https://doi.org/10.1089/neu.2019.6479

McCain, E. M., Dick, T. J. M., Giest, T. N., Nuckols, R. W., Lewek, M. D., Saul, K. R., & Sawicki, G. S. (2019). Mechanics and energetics of post-stroke walking aided by a powered ankle exoskeleton with speed-adaptive myoelectric control. JOURNAL OF NEUROENGINEERING AND REHABILITATION, 16. https://doi.org/10.1186/s12984-019-0523-y

Robertson, B. D., Vadakkeveedu, S., & Sawicki, G. S. (2017). 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. https://doi.org/10.1016/j.jbiomech.2017.03.009

Sawicki, G. S., & Robertson, B. D. (2017). 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. https://doi.org/10.1007/978-3-319-46669-9_106

Blau, S. R., Davis, L. M., Gorney, A. M., Dohse, C. S., Williams, K. D., Lim, J.-H., … Olby, N. J. (2017). Quantifying center of pressure variability in chondrodystrophoid dogs. The Veterinary Journal, 226, 26–31. https://doi.org/10.1016/j.tvjl.2017.07.001

Rosario, M. V., Sutton, G. P., Patek, S. N., & Sawicki, G. S. (2017). 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.

Sawicki, G. S., & Khan, N. S. (2016). 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. https://doi.org/10.1109/tbme.2015.2491224

Huang, H., Crouch, D. L., Liu, M., Sawicki, G. S., & Wang, D. (2016). A cyber expert system for auto-tuning powered prosthesis impedance control parameters. Annals of Biomedical Engineering, 44(5), 1613–1624. https://doi.org/10.1007/s10439-015-1464-7

Takahashi, K. Z., Gross, M. T., Werkhoven, H., Piazza, S. J., & Sawicki, G. S. (2016). Adding Stiffness to the Foot Modulates Soleus Force-Velocity Behaviour during Human Walking. SCIENTIFIC REPORTS, 6. https://doi.org/10.1038/srep29870

Danos, N., Holt, N. C., Sawicki, G. S., & Azizi, E. (2016). Modeling age-related changes in muscle-tendon dynamics during cyclical contractions in the rat gastrocnemius. JOURNAL OF APPLIED PHYSIOLOGY, 121(4), 1004–1012. https://doi.org/10.1152/japplphysiol.00396.2016

Rosario, M. V., Sutton, G. P., Patek, S. N., & Sawicki, G. S. (2016). Muscle-spring dynamics in time-limited, elastic movements. PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, 283(1838). https://doi.org/10.1098/rspb.2016.1561

Takahashi, K. Z., Lewek, M. D., & Sawicki, G. S. (2015). A neuromechanics-based powered ankle exoskeleton to assist walking post-stroke: a feasibility study. JOURNAL OF NEUROENGINEERING AND REHABILITATION, 12. https://doi.org/10.1186/s12984-015-0015-7

Mahon, C. E., Farris, D. J., Sawicki, G. S., & Lewek, M. D. (2015). Individual limb mechanical analysis of gait following stroke. JOURNAL OF BIOMECHANICS, 48(6), 984–989. https://doi.org/10.1016/j.jbiomech.2015.02.006

Robertson, B. D., Farris, D. J., & Sawicki, G. S. (2015). 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.

Sawicki, G. S., Sheppard, P., & Roberts, T. J. (2015). Power amplification in an isolated muscle-tendon unit is load dependent. JOURNAL OF EXPERIMENTAL BIOLOGY, 218(22), 3700–3709. https://doi.org/10.1242/jeb.126235

Collins, S. H., Wiggin, M. B., & Sawicki, G. S. (2015). Reducing the energy cost of human walking using an unpowered exoskeleton. NATURE, 522(7555), 212-+. https://doi.org/10.1038/nature14288

Farris, D. J., Hampton, A., Lewek, M. D., & Sawicki, G. S. (2015). 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. https://doi.org/10.1186/s12984-015-0012-x

Zelik, K. E., Takahashi, K. Z., & Sawicki, G. S. (2015). 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. https://doi.org/10.1242/jeb.115451

Sawicki, G. S., Robertson, B. D., Azizi, E., & Roberts, T. J. (2015). 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. https://doi.org/10.1242/jeb.121673

Robertson, B. D., & Sawicki, G. S. (2014). 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. https://doi.org/10.1016/j.jtbi.2014.03.010

Robertson, B. D., Farris, D. J., & Sawicki, G. S. (2014). More is not always better: modeling the effects of elastic exoskeleton compliance on underlying ankle muscle-tendon dynamics. BIOINSPIRATION & BIOMIMETICS, 9(4). https://doi.org/10.1088/1748-3182/9/4/046018

Farris, D. J., Hicks, J. L., Delp, S. L., & Sawicki, G. S. (2014). 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. https://doi.org/10.1242/jeb.107656

Farris, D. J., Robertson, B. D., & Sawicki, G. S. (2013). Elastic ankle exoskeletons reduce soleus muscle force but not work in human hopping. JOURNAL OF APPLIED PHYSIOLOGY, 115(5), 579–585. https://doi.org/10.1152/japplphysiol.00253.2013

Shamaei, K., Sawicki, G. S., & Dollar, A. M. (2013). Estimation of Quasi-Stiffness and Propulsive Work of the Human Ankle in the Stance Phase of Walking. PLOS ONE, 8(3). https://doi.org/10.1371/journal.pone.0059935

Shamaei, K., Sawicki, G. S., & Dollar, A. M. (2013). Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking. PLOS ONE, 8(12). https://doi.org/10.1371/journal.pone.0081841

Shamaei, K., Sawicki, G. S., & Dollar, A. M. (2013). Estimation of Quasi-Stiffness of the Human Knee in the Stance Phase of Walking. PLOS ONE, 8(3). https://doi.org/10.1371/journal.pone.0059993

Richards, C. T., & Sawicki, G. S. (2012). Elastic recoil can either amplify or attenuate muscle-tendon power, depending on inertial vs. fluid dynamic loading. JOURNAL OF THEORETICAL BIOLOGY, 313, 68–78. https://doi.org/10.1016/j.jtbi.2012.07.033

Farris, D. J., & Sawicki, G. S. (2012). 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. https://doi.org/10.1073/pnas.1107972109

Wutzke, C. J., Sawicki, G. S., & Lewek, M. D. (2012). 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. https://doi.org/10.1016/j.jbiomech.2012.06.035

Farris, D. J., & Sawicki, G. S. (2012). The mechanics and energetics of human walking and running: a joint level perspective. JOURNAL OF THE ROYAL SOCIETY INTERFACE, 9(66), 110–118. https://doi.org/10.1098/rsif.2011.0182

Robertson, B. D., & Sawicki, G. S. (2011). 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. https://doi.org/10.1109/iembs.2011.6090109