The effect of stride length on lower extremity joint kinetics at various gait speeds

Robert L. McGrath, Melissa L. Ziegler, Margaret Pires-Fernandes, Brian Knarr, Jill S. Higginson, Fabrizio Sergi

Research output: Contribution to journalArticle

Abstract

Robot-assisted training is a promising tool under development for improving walking function based on repetitive goal-oriented task practice. The challenges in developing the controllers for gait training devices that promote desired changes in gait is complicated by the limited understanding of the human response to robotic input. A possible method of controller formulation can be based on the principle of bio-inspiration, where a robot is controlled to apply the change in joint moment applied by human subjects when they achieve a gait feature of interest. However, it is currently unclear how lower extremity joint moments are modulated by even basic gait spatio-temporal parameters. In this study, we investigated how sagittal plane joint moments are affected by a factorial modulation of two important gait parameters: gait speed and stride length. We present the findings obtained from 20 healthy control subjects walking at various treadmill-imposed speeds and instructed to modulate stride length utilizing real-time visual feedback. Implementing a continuum analysis of inverse-dynamics derived joint moment profiles, we extracted the effects of gait speed and stride length on joint moment throughout the gait cycle. Moreover, we utilized a torque pulse approximation analysis to determine the timing and amplitude of torque pulses that approximate the difference in joint moment profiles between stride length conditions, at all gait speed conditions. Our results show that gait speed has a significant effect on the moment profiles in all joints considered, while stride length has more localized effects, with the main effect observed on the knee moment during stance, and smaller effects observed for the hip joint moment during swing and ankle moment during the loading response. Moreover, our study demonstrated that trailing limb angle, a parameter of interest in programs targeting propulsion at push-off, was significantly correlated with stride length. As such, our study has generated assistance strategies based on pulses of torque suitable for implementation via a wearable exoskeleton with the objective of modulating stride length, and other correlated variables such as trailing limb angle.

Original languageEnglish (US)
Article numbere0200862
JournalPloS one
Volume14
Issue number2
DOIs
StatePublished - Feb 1 2019

Fingerprint

gait
Lower Extremity
Gait
Joints
kinetics
Kinetics
Torque
torque
Robots
Walking
Exercise equipment
Controllers
robots
Extremities
controllers
limbs (animal)
walking
Propulsion
Sensory Feedback
Robotics

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

McGrath, R. L., Ziegler, M. L., Pires-Fernandes, M., Knarr, B., Higginson, J. S., & Sergi, F. (2019). The effect of stride length on lower extremity joint kinetics at various gait speeds. PloS one, 14(2), [e0200862]. https://doi.org/10.1371/journal.pone.0200862

The effect of stride length on lower extremity joint kinetics at various gait speeds. / McGrath, Robert L.; Ziegler, Melissa L.; Pires-Fernandes, Margaret; Knarr, Brian; Higginson, Jill S.; Sergi, Fabrizio.

In: PloS one, Vol. 14, No. 2, e0200862, 01.02.2019.

Research output: Contribution to journalArticle

McGrath, RL, Ziegler, ML, Pires-Fernandes, M, Knarr, B, Higginson, JS & Sergi, F 2019, 'The effect of stride length on lower extremity joint kinetics at various gait speeds', PloS one, vol. 14, no. 2, e0200862. https://doi.org/10.1371/journal.pone.0200862
McGrath RL, Ziegler ML, Pires-Fernandes M, Knarr B, Higginson JS, Sergi F. The effect of stride length on lower extremity joint kinetics at various gait speeds. PloS one. 2019 Feb 1;14(2). e0200862. https://doi.org/10.1371/journal.pone.0200862
McGrath, Robert L. ; Ziegler, Melissa L. ; Pires-Fernandes, Margaret ; Knarr, Brian ; Higginson, Jill S. ; Sergi, Fabrizio. / The effect of stride length on lower extremity joint kinetics at various gait speeds. In: PloS one. 2019 ; Vol. 14, No. 2.
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