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Intralimb dynamics simplify reactive control strategies during locomotion
J J Eng1, D A Winter, A E Patla
1School of Rehabilitation Sciences, University of British Columbia, Vancouver, Canada.
Journal of Biomechanics
|June 1, 1997
Summary
The nervous system uses passive dynamics for reactive locomotion control, even during unexpected perturbations. This strategy simplifies neural control, as seen in hip and knee joint responses during walking adjustments.
Area of Science:
- Biomechanics
- Neuroscience
- Locomotion analysis
Background:
- Passive dynamics minimize energy costs and neural complexity in normal locomotion.
- Reactive locomotion control prioritizes rapid responses over energy efficiency during perturbations like trips or slips.
Purpose of the Study:
- To investigate whether the nervous system utilizes passive dynamics during reactive locomotion control.
- To understand the role of passive dynamics in response to unexpected mechanical perturbations during walking.
Main Methods:
- Applied unexpected mechanical perturbations to the foot during early and late swing phases of walking.
- Utilized inverse dynamics analysis on video data to calculate joint moments and power.
- Partitioned joint moments into active and passive components.
Main Results:
- The nervous system continued to utilize passive dynamics during reactive control.
- Active control of the knee joint facilitated proximal hip and distal ankle flexor actions after an early swing perturbation.
- A neuromuscular constraint was observed during late swing perturbations, with invariant hip extensor/knee flexor moment magnitude.
Conclusions:
- Passive dynamics are employed by the nervous system during reactive locomotion, suggesting a role in simplifying neural control.
- Minimizing mechanical energy cost is not the primary determinant during reactive walking adjustments.
- Intralimb dynamics observed during perturbations may reduce the complexity of active neural control.