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Control of dynamic stability during gait termination on a slippery surface
A R Oates1, A E Patla, J S Frank
1Kinesiology Department, University of Waterloo, 200 University Ave. W., Waterloo, Ontario N2L 3G1, Canada.
Journal of Neurophysiology
|August 6, 2004
Summary
Stopping gait on slippery surfaces involves unique balance strategies. Unexpected slips reveal how the body adjusts center of mass (COM) control and muscle activity to maintain stability.
Area of Science:
- Biomechanics
- Neuroscience
- Human locomotion
Background:
- Gait termination typically involves controlled deceleration of the whole-body center of mass (COM).
- Three primary strategies exist for successful gait termination: flexor synergy, extensor synergy, and momentum dissipation.
- Unexpected perturbations, such as slips, challenge these normal termination strategies.
Purpose of the Study:
- To investigate the biomechanical and neuromuscular responses to unexpected slips during gait termination.
- To understand how individuals adapt their balance control strategies on a slippery surface.
Main Methods:
- Healthy individuals performed gait termination tasks on a forceplate-equipped slippery surface.
- Kinetic data (forces, center of pressure) and kinematic data (COM movement) were collected.
- Electromyography (EMG) was used to record muscle activity in the lower limbs and back.
Main Results:
- Slippery surface trials showed reduced braking forces and impaired center of pressure (COP) control compared to normal trials.
- Subject COM deviated more horizontally and lowered further during slips.
- Arm movements and forward-to-lateral momentum transfer were observed to dissipate forward COM momentum.
- Increased muscle activity in the lower limbs and back, along with shortened trailing limb steps, indicated a balance correction response.
Conclusions:
- The nervous system employs generalized strategies to correct for perturbations and maintain balance during locomotion.
- Unexpected slips during gait termination elicit compensatory movements and muscle activation patterns to restore stability.
- Adaptations in COM control, momentum transfer, and limb adjustments are crucial for recovering balance after a slip.
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