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Extracting phase-dependent human vestibular reflexes during locomotion using both time and frequency correlation
Jean-Sébastien Blouin1, Christopher J Dakin, Kees van den Doel
1School of Kinesiology, University of British Columbia, Vancouver, British Columbia, Canada. jsblouin@interchange.ubc.ca
Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 27, 2011
Summary
Stochastic vestibular stimulation reveals phase-dependent vestibular reflexes during walking. This technique effectively measures how vestibular input influences muscle activity during locomotion, particularly in the medial gastrocnemius.
Area of Science:
- Neuroscience
- Human Physiology
- Biomechanics
Background:
- Locomotion requires dynamic vestibular input modulation onto motoneurons.
- Current vestibular stimulation methods have limitations in human reflex analysis.
- Stochastic vestibular stimulation (SVS) offers an alternative for extracting human vestibular reflexes.
Purpose of the Study:
- To investigate the phase dependency of human vestibular reflexes during locomotion.
- To utilize time-dependent coherence and cross-correlation with SVS.
- To understand the coupling between vestibular signals and muscle activity during walking.
Main Methods:
- Employed stochastic vestibular stimulation (SVS).
- Utilized time-dependent coherence and cross-correlation analysis.
- Investigated medial gastrocnemius muscle activity during the stance phase of locomotion.
Main Results:
- Phase-dependent activity in medial gastrocnemius muscles correlated with vestibular signals (2-20 Hz) during the stance phase.
- Maximum vestibular-gastrocnemius coupling occurred 21-23% into the step cycle, before peak muscle activity.
- Demonstrated effectiveness of SVS and time-frequency decomposition for analyzing vestibulomotor coupling.
Conclusions:
- Vestibulomotor coupling is phasically modulated during human locomotion.
- The strongest coupling does not coincide with maximal muscle activation.
- SVS is an effective tool for assessing vestibular ex-afference's contribution to motor control during walking.
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