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Vibration-induced postural reaction continues after the contact with additional back support
1Institute for Information Transmission Problems, Russian Academy of Science, Bolshoy Karetny 19, Moscow, 101447, Russia.
Motor Control
|October 6, 2000
Summary
Achilles tendon vibration triggers complex postural reactions involving leg and trunk muscles. Support location influences body sway, demonstrating a whole-body response rather than a localized joint reaction.
Area of Science:
- Neuroscience
- Biomechanics
- Human Physiology
Background:
- Postural control is crucial for maintaining balance during standing.
- Vibration of specific muscles can evoke reflex responses that challenge stability.
- Understanding these responses is key to understanding sensorimotor integration.
Purpose of the Study:
- To investigate the characteristics of postural reactions induced by Achilles tendon vibration.
- To examine how different support conditions affect these vibratory reactions.
- To determine if the reaction is localized or a complex synergy.
Main Methods:
- Subjects stood normally, near support, or with support altering initial posture.
- Achilles tendon vibration was applied to induce postural reactions.
- Support was provided at sacral or shoulder levels, and initial body-support interaction was manipulated.
Main Results:
- Vibration in normal standing caused backward upper body movement.
- Sacral support allowed continued backward movement with increased toe pressure.
- Shoulder support led to reversed motion and oscillations in some subjects.
- Initial posture changes did not significantly alter the vibration reaction.
Conclusions:
- Vibration-induced postural reactions are complex synergies involving leg and trunk muscles.
- These reactions integrate sensory information from the whole body, not just local joints.
- Support interaction influences the manifestation of the postural response.