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Task-dependent compensatory responses to perturbations applied during rhythmic movements in humans
1Neural Control Laboratory, Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
Journal of Motor Behavior
|December 1, 1987
Summary
Human nervous system adapts responses to unexpected electrical stimuli during running, cycling, and hopping. Muscle responses vary by movement type, revealing task-dependent strategies for maintaining stability.
Area of Science:
- Human motor control
- Neuroscience
- Biomechanics
Background:
- The nervous system must adapt to unexpected perturbations during rhythmic movements.
- Understanding these adaptations is crucial for motor control research.
Purpose of the Study:
- To investigate how the human nervous system modulates responses to electrical stimulation during running, cycling, and hopping.
- To explore task-dependent strategies for managing perturbations in different rhythmic movements.
Main Methods:
- Subjects performed running, cycling, and hopping.
- Electrical stimulation was applied during different phases of these movements.
- Muscle responses in ipsilateral and contralateral limbs were recorded and analyzed.
Main Results:
- Responses were modulated and gated in limb muscles.
- Running and cycling elicited excitatory responses, while hopping showed inhibition.
- Adaptations were observed in the step cycle, particularly on the contralateral side during running.
- A simplifying strategy of activating the same muscle set was noted during cycling and hopping.
Conclusions:
- The nervous system employs task-dependent strategies to manage perturbations during rhythmic movements.
- Postural stability requirements and task constraints influence response organization.
- Findings offer insights into neural control mechanisms for adapting to unexpected events.