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Vibration-induced changes in EMG during human locomotion.
Sabine M P Verschueren1, Stephan P Swinnen, Kaat Desloovere
1Motor Control Laboratory, Department of Kinesiology, Faculteit Lichamelijke Opvoeding en Kinesitherapie, Katholieke Universiteit, 3001 Leuven, Belgium. sabine.verschueren@flok.kuleuven.ac.be
Journal of Neurophysiology
|March 11, 2003
Summary
Tendon vibration in leg muscles, like the quadriceps femoris, enhances electromyographic (EMG) activity during walking stance. This suggests Ia afferent input plays a role in controlling muscle activity and gait transitions.
Area of Science:
- Neuroscience
- Human Locomotion
- Motor Control
Background:
- Understanding the neural control of human locomotion is crucial for rehabilitation and performance.
- Ia afferent input from muscle spindles is a primary sensory feedback pathway.
- The specific contribution of Ia afferents to gait dynamics remains an area of investigation.
Purpose of the Study:
- To investigate the role of Ia afferent input in generating electromyographic (EMG) activity during human walking.
- To determine if Ia afferent stimulation influences muscle activation patterns and gait phase transitions.
Main Methods:
- Subjects walked blindfolded while receiving continuous tendon vibration to leg muscles.
- Mean EMG activity was measured during stance and swing phases.
- Onset time of tibialis anterior activity was recorded to assess gait transition timing.
Main Results:
- Vibration of quadriceps femoris (Q) and biceps femoris (BF) enhanced EMG activity, primarily during the stance phase.
- Vibration of ankle and hip muscles did not significantly affect EMG burst amplitude.
- Quadriceps femoris vibration led to an earlier onset of tibialis anterior activity, indicating altered gait timing.
Conclusions:
- Ia afferent input from quadriceps femoris and biceps femoris contributes to EMG activation during the stance phase of walking.
- Ia afferent pathways, particularly from the quadriceps, may be involved in triggering gait phase transitions.
- These findings highlight the significant role of Ia afferent feedback in human locomotion control.