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Intramuscular and intermuscular coherence analysis while obstacle crossing during treadmill gait
Lin Wen1, Tatsunori Watanabe2,3, Yoshitaka Iwamoto1
1Department of Biomechanics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
Somatosensory & Motor Research
|December 25, 2023
Summary
Obstacle avoidance increases common synaptic drives to motor units in leg muscles, particularly ankle dorsiflexors and knee flexors. This suggests enhanced neural control for adapting gait during challenging walking conditions.
Area of Science:
- Neuroscience
- Biomechanics
- Motor Control
Background:
- Understanding neural control of gait is crucial for rehabilitation and understanding movement disorders.
- Obstacle avoidance requires complex motor adjustments and precise neural coordination.
Purpose of the Study:
- To investigate the contribution of common synaptic drives to motor units during obstacle avoidance.
- To analyze changes in electromyography (EMG) signal coherence during obstacle negotiation.
Main Methods:
- Fourteen healthy volunteers performed treadmill walking with and without obstacle avoidance.
- Surface EMG signals were recorded from multiple leg muscles (tibialis anterior, biceps femoris, semitendinosus, gastrocnemii).
- Beta-band (13-30 Hz) EMG-EMG coherence was analyzed to assess common synaptic input.
Main Results:
- Significantly higher beta-band EMG-EMG coherence was observed in tibialis anterior (TAp-TAd) during the swing phase when avoiding obstacles.
- Increased coherence was also found in biceps femoris and semitendinosus (BF-ST) during the pre and initial swing phases of obstacle avoidance.
- No significant differences in coherence were found during the stance phase for any muscle pairs.
Conclusions:
- Findings suggest increased common synaptic drives to motor units in ankle dorsiflexor and knee flexor muscles during obstacle avoidance.
- This may indicate a greater cortical contribution to modifying gait patterns for obstacle negotiation.
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