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Neuromuscular Activity Controls Human Movement

 One of the main projects in our lab is to elucidate the mechanisms of motor control through joint movements and neuromuscular activity during movement. Conventionally, motor control has been analyzed using inverse kinematics or muscle synergy analysis with surface electromyography. However, it has become possible to measure motor unit activity using high-density surface electromyography in recent years. This technique has enabled the measurement of neural activity in muscles, which was previously immeasurable, allowing for the elucidation of neural control.

 Our research is not just about unraveling the complex relationship between biomechanics and motor neurophysiology. It's about using this knowledge to make a tangible difference in human movement. We employ a comprehensive set of tools, including a 3D motion analysis system, a force plate-equipped treadmill, ultrasound diagnostic equipment, and high-density surface electromyography, to measure human movements during activities like quiet standing and walking. Our ultimate goal is to provide practical insights that can be directly applied to enhance neural control mechanisms during movement.

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Neuromuscular Physiological Function in Post-Stroke Patients

This research project aims to elucidate the mechanisms of recovery from neurophysiological abnormalities in the muscles of stroke patients. After stroke onset, the neurophysiological abnormality called paralysis occurs and impairs voluntary movements for a long time. Paralyzed muscles cause muscle degeneration chronologically, or their condition changes depending on the use of the paralyzed limb. Therefore, paralyzed muscles do not always recover in proportion to the spontaneous recovery of the brain. The important aspect of improving paralysis in stroke is to focus on the neurophysiological characteristics of the muscles.

Our projects take a unique approach to analyzing motor unit activity in stroke patients using multi-channel surface electromyography. This method has yet to be widely used in this context. This approach allows us to elucidate the neurophysiological recovery process in a novel way. The information from motor unit activities will contribute to the development of rehabilitation for true recovery of neurophysiological abnormalities in stroke, sparking curiosity and interest in our research.

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