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Journal of the Korean Academy of Rehabilitation Medicine 1991;15(2):74-81.
Myoelectric signal change during submaximal isometric contraction.
Park, Hong Sik , Lee, Kang Mok
Department of Rehabilitation Medicine, Kosin Medical College, Pusan, Korea, *Department of Rehabilitation Medicine, College of Medicine, Hanyang University, Seoul, Korea
등척성 수축에 이한 피로와 근육의 전기적 신호변화
박홍식, 이강목*
고신대학 의학부 재활의학교실, *한양대학교 의과대학 재활의학교실

Neuromuscular adaptations to a submaximal static contraction for a period of one minute were investigated using healthy adult as frequency components of the electromyogram. Spectral analysis of the EMG signal revealed a shift to lower frequency components and a concurrent increase in the amplitude as a response to fatigue.

The magnitude of this SEMG frequency content shifts to lower values has been related to the intensity and duration of contraction.

The frequency shift and increase amplitude for the EMG signal were discussed in light of evidence for recruitment and synchronization of motor units and changes in muscle fiber conduction velocity as possible mechanisms.

Key Words: Mean frequency, Submaximal static contraction
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