Possible factors to increase mechanomyographic signals during submaximal prolonged activity investigated from MUAP and MUMS(motor unit mechanical signal) wave-forms

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During prolonged isometric constant contraction at low level, mechanomyographic signal and its integrated value showed initial constant and then increased. It proposed the factors based on the motor unit activities to influence the mechanomyographic signal increment during the activity as follows : motor unit recruitment, motor unit firing interval changes and motor unit synchronization. However, yet not, the experimental results did reported. In the present experiments, it showed the possibility of the mechanomyographic signal increment in the motor unit recruitment, but there was no relationship between mechanomyographic signal increment and the motor unit synchronization, and motor unit firing interval changes.