Non-invasive analysis of recruitment properties of human motor units using electrical muscle stimulation

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The purpose of this study was to test whether recruitment properties of human motor units can be non-invasively determined by using electrical muscle stimulation. Specifically, a single electrical pulse was applied to the resting muscle before and after a 6-s voluntary force production and then the "potentiation" of electrically evoked contractile response due to the voluntary force production was determined. The results suggest that the magnitude of potentiation represents the recruitment properties of fast-twitch muscle fibers during voluntary muscle contraction predicted from the "size principle".