Abstract
This study was designed to examine the effects of length changes in ankle dorsiflexor, tibialis anterior, on the muscular activities, using the mechanomyogram (MMG), electromyogram (EMG) force output during isometric ramp contractions. The relationships between the root-mean-squared amplitude (RMS) of the MMG and relative force (% MVC) in the dorsiflexed ankle and plantarflexed ankle were markedly different from those in the neutral positioned ankle. Although the RMS amplitude of EMG in the dorsiflexed ankle demonstrated the wide difference from those in the neutral positioned ankle, those in the plantarflexed ankle showed the almost same pattern as in the neutral positioned ankle. These changes in EMG and MMG would suggest that the changes in length of muscle probably influence the muscle activation pattern during isometric ramp contraction.
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