Abstract
PURPOSE: The purpose of this study was to investigate the change of triceps surae activation during heel raise test in standing among knee flexion angles(<TEX>$0^{\circ}C$</TEX>, <TEX>$30^{\circ}C$</TEX>, <TEX>$45^{\circ}C$</TEX>, <TEX>$60^{\circ}C$</TEX>). METHODS: Twenty healthy individuals performed unilateral plantarflexion in standing with <TEX>$0^{\circ}C$</TEX>, <TEX>$30^{\circ}C$</TEX>, <TEX>$45^{\circ}C$</TEX>, <TEX>$60^{\circ}C$</TEX> knee flexion. Activity of medial gastrocnemius(MG), lateral gastrocnemius(LG), soleus(Sol) was recorded with surface electromyography(EMG). RESULT: The muscle activations induced the four different positions were compared and results showed that was significant difference MG and LG while the angle increase from <TEX>$0^{\circ}C$</TEX> to <TEX>$30^{\circ}C$</TEX>, <TEX>$45^{\circ}C$</TEX>, <TEX>$60^{\circ}C$</TEX> but Sol did not show significant differences in every angle. CONCLUSION: This study suggest that <TEX>$30^{\circ}C$</TEX> knee flexion is required to induce a significant mechanical disadvantage of gastrocnemius.
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