Activity of lower extremity muscle during the toe pressuring force action

: [Purpose] the purpose of this study was to investigate the activity of femoral and crural muscle during the toe pressuring force action, and examine relationship toe pressuring force and femoral and crural muscle. [subjects] subjects were 18 healthy adult females. [method] we compared the normalized integrated electromyogram (%iemg) of tib-ial anterior muscle, medial head of gastrocnemius muscle, and soleus muscle among dorsal flexion intermediate position, and plantar flexion. [result] the results showed crural mus-cles was confirmed 19.3 to 25.3% iemg of the maximum voluntary contraction. %iemg of the tibialis anterior muscle and medial head of the gastrocnemius muscle demonstrated a positive correlation with toe pressuring force ( (cid:9526) =0.53 and (cid:9526) =0.51, respectively). [conclusion] these results suggested that crural muscle was co ‐ contracting during the toe pressuring force action, and % iemg reflected toe pressuring force.