RELATIONSHIP BETWEEN ANKLE PLANTAR FLEXOR POWER AND EMG MUSCLE ACTIVITY DURING GAIT
Keywords: ankle plantar flexors, ankle power generation, emg
AbstractIt is thought that the ankle power (A2) burst observed in human gait is solely generated by rapid concentric contraction of the ankle plantar flexors. Recent work, however, suggests that the return of elastic energy may play a role. This study investigated the temporal relationship between the maximum electromyographic activity (EMG) of the ankle plantar flexors and A2. The natural gait of eight young adults were recorded across level ground. Collectively, the maximum EMG of the Soleus, Gastrocnemius and Peroneus Longus fell 92 ms before A2. The period between maximum EMG and A2 were longer than the electromechanical delay reported in the literature (e.g. 8 to 45 ms). It is reasonable to conclude, therefore, that it may be partly produced by the return of elastic energy stored in the musculotendinous units of the plantar flexors during the A1 absorption period.
Authors can retain copyright, while granting the International Society of Biomechanics in Sports (ISBS) the right of first publication.