Relationship between the Center of Foot Pressure Sway and the Activities of the Muscles Involved in Ankle Rotation during the Crossover Step

TAKEUCHI Yahiko, YAMADA Masako

doi:10.1589/rika.25.85

[Purpose] We aimed to investigate the relationship between the sway characteristics of the center of foot pressure (COP) and the activities of the muscles involved in ankle rotation during the crossover step. [Subjects] Seventeen healthy young subjects participated in the study. [Methods] We defined the single-stance phase and landing phase during the crossover step on the basis of the vertical ground-reaction force values obtained using a separation-type load meter. Then, we used the load meter to measure the COP sway (COP-RMS) and the velocity of COP sway (COP-V) in the single-stance phase and the landing phase. In addition, we obtained electromyograms of the tibialis anterior, soleus, peroneus longus, and abductor hallucis. Single regression analysis was used to calculate the relationship between the sway characteristics of COP and the activities of the muscles. [Results] In the single-stance phase and the landing phase, a significant regression equation was obtained for the relationship between COP-V for the medial-lateral direction and the activities of the peroneus longus; we also obtained a significant regression equation for the relationship between COP-V of the anterior-posterior direction and the activities of the soleus. [Conclusion] The activities of the muscles involved in ankle rotation controlled the velocity of COP sway in the crossover step. In addition, we also observed that muscle activity in the medial-lateral/anterior-posterior direction was associated with COP-V.<br>

Relationship between the Center of Foot Pressure Sway and the Activities of the Muscles Involved in Ankle Rotation during the Crossover Step

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