In this study, we investigated muscle cocontraction during a street dance movement task to provide evidence that the level of muscle cocontraction is associated with degree of proficiency in whole-body sensorimotor synchronization movement. Skilled street dancers and nondancers were required to synchronize a knee-bending movement in a standing position to a metronome beat. The dancer group showed significantly smaller variability of temporal deviation (defined as the peak kneeflexion time minus beat onset time), and lower level of muscle cocontraction analyzed by electromyographic data of the agonist and antagonist muscles of the upper and lower leg than did the nondancer group. In addition, multiple regression analyses revealed that the group effect significantly predicted the level of muscle cocontraction. These results show that the level of muscle cocontraction in the lower limbs during whole-body sensorimotor synchronization movement is associated with the degree of proficiency of the movement.
Miura, Kudo, Ohtsuki, and Nakazawa are with the Department of Life Sciences, Graduate School of Arts and Sciences, the University of Tokyo, Tokyo, Japan. Miura is also with the Japan Society for the Promotion of Science, Tokyo, Japan. Kanehisa is with National Institute of Fitness and Sports in Kanoya, Kanoya, Kagoshima, Japan.