Abstract
The purpose of this study was to evaluate interrelation among knee muscle force, foot grip power, toe grasp ability, and single-legged balance. The evaluation was carried out on 21 university handball club members (11 male, 10 female, mean age 22.1 years). Concentric and eccentric muscle torques of knee flexors and extensors were measured using a Kin/Com dynamometer. Foot grip power was measured using a hand grip dynamomenter. Toe grip ability was evaluated to rotate the axis of a special device using toes as fast as possible. The movement of lower limbs on monopodal stance was recorded using a triaxial accelerometer attached firmly to the skin on both knees. Maximal amplitude of acceleration was used as a parameter for postural sway. We analyzed functional correlation using a Spearman rank correlation coefficient and ANCOVA for the right and left legs separately. As a result, single legged balance was found to correlate significantly with toe grip ability. The toe grip ability of the left foot showed no relationship with knee muscle power nor foot grip power, however relationship with balance failure and difficulty to perform rock, paper, and scissor movement was seen to some extent.
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