The purpose of this study was to verify the effect on improvement of muscle st rength unbalance

according to load deviation protocol during whole body vibration exercise.

Seventeen female volunteers (age 22 3 years, height 160 4.9 cm, weight 49 ±±.8 kg, WBV Group: 10, CON Group : 7) participated in this experiment. The subjects performed squa t exercise in WBV platform(Sonicworld. Co., Ltd., Wonju, Korea). Exercise were performed five set a day including 15 time a set, three days a week, and during 4 weeks. We estimated of knee joint torque for evaluating muscle strength. We adapted WBV to be d ifferent intensity for providing muscle strength in both of legs. Vibration stimulus was 25Hz as frequency and intensity was dominant leg 1mm and non dominant leg 4mm. The results in WBV group showed that the differences of peak torque in 16% were getting decreasing significantly after 4 weeks from 16.2% to 5.2%. But Con group showed that the differences of peak torque in 3.2% were getting increased after 4 weeks from 3.2% to 5.9%.

This result means that WBV with load deviation protocol could provide muscle strength exercise for muscle strength balance. Our study found out that WBV of load deviation protocol could provide muscle strength exercise for improving muscle imbalance.