Abstract: Objective: to study the effect of vibration frequency on the vibration training of muscle strength and its mechanism through subjects’ weight-bearing squat training at different vibration frequencies. Methods: Thirty male college students were chosen as subjects to do weight-bearing squat training at different vibration frequencies on the vibration table. A three-dimensional image measuring instrument and a force platform were used to collect the kinematical and dynamic data of 50cm deep jump and weight-bearing squat synchronously. The Swiss multi-joint isokinetic muscle strength testing system was used to collect muscle strength indicators of knee joint centripetal and centrifugal contraction. The data collected before and after the experiment were statistically analyzed. Results: In terms of deep jump-related impulse, rebound time and rebound height, the high-frequency group is obviously superior to the low-frequency group. In terms of weight-bearing squat-related maximum force, stretching time and changing range of impulse, the high-frequency group is superior to the low-frequency group too. The high-frequency group presents a better performance than the low-frequency group in terms of peak torque of muscle strength and the increasing range of maximum power. Conclusion: higher vibration frequency (35-45Hz) is more conducive to improving the plyometric exercise capacity of lower extremity muscles, both the centripetal ability and energy reservation of leg extensor muscle group and both the peak torque and the maximum working efficiency of knee joint in centrifugal and centripetal movements.

Key words: Vibration Training, Vibration Frequency, Muscular Strength, Sport Biomechanics