KINETIC AND EMG ANALYSIS OF THE NEW DEDIGN STEPWISE LOADING SYSTEM

Abstract

The great muscle strength and power are important factors for successful sport performance. Many strength coaches instructed their athletes to move the weight for developing muscle strength. However, most weight training systems consist of lifting a steady load, this having the drawback of nol accounting for the change in strength with the change in muscle length. In order to solve this problem, this study developed a stepwise weight training system using linkage which is capable of increasing the load in isotonic contraction, then compared kinetics and muscle activation between the stepwise contraction and the traditional isotonic contraction. The results showed that both the normalized peak tension and the angle of peak tension of the stepwise contraction were significantly larger than traditional isotonic contraction. The normalized impulse and the integrated EMG of the stepwise contraction was more than traditional isotonic contraction but not reached the significance The findings suggest that stepwise loading system can provide greater stimulus to muscle training effect than traditional weight training systems.