不同比例之等速離心和向心聯合收縮對肱三頭肌肌力和肌耐力之影響

Eccentric muscle actions was an important part of strength training. However, how much eccentric action is optimal for muscular strength and endurance development is not known. The purpose of this study was to examine the different combination ratios of eccentric (ECC) and concentric (CON) muscle actions on the peak torque and enddurance ratio of the triceps brachii. Sixty-nine (69) untrained males (body weight 65.1±10.6kg; height 172.3±5.9cm; age 18.4±3.4 yrs) were randomly assigned into 6 groups: 100%ECC, 75%ECC-25%CON, 50%ECC-50%CON, 25%ECC-75%CON, 100% CON and CONTROL. Subjects were trained on Cybex 6000, using120°/sec, 2 days/wk, with individually designed repetitions, for 7 wks. Peak torque and endurance ratio (concentric) were measured before, at 4th wk and after training. A two-way ANOVA was used for data analysis. For Triceps peak torque, 100%ECC, 75%ECC-25%CON and 50%ECC-50%CON were higher than 25%ECC-75%CON, 100%CON and CONTROL groups. In Triceps endurance ratio, the 100% ECC group improved most significantly. CONCLUSIONS: A combination ratio of over 50% eccentric muscle actions seems to be the best for strength development.However,100%eccentric was the best for endurance training. Nevertheless, the 100% eccentric muscle action was best of simultaneous training for strength and endurance.