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Excerpt
The purpose of this study was to examine the effects of isokinetics muscle strength training with high intensity and endurance in eccentric (ECC) and concentric (CON) muscle actions for long distance runners, and to investigate the influence of the ECC and CON muscle strength training on running performance. The training groups were divided into ECC muscle strength training group (n=7),CON muscle strength training group (n=7) and control group of only specialty training (n=6). The training was performed using KIN-COM for knee extensors, and enforced 4 sets of 50 repetitions by an angular velocity of 120 ° /sec, performed 2 times per week for 6 weeks in both ECC and CON muscle strength training group. The result of the training showed that the peak torque of ECC muscle strength training group was increased (ECC 12.9% and CON8.9%, respectively) in compare with other groups in both ECC and CON muscle actions. The decline rate of muscle endurance in ECC muscle action showed a significant improvement (pre 6.4%, post 0.7%) only in the ECC muscle strength training group. Also, the decline rate of muscle endurance in CON muscle action showed a significant improvement (pre 35.9%, post 24.3%) only in the CON muscle strength training group. Running performance (5000m record) improved 1.3% only in the ECC muscle strength training group. These results suggested that ECC muscle strength training is effective in progress of muscle strength, and make a contribution to the performance of long distance runners.
