ABSTRACT

　We have previously shown that high-frequency（daily six maximal eccentric contractions x 5times per week）training at maximal load and eccentric contraction training could increase muscle strength and muscle thickness of elbow flexors. In the present study, we aimed to extend this knowledge and clarify the effects of highfrequency training using a submaximal load,i.e., 2/3 and 1/3 of the maximal eccentric contraction strength. Thirty-six healthy university students were randomly divided into three groups: 2/3group （n=12）， 1/3group （n=12），and control group （n=12）：The 2/3 and 1/3 groups that performed six eccentric contractions with 2/3 or 1/3 maximal eccentric contraction torque using a dumbbell 5 days a week for 4 weeks or control group that did not perform any training. We measured muscle strength and muscle thickness of elbow flexors before and after the 4weeks intervention period. The results showed a significant（p<0.05）increase in muscle strength and thickness in only the 2/3group but no significant change in the 1/3group nor the control group. Also, there were no significant differences in muscle strength and thickness increases between the 2/3group and maximal eccentric contraction training group shown in the previous study. Therefore, using more than 2/3 of the maximal eccentric contraction torque for highfrequency, eccentric contraction resistance training is necessary.

DECENTE SPORTS SCIENCE Vol.46/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE