抄録
We investigated the effects of the alternate activity in the synergistic muscles (type AA) and the enhanced physiological tremor (type EPT) on 1) maximal muscle force, muscle endurance performance and static work and 2) these parameters on the next day. Eight male subjects performed prolonged static contractions at an ankle joint angle of 110°and 130°plantar flexion under constant load of 10% maximal voluntary contraction as a fatigue test on days 1 and 2. Surface electromyograms were recorded from the triceps surae muscle. Endurance time in the AA group was significantly longer than that in the EPT group on both days (p<0.05). The fatigue test significantly reduced the maximal force in both groups on days 1 and 2 (p<0.05), but the rate of decrease in the maximal force was greater in the EPT group than in the AA group. Endurance time and static work in the EPT group declined by 40% and 45% on day 2, respectively (p<0.05). However, no significant differences in these parameters in the AA group were found between days 1 and 2. The results suggest that the type AA may reduce the development of muscle fatigue and have little effect on the static work on the next day.
