1999 Volume 32 Issue 1 Pages 70-81
The purpose of this study was to investigate the effects of intermittent training, based upon the requirement of judo competitions, under simulated high-altitude hypoxia conditions on the aerobic and the anaerobic capacities. Ten male university judo competitors were divided into two groups: an experimental group, trained under conditions of low pressure and low oxygen concentrations (3,000m, 525Torr, E group, n=6); a control group, trained under sea level condition (0m,760Torr, C group, n=4). Training protocol consisted of three sets of pedaling exercise (5 repetitive bouts of 2 kp for 50 seconds followed by 5 kp for 10 seconds, two times/week, for 8 weeks). Maximal oxygen uptake (VO2max), ventilation threshold (VT), peak heart rate (HRmax), the time to exhaustion and the maximal work load were examined to exhaustive exercise for estimation of the aerobic capacity. The anaerobic capacity was estimated by the judo test, perform uchikomi for 30 seconds (“Speed-Uchikomi”) and 15 times of nagekomi (“Speed-Nagekomi”) as quickly as possible. “Speed-Uchikomi” was evaluated as the average of the total number of repetitions during 3 trials of uchikomi. “Speed-Nagekomi”, composed of 3 different throwing techniques, was evaluated as the time taken for nagekomi to be undertake. VO2max significantly increased in the E group, marked improvements were observed in the maximal work load and the time to exhaustion in the E group.The frequencies of “Speed-Uchikomi” were significantly decreased, and the time required for “Speed-Nagekomi” was significantly shortened in the E group.These results suggest that intermittent training under simulated high-altitude hypoxia conditions were an effective means of improving aerobic capacity. Additionally it is concluded that these kinds of training also contribute to the enhancement of anaerobic capacity, evaluated by the judo test.
