Physiological responses to short-term, high-intensity intermittent rowing exercise

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This study was designed to observe physiological response during one bout of high-intensity intermittent short time rowing exercise and to evaluate the effect of repeated bouts of the exercise on rowing performance for college oarsmen.The high-intensity, intermittent exercise consisted of either five or eight bouts of 20-sec rowing with the maximal effort of the subjects, and each bout was separated by 10-sec rest. In the first experiment, subjects reached to the maximal level of VO_2 and heart rate at the fourth set during both 5- and 8- sets of high-intensity, intermittent exercises. However, blood lactate concentration after high-intensity, intermittent exercise was significantly lower in the 5-set protocol than in the 8-set protocol (9.0±1.2vs. 11.3±1.6mM, p<0.05), suggesting that the 8-set protocol is much vigorous and better than the 5-set protocol as high-intensity, intermittent rowing exercise for rowers. In the 6-week rowing training, low frequency group (LF: 2 times/week) markedly improved their rowing performance (Δ3.2±1.9sec/1000m, Δ8.4±5.5sec/2000m time trials), whereas high frequency group (HF: 5 times/week) improved only in 1000m trial (Δ4.5±2.3sec).Bowers performed 5-week training regimens by single scull boat on water which consisted of high-intensity rowing exercise(8 sets/bout, 2 times/week). Their rowing performance in the 2000m-time trial on ergometer was significantly improved.These results suggest that high-intensity, intermittent rowing exercise on both ergometer and on water, which consists of 20-sec maximal exertion with 10-sec interval, 8 sets/bout, 2 times/week, more than 6 weeks, could be recommended to the collegiate rowers in order to improve their rowing performance.