| Research Abstract |
Experiment I investigated the weight reducing effects of a high protein diet combined with aerobic exercise on the body composition, physical working capacity (PWC: muscle strength, maximal leg power, maximal anaerobic power and aerobic power), blood constituents and urinary nitrogen (N) excretion in female college softball players carring out muscle strength training in the re-training period after the off-season. The weight reducing period was 35 days, and the energy intake was 500 kcal-day^1 less than the energy intake level before the weight reducing program. Diet group (D: N=6) had 2.0 g・kg^1 day^1 of protein intake, and Control group (C: N=5) had a.5g・kg^1day^1 of protein intake. All vitamin and mineral intake in this diet were higher than the Japanese recommended dietary allowance in both groups. This weight reduction program decreased the amounts of body fat (-1.71kg, P<0.001), while maintaining LBW (+0.48 kg, ns). The estimated value of the N balance was positive (+0.61g). Moreover, PWC did not show significant changes in either group. It became clear that weight reduction program based on our previous research could be successfully applied. The Experiment II was performed using a similar technique. Research on this diet (1.5g・kg^1 day^1 of protein intake: N=5) investigated whether it increased PWC. After dieting, body fat decreased (-1.07kg, P<0.001) and LBW (+0.55 kg, ns) was maintained. However, PWC was not improved. The estimated value of the N balance was positive (+0.02g). These data suggested that the protein intake of 1.5 to 2.0g・kg^1 day^1 to contain in diet for weight reduction of the athletes after the off-season was appropriate
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