Effects of rapid weight reduction diet on protein metabolism and physical performance.
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概要
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The purpose of this study was to provide information on the requirement of nutrition, especially of the protein during rapid weight reduction imediately before a competition of a weight-classification system sport, boxing. Weight reduction period was 9 days. Subjects were divided into three groups of free diet group (group A: n=5), high protein diet group (group B: n=5) and ordinary protein diet group (group C: n=4). Group A had taken food ad libitum. Group B had taken 2.0g/kg/day of protein in the first half and 1.5g/kg/day of protein in the second half of weight reduction period, and Group C had taken 1.0g/kg/day of protein throughout weight reduction period. Groups B and C had taken 2, 000kcal/day in the first half and 1, 200kcal/day in the second half of weight reduction period. Anthropometry and nutritional investigation were performed, and urine components were analyzed. The main results obtained were as follows;<BR>1) Calory and protein intake in Group A averaged 883kcal/day and 0.9g/kg/day in the second half of weight reduction period.<BR>2) 3-methylhistidine and urea nitrogen in urine and 3-Me/Cr increased significantly at the end of weight reduction period in Group A, but decreased significantly in groups B and C. Nitrogen balance changed to a negative value only in group A. Differences in each of urine components were statistically significant between group A and the other two groups at the end of period.<BR>3) Heart rate and oxygen intake at the same submaximal work load increased signifihantly in group A at the end of weight reduction period, but in groups B and C no noticeable changes were observed.<BR>Following conclusion was derived: when food was taken ad libitum throughout the weight reduction period, the protein of the whole body muscle was brought on surplus degradation and oxygen in take at the same submaximal work load increased. Therefore, group a might suffer disadvantage in keeping health and physical performance. Athletes are essential to take at least 1, 200kcal/day of food energy and 1.5g/kg/day of protein when trying to reduce weight immediately before competition.
- 日本生理人類学会の論文
日本生理人類学会 | 論文
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