トライアスロンに関する体力医学的研究 皆生トライアスリートのエネルギーバランスについて

Abstract

The purpose of the present study is to investigate how to supply energy before and during triathlon (one of the hard endurance events) from the viewpoint of physical fitness and health. Experimental subjects were nineteen healthy Japanese males, 25 to 57 years of age, who had completed the fourth Kaike Triathlon (3.0 km swimming, 103.6km bicycling and 42.195km running). Energy expenditure and energy intake before and during the triathlon were estimated by the method of Numajiri (1976) and the Japanese Ministry of Public Welfare (1984). 1) Mean values of the exercise intensity (RMR) were 7.45, 5.16, and 9.17 during swimming, bicycling and runing, respectively. Mean value of the exercise intensity for the overall triathlon competition was presumed 7.261±0.88 RMR (x±SD). 2) Mean values and standard deviations of energy expenditure were 956.7±105.5kcal, 1837.6±l78.8kcal and 3006.3±345.1 kcal during swimming, bicycling and running, respectively. That is, an energy expenditure during marathon was presumed 52% of the overall energy expenditure of the triathlon. 3) Mean values of energy expenditure per body weight were 93.05 kcal/kg, 92.97 kcal/kg and 91.16 kcal/kg in the upper (elite), the middle (good) and the lower (slow) group, respectively. There are no significant differences among these three groups. That is, mean value of energy expenditure during the Kaike Triathlon was presumed about 93 kcal/kg, having nothing to do with the order of the competition. 4) Mean values and standard deviations of energy intake were 360.3±222.4 kcal, 1127.6±438.1 kcal and 524.3±305.2kcal, at breakfast, after swimming, during bicycling and running, respectively. 5) Five of experimental subjects had lost more than 1000 kcal and another five had lost 500 kcal or so before start of marathon running already. Apparently half of the subjects showed negative energy balance.