ダウン症候群男児の日常身体活動量が持久性能力と肥満度に及ぼす影響について

概要

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The purpose of this study is to investigate the effects of daily physical activity on the endurance ability and the obesity index in a boy with down's syndrome. We examined the subject's obesity index and he was mildly obese(Rohrer-index:161.4, body fat:24.8%). The amount of daily physical activity and its intensity(light,moderate and vigorous) was estimated by a pedometer(Lifecorder) two times during the school term and during the summer vacation. There were significant differences between the school term period and the summer vacation period in steps/day(9347±1561 vs 7086±2517, p<0.001), light activity(min/day)(70.7±10.3 vs 52.6±13.0 p<0.001)and vigorous activity(min/day)(6.4±2.9 vs 2.7±1.6 p<0.001). There was no significant difference in moderate activity(min/day). We conducted walking tests before and after the summer vacation to examine the walking speed at a heart rate of 132 beats/min(aerobics with smile), which we used as the index of endurance ability. His walking speed changeed from 80.8m/min(pre-summer vacation) to 56.1m/min(post-summer vacation) showing a decline in endurance ability. This suggests that the decrease in daily physical activity during summer vacation influenced the decline in endurance ability of the subject.