持久的身体活動が発育期児童の心形態・機能に及ぼす影響 : 縦断的検討

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The influence of aerobic exercise on cardiac dimensions and functions was studied in 115 normal children (aged 13 to 15 years) in exercise (n=66) and control (n=49) group. Each group was divided into 3 groups, such as 1C(13 yr, n=14), 2C(14 yr, n=15), 3C(15 yr, n=20),and 1E(13 yr, n=23), 2E(14 yr, n=24), 3E(15 yr, n=19). Echocardiographic study was performed at rest in each groups. The exercise group participated in an aerobic exercise session that met 1-2 hours/day, 5-7 days/week for 21 weeks. Each exercise bout was performed about 65% of predicted HR max. The results were as follows: 1) There was no significant change in left ventrivular wall thickness, left ventricular mass and fractional shortening between control group and exercise group. 2) Left ventricular diastolic dimension and stroke volume exhibited a significant increase in exercise group. 3) These findings indicate that when compared with control groups, pubertal children involved in an aerobic exercise program (about 65% HR max) showed progressive increase in left ventricular diastolic dimension and stroke volume and no change in left ventricular wall thickness, left ventricular mass and fractional shortening.
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