ASSESSMENT OF AEROBIC CAPACITY WITH SPECIAL REFERENCE TO SEX AND AGE OF JUNIOR AND SENIOR HIGHSCHOOL STUDENTS IN JAPAN

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  • 中川 旭子
    Department of Physiology, School of Health Sciences, University of Tokyo
  • 石河 利寛
    Department of Physiology, School of Health Sciences, University of Tokyo

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Thirty boys and twenty six girls of almost standard stature and body weight in junior and senior high schools were tested on a bicycle ergometer with the stepwisely increased loading. Maximal oxygen uptake was measured as related to age and sex. For the practical use, some physiological parameters and predicted value of maximal oxygen uptake from submaximal work were examined. The following results were obtained:<BR>1. Mean values of measurements in the subjects were as follows:<BR>male age 12-13 14-15 16-17 number 10 10 10 stature (cm) 149.6±5.6 160.5±4.0 166.2±1.3 weight (kg) 39.6±3.7 50.0±4.4 56.8±1.5 max Vo2 (1/min) 1.62±0.24 2.09±0.29 2.41±0.32 max Vo2 (ml/min/kg) 40.7±3.9 42.0±6.7 37.7±5.6 female number 10 10 6 stature (cm) 150, 0±2.0 154.3±1.5 154.8±0.5 weight (kg) 41.3±3.1 47.9±2.1 51.0±2.0 max Vo2 (1/min) 1.44±+0.15 1.39±0.12 1.37±0.15 max Vo2 (ml/min/kg) 34.9±3.6 28.9±2.6 26.7±3.3<BR>2. Maximal oxygen uptake increased in advance of age in the males, but slightly decreased in females. Maximal oxygen uptake per body weight showed a peak at 14-15 years in males, but it decreased with the age in females.<BR>3. Maximal performance, maximal oxygen pulse, maximal oxygen pulse per body weight were significantly correlated to maximal oxygen uptake per body weight. They may have physiological significance in themselves, but they are not so feasible as to be used for a practical substitute for the maximal oxygen uptake.<BR>4. Response of heart rate to a given load, that is, predicted maximal oxygen uptake with ÅSTRAND-RYHMING nomogram, PWC170/kg and fitness index of the Step Test (Modified Harvard Step Test adopted by the Ministry of Education, Japan) had no significant correlation to maximal oxygen uptake. The invalidity of the former two measurements was derived from the lack of a steady state due to stepwise loading in every two minutes. The latter test was considered to be too weakly loaded.<BR>5. Stepwisely increased loading method, every two minutes on a bicycle ergometer, is adequate for the measurement of direct maximal oxygen uptake, but in this procedure no practical parameters including indirect predicting method with ÅSTRAND-RYHMING nomogram can be substituted for maximal oxygen uptake.

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