Maximal oxygen uptakes (V^^.O_2 max) of 232 young children (117 males and 115 females) aged from 3 to 6 years were determined by means of exhaustive ground run. Their height, weight, and skinfold thickness were also measured. Furthermore, 142 of the subjects aged from 4 to 6 years performed 5-minute run and the distance covered was recorded. The following results were obtained: 1) No significant sex differences were found in body height and weight. However, upper arm skinfold thicknesses of females were significantly larger than those of males at all the ages; 3 years, 4 years, former half of 5 years, latter half of 5 years and former half of 6 years. 2) Mean values of heart rate during the period of collecting expired air for the determination of V^^.O_2 max were between 200.0 and 208.3 bpm. 3) Absolute values of V^^.O_2max (1/min) for males were .655, .789, .894, .922 and 1.004 at the respective ages of 3, 4, former half of 5, latter half of 5 and former half of 6 years. The values of females were .523, .751, .800, .837 and .868 1/min at the corresponding ages. Significant sex differences were found at all the ages with an exception of 4 years. 4) Relative values of V^^.O_2max (ml/kg/min) for males reached 42.6, 47.4, 50.5, 48.7 and 48.1 at the respective ages. Those of females were 35.9, 44.5, 44.5, 45.6 and 44.7 respectively. In V^^.O_2max (ml/kg/min), the assumed index of aerobic work capacity, males were significantly superior to females with single exception of four year-old group. 5) As to oxygen pulse (ml/beat) males registered larger figures than females at all the ages except one. Here again, such sex difference was not observed for the group of four year-old children. 6) When a histogram of V^^.O_2max (ml/kg/min) was constructed for all the ages from three to six, years inclusive, the scores distributed almost symmetrical around their mean values, i.e., 48.4 for males and 44.4 for females, with standard deviations of 5.4 and 5.0 for males and females, respectively. X^2-test revealed that the deviations of these distributions from the normal curve was not significant statistically. 7) Regression equations of absolute values of V^^.O_2max (y; 1/min) to body weights (x; kg) were y^^^ = .052x - .067 (n = 117, r = .845) for males y^^^ = .039x + .096 (n = 115, r = .750) for females. 8) Regression equations of 5-minute endurance run (y; m) to relative values of V^^.O_2 max (x; ml/kg min) were y^^^ = 4.45x + 650.2 (n = 73, r = .273) for males y^^^ = 3.62x + 614.5 (n = 69, r = .308) for females.
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