The oxygen uptake in treadmill walking at speeds of 2, 4, 6 and 8 km/hir on the slopes from 0(level) to, 25´% of gradient was measured by means of the Douglas bag method on 74 male college students. Correlation coefficients and multiple regression formulae-of V02(ml/min) and V0z/body weight (ml/k.-/min) on multivariables such as speed, square of speed, gradient and body weight were calculated. Regression formulae for prediction of the gross oxygen uptake(formulae 1, 3; 4, 5, 6 and 7) in treadmill walking were all highly significant with correlation coefficients ranging from 0. 84150 to 0. 89227, and standard errors of , the estimates ranged from 397. 3 ml/min to 475.8 ml/min.
Regression formulae for prediction´ of the oxygen uptake per unit body weight(formulae 2, 8 9, 10, 11, and 12) were also all significant with correlation coefficients ranging from 0. 84201 to 0. 90913, and their standard errors of the estimates ranged from 6.6 ml/kg/min to S. 6 ml/kg/min.
It was found through regression analysis and means of the differences between the predicted and the actually measured oxygen uptake, that the following two formulae (2) and (3) were the most valid equations for predicting both oxygen uptake per unit body weight and gross oxygen uptake in treadmill walking:
V0z/wt = (0. 057G + 0.26) Vz + 0.51G + 1. 71 (2)
V02 = 71. 6G + 359. 6V - 546. 1 (3)
Standard errors of the estimates and means of the difference between the predicted and the measured by the formula(2) were S.E. = 29. 74 ml/kg/min and ´d = 0.46 ml/kg; min and S.E. = 258._4 ml/min and d = 23.7ml/min ´ by the formulae(3).
In predicting the oxygen uptake in treadmill walking, equations expressed as a function´ of speed or square of the speed and gradient were all proved to be valid, whether it was gross oxygen uptake or per unit body weight. The mean values of measured oxygen uptake for the Korean male college students were larger than those of the predicted values calculated by the formulae suggested by some foreign researchers. This discrepancies may arise, in part, from the racial difference in aerobic work capacity.
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