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This study was designed to obtain data to evaluate the maximal aerobic work capacity for young female adult. Heart rate, oxygen uptake and energy cost for treadmill walking at different speed of 2, 4, 6 and 8㎞/hr with different grade of inclination were measured on 45 female college students aged from 18 to 22 years old. Maximal oxygen uptake were also measured on 25 subjects, comparing with the predicted values of them. Heart rate, oxygen uptake and energy cost treadmill walking increased with both speed of walking and grade of inclination. Maximal heart rate was 188.9±7.50 beat/min which amounted to 2.4 times of that at rest. Maximal oxygen uptake and energy cost were 40.0±6.59 ml/㎏/min and 12.1±1.85㎉/㎏/hr, respectively, which amounted to approximately 11 mets: 1 met was 3.8±0.69ml/㎏/min in terms of oxygen uptake or 1.1±0.17㎉/㎏/hr in terms of energy cost. There was an intimate correlation between oxygen uptake and energy cost with correlation coefficient of r=0.9761 (p＜0.01). Simple linear regression of energy cost on oxygen uptake was expressed as E (㎉/hr)=6.56±0.290VO_2 (1/min) with standard error of the estimate S_y＼z=±36.1㎉/hr. A liter of oxygen uptake was equivalent to 4.94㎉/min of energy cost. Both oxygen uptake and energy cost per unit body weight showed close correlations with heart rate with correlation coefficients of r=0.8623 (p＜0.01) and r=0.8442 (p＜0.01), respectively. Simple linear regressions of heart rate on oxygen uptake and energy cost on heart rate were expressed as HR (beat/min)=91.7 2.47 VO_2(1/㎏/min), 91.7 2.47 VO_2(1/㎏/min), and HR (beat/min)=93.8±8.03E(㎉/㎏/hr), respectively. It was concluded that the maximal aerobic work capacity for the young female adult could be evaluated by the regression equation of heart rate on oxygen uptake or on energy cost. Individual maximal aerobic work capacity could be assessed as "ordinary" when her heart rate during submaximal work was within the range of predicted heart rate±1 standard error of the estimate(HR_calc, ±S_y＼z), as "superior" below HR_calc, ±S_y＼z, and as "poor" above HR_calc, ±S_y＼z.
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