Abstract

The oxygen cost and energy requirement of submaximal treadmill running was assessed on trained (n = 1) males and trained (n = 5) and untrained (n = 6) females. Open circuit spirometry was used to determine each subjects oxygen consumption during the final 2 minutes of 5-minute runs at 135, 150, 165, and 180 m/min. Two-way ANOVA was used to determine differences across speeds and subjects. Submaximal V02 (ml/kg/min) was not significantly different among the four groups. Trained subjects, however, showed slightly greater efficiencythan their untrained counterparts (5 ). The V02 - running speed relationshipswere linear for all groups. Regression slopes and intercepts were not significantly different. Untrained females expended significantly more relative energy (Kcal/kg/km) than untrained males, but no more than the two trained groups. The reason for this was perhaps a combination of greater relative content and inefficient running mechanics of the untrained females. Verf.-Referat