Oxygen Uptake and Energy Expenditure During Hori zontal Treadmill Running

investigation was to compare linear and curvilinear regression equations relating oxygen uptake and energy expenditure to running velocity and to examine the effects of age, sex, and maximal aerobic power on these relations in well-conditioned male and female runners. One-variable linear equations that use running velocity as the independent variable for predicting oxygen uptake and energy expenditure had coefficients of de-termination (4) of 0.86 and 0.897, respectively. Two-variable linear equations that use body mass and velocity as independent variables had r ” values of 0.895 and 0.901 for the same relation. Age, sex, and maximal aerobic power did not influence the relations between oxygen uptake, energy expenditure, and run-ning velocity. Stepwise regression indicated that the two-vari-able linear equations had the highest 9 values suggesting that between the running velocities of 8.8 and 16.9 km. h-l these equations best express the relation of oxygen uptake and energy expenditure to running velocity. running velocity; linear and curvilinear regression equations INTEREST IN THE RELATION between oxygen uptake and running velocity extends to an initial study con-ducted by Sargent in 1926 (23). Since that time numerou