FREEDSON, PATTY, VICTOR L. KATCH, STANLEY SADY, and ARTHUR WELTMAN. Cardiac output differences in males and females during mild cycle ergometer exercise. Med. Sci. Sports. Vol. 11, No. 1, pp. 16-19, 1979. To study sex differences in cardiac output during submaximum exercise, eight male and eight female subjects were matched on max [latin capital V with dot above]o2 (1 min-1 and ml kg-1min-1). Each subject performed one, eight minute submaximum bicycle ergometer test at 35% of [latin capital V with dot above]o2max (300 kpm min-1). At a steady state mean [latin capital V with dot above]o2 of 0.96 1 min-1, cardiac output was determined. Significant differences between men and women were observed (p<.05) in cardiac output, stroke volume and (a-v) O2 difference. The males had a lower cardiac output (1.75 1 min-1) and stroke volume (17.2 ml beat-1) and a higher (a-v) O2 difference (2.01 vol %). When these variables were expressed independent of lean body weight the above differences were non-significant. It was suggested that cardiac output differences between the sexes during mild exercise are due, in part, to differences in lean body weight.
CARDIAC OUTPUT, (A-V) O2 DIFFERENCES, STROKE VOLUME, SEX DIFFERENCES, EXERCISE, LEAN BODY MASS
(C)1979The American College of Sports Medicine