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Medicine & Science in Sports:
Cardiac output differences in males and females during mild cycle ergometer exercise: PDF Only

Cardiac output differences in males and females during mild cycle ergometer exercise.

FREEDSON, PATTY; KATCH, VICTOR L.; SADY, STANLEY; WELTMAN, ARTHUR

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Abstract

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

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