Cardiopulmonary Responses of Male and Female Subjects to Submaximal Work on Laddermill and Cycle Ergometer

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Abstract
Twelve male and 9 female normal subjects climbod up a motor-driven ladder and of this group 9 males and 6 females also pedalled a cycle ergometer all at submaximal work loads. For climbing the ladder at inclination of 30° from vertical the whole body oxygen uptake was linearly related to both work rate in kg m and body weight in kg with the regression coefficients for work rate higher and for body weight lower for males than for females. No correlation with body weight was apparent for cycling and the regression coefficient for work rate was found to be practically the same for males and females. For climbing the ladder at 10° inclination the regression coefficient for work rate was smaller but the constant in the regression equation was larger as compared to 30° inclination. Work efficiency calculated from the regression coefficient of the work rate was about 25% for both climbing and cycling. Ventilation was found to be independent of body weight on both ergometers. The linearity of ventilation and heart rates on work rate were also applied to oxygen, uptake and revealed somewhat steeper regressions for females than for males.