In search for a method of evaluating the cardiopulmonary function. 74 male and 33 female volunteers ages 1825 were subjected to this study
The subjects walked on a treadmill at speed of 2, 4, 6 and 8km/hr with 0, 5, 10, 15, 20 and 25%
grade of inclination, respectively, for a measurement of heart rate and oxygen-pulse.
Heart rate was measured every 5 seconds at resting state and during walking by telemetric
method using Heart Checker 108 System (Senoh Co., Japan).
Oxygen concentration was measured by Douglas bag method collecting expired air for 5 minutes at rest, and for 2 minutes at the end of each walking exercise. Oxygen concentration in an expired air was analyzed with Orzat gas analyzer and expressed in terms of STPD.
Oxygen-pulse was defined as an amount of oxygen consumed at every heart at a cellular level. The followings were the results obtained from this study.
1. Mean values of oxygen-pulse at resting state was 3. 1-1-0. iiml/beat in male and 2.5=0.87 ml/beat in female, respectively.
2. Mean values of oxygen-pulse during treadmill walking were increased in proportion with the load of exercise, namely, the speed and grade of inclination, from minimum of 7.Iml/beat upto maximum of 18.2ml/beat in male and from minimum of 4.2ml/beat upto maximum of 12.7ml/beat in female.
3. Both linear and logarithmic regressional relationships between oxygen-pulse and speed of walking and grade of inclination were observed in both sexes. Predicted values of oxygen-pulse by logarithmic regressional formula on speed and on grade of ´inclination were better coincided with the measured values than those predicted by the linear regressional formula.
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