Korean J Prev Med.  1984 Sep;17(1):281-288.

Changes in Oxygen-Pulse During Treadmill Walking

• Lee CH
• Chung KC

Abstract

In search for a method of evaluating the cardiopulmonary function. 74 male and 33 female volunteers ages 18~25 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+/-0.11 ml/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 7.1 ml/beat upto maximum of 18.2 ml/beat in male and from minimum of 4.2 ml/beat upto maximum of 12.7 ml/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.

MeSH Terms

Female
Heart
Heart Rate
Humans
Linear Models
Male
Oxygen
Volunteers
Walking*
Oxygen