A Study On The Dynamic Changes And Correlation Of VO₂,CO And Energy Expenditure During Three Brisk Walks Of Different Slopes

Objective: To study the regular pattern of dynamic changes and correlation of oxygen uptake(VO2), cardiac output(CO), and energy expenditure during the synchronized real time courses of three same speed brisk walks on the level, uphill and downhill treadmill, with heart rate(HR), rate of perceived exertion(RPE), Stroke Volume(SV) etc, to explore the characteristics of changes of cardiopulmonary parameters and aerobic capacity during brisk walks on three slopes.Methods: Ten healthy females(18-30 y/o) were selected randomly as the subjects, walking briskly on the level, uphill and downhill treadmill(h/p/cosmos) which were separated by one week, and VO2, CO, energy expenditure, HR, etc were monitored dynamically and synchronize in real time by RS400 sd heart rate telemetry and MOXUS gas metabolism analysis system during the whole experiment test.Results: 1) There were some increases in VO2, CO and energy expenditure along with the extension of walking on three slopes. 2) The increases in VO2, CO and energy expenditure during uphill walking were significantly higher than those during level walking(p < 0.05), and were significantly higher than those during downhill walking(p < 0.05), respectively. 3) There were strong linear correlation(r>0.8,p<0.01) between VO2, CO and energy expenditure during the brisk walking on the level, uphill and downhill treadmill.Conclusion: At the same speed, during brisk uphill walking, VO2, CO, energy expenditure increased significantly; proportionally the energy expenditure、 RPE、HR of subjects during uphill brisk walking is higher than that during level and downhill brisk waling, respectively, but which is easily controlled by the subjects, indicating that the speed and slope of uphill walking are suitable for the aerobic endurance exercise.