Energy Expenditure Comparison of Overweight Adult Women at the Same Speed Gradient of Walking and Jogging

This paper probes into characteristics of energy consumption and physiology of overweight adult women at the same speed gradient of walking and jogging.The subjects were overweight and normal weight adult women.Their maximal oxygen uptake was measured by a maximal treadmill exercise test using a modified Bruce protocol.The resting energy expenditure and the energy expenditure of overground walking and jogging were measured by Cortex portable gas metabolism system.The overground walking speed from low to high were 4.0km/h,4.5km/h,5.0km/h,5.5km/h,6.0km/h,6.5km/h and 7.0km/h.The overground jogging speed were 6.0km/h,7.0km/h and 8.0km/h.The duration of each speed was 6 minutes.Net energy expenditure of each speed was calculated as energy expenditure minus resting energy expenditure.The result showed that when the walking speed over 5.5km/h(including 5.5km/h)and jogging speed over 7.0km/h(including 7.0km/h),the energy expenditure,net energy expenditure and heart rate of overweight women were significantly higher than normal weight women(P<0.05,P<0.01).When walking speed was 6.0km/h,energy expenditure and net energy expenditure of overweight women were significantly lower than jogging at the speed of 6.0km/h(P<0.05,P<0.01).However,when walking speed was 7.0km/h,energy expenditure,net energy expenditure,heart rate and RPE of overweight women were significantly higher than jogging at the speed of 7.0km/h(P<0.05,P<0.01).These results demonstrate that the differences of BMI will result in differentiations of energy consumption and physiological indexes of women when walking and jogging at a certain speed.When speed reach and exceed 7.0km/h,walking will consume more energy than jogging.As far as the weight control of overweight people is concerned,the effect of walking at this speed is better than that of jogging.