Energy Expenditure Characteristics of Overweight Women at the Same Speed of Jogging and Walking

PURPOSE: Jogging and walking are two common exercises in overweight people. However, the relationship between energy expenditure of jogging and walking in overweight people is still not clear. This paper probes into characteristics of energy expenditure and physiology of overweight adult women at the same speed of jogging and walking. METHODS: Twenty six overweight and twenty five normal weight adult women(age: 22.0±1.6 years) participated in the study. 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. RESULTS:When the jogging speed over 7.0km/h (including 7.0km/h) and walking speed over 5.5km/h (including 5.5km/h), the net energy expenditure, energy expenditure and heart rate of overweight women were significantly higher than normal weight women(P<0.05). When walking speed was 6.0km/h, net energy expenditure(5.44±0.95vs6.51±1.65 kcal/min) and energy expenditure(6.49±0.91vs7.55±1.64 kcal/min) of overweight women were significantly lower than jogging at the speed of 6.0km/h(P<0.01). However, when walking speed was 7.0km/h, net energy expenditure(9.60±1.48vs8.69±1.57 kcal/min), energy expenditure(10.64±1.50vs9.73±1.56 kcal/min), heart rate(170±10vs158±14 BPM) and RPE(17±1vs13±2) of overweight women were significantly higher than jogging at the speed of 7.0km/h(P<0.05). CONCLUSIONS: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.