oxygen consumption during moderate-intensity interval exercise in overweight young adults

Background: overweight and obesity have become a problem for younger generations, so weight management must be introduced. moderate-intensity interval training (miit) has been recommended for aging and obese populations because it is friendly and accessible. however, little information is known about the physiological response during moderate-interval intensity exercise, especially for overweight and obese persons. objectives: to evaluate cardiorespiratory alteration upon a single bout of miit exercise among sedentary, overweight young thai adults. methods: fifteen overweight young adults (8 males and 7 females, body mass index between 25.0 - 29.9 kg/m 2, aged between 18 - 25 years) underwent cycling ergometry for 45 minutes (warm-up 5 minutes; 3 × 5 minutes at 20 - 40% of heart rate reserve and 5 minutes at 50 - 60%; cool down 10 minutes). a gas analyzer and limb lead electrocardiogram were used to record oxygen consumption (v̇o 2), heart rate (hr), and dioxide production (v̇co 2) throughout the experiment. results: during the 45-minute miit exercise protocol, the participants consumed 25.1 ± 8.1 l, equal to approximately 530 ± 171 kj. as expected, heart rate, o 2uptake, and co 2production increased during moderated-intensity exercise and declined during low-intensity exercise. a low to moderate duration ratio of 1: 1 was sufficient to return both o 2consumption and co 2production to their stage level, but not for heart rate. although there was a very linear relationship between v̇o 2and heart rate for the overall period (0.761 ± 0.090), the correlation was weaker when selectively computed during low (0.549 ± 0.161) or moderate exercises (0.658 ± 0.105). interestingly, rer larger than one during moderate-intensity exercise indicated the possibility of high acid accumulation. conclusions: the miit protocol in the present study provided a responsive effect on overweight persons toward anaerobic metabolism but was a little aggressive.