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Objective: The objective of this study is to evaluate the effects of 12 weeks high-intensity interval training(HIIT) on the body composition of obese adolescent girls in China. Methodology: This was a single-center, randomized, multiple repeated-measures controlled trial (RCT), 36 girls aged 12-14 years were randomized into 1 interventional groups (HIIT group) or 1 control group (no training). In the HIIT group, set 100% MAS as the load intensity, and 50% MAS as interval intensity. A 15-second running (intensity of 100% MAS), followed by a 15-second walking (intensity of 50% MAS), which was regarded as 1 bout, each set includes 8 bouts, 4 sets each time, 3 minutes' rest between sets, 25 minutes of interval training time, plus warm-up and cooling time, the total training time was 35 minutes. Intervention period is 12 weeks; the frequency was three times a week. In the dependent variable of this study, there were 9 body composition indicators, including 5 anthropological indexes (height, weight, BMI, waist circumference, and hip circumference) and 4 fat-related indexes (body fat percentage, total fat mass, free fat mass, and visceral adipose tissue). All dependent variables were measured at baseline, 6th weeks and 12th week. To examine the effect of the intervention on the outcomes of interest, Generalized Estimating Equation (GEE) was used. Results: 31 girls completed the 12-week intervention. 15 in the HIIT group and 16 in the control group. Results of GEE showed weight, BMI, WC, hipline, BF%, FM, and VAT in the HIIT group decreased statistically over time, and were significantly different from those in the control group. The FFM showed a statistically significant increase over time in the HIIT group, and was significantly different from the control group. Conclusion: 12 weeks HIIT protocols can improve body composition of obese adolescent girls in China.
Wang et al. (Sun,) studied this question.