Abstract:

Objective To explore the effects of aerobic exercise (AE),strength training(ST) and aerobic exercise combined with strength training (AE+ST) on the obese teenagers,and to provide the evidence for special exercise prescription in the obese teenagers. Methods Sixty obese teenagers were randomly divided into AE group(n=15),ST group (n=15),AE＋ST group(n=15) and control group (n=15).The subjects in AE group performed 8-week AE,and the subjects in ST group did ST,and the subjects in AE＋ST group conducted AE+ST.The body weights,body mass indexes (BMI),percentage of body fat (BF%),fat mass (FM),lean body mass (LBM),serum expression levels of interleukin-6 (IL-6),IL-18,tumor necrosis factor-α (TNF-α),C-reaction protein (CRP),maximal oxgen uptake (VO_2max),exhaust time (ET) and maximal power (MP) of the subjects were determined before and after the experiment. Results There were no significantly differences of the indexes between the patients in four groups before experiment (P>0.05).Compared with before experiment,the body weight,BMI,FM,BF% and IL-18 level of the subjects were reduced (P<0.05 or P<0.01) while the VO_2max,ET and MP were elevated (P<0.01) in AE group;the BF% was decreased (P<0.05) while the FFM and TNF-α level were increased (P<0.05 or P<0.01) in ST group;the body weight,BMI,FM,BF%, and IL-18 level were reduced (P<0.05 or P<0.01) while the FFM,VO_2max,ET and MP were elevated (P<0.05 or P<0.01) in AE+ST group. Compared with control group,the body weight,BMI,FM,BF% and IL-18 level were reduced (P<0.05 or P<0.01) while the VO_2max,ET, and MP were elevated (P<0.01) in AE group;the BF% was decreased (P<0.05) while the FFM and TNF-α level were increased (P<0.05 or P<0.01) in ST group;the body weight,BMI,FM,BF% and IL-18 level were reduced (P<0.05 or P<0.01) while the FFM,VO_2max,ET and MP were elevated (P<0.05 or P<0.01) in AE+ST group. Compared with AE group,the IL-18 level was reduced in AE+ST group (P<0.01). Conclusion All exercise modes can improve the body composition,while AE or AE combined with ST can ameliorate the chronic inflammatory reaction state and enhance the exercise capacity.The effect of AE combined with ST is superior to single AE.

Key words: obese, teenagers, training, body composition, inflammatory factors, exercise capacity