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Effect of physical exercise on the cardiorespiratory response in overweight adolescents
Silva DAS, Petroski EL, Pelegrini A, Guglielmo LGA
Turkish Journal of Endocrinology and Metabolism 2012;16(1):14-18
clinical trial
4/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

PURPOSE: To evaluate the effects of an aerobic physical exercise program on the metabolic and cardiorespiratory response in overweight adolescents. MATERIAL(S) AND METHOD(S): This is a randomized study evaluating overweight adolescents divided into intervention and control groups before and after an aerobic exercise program. Pre- and post-intervention aerobic fitness was evaluated by a submaximal incremental test on a cycle ergometer. The training program lasted 12 weeks, when the intervention group exercised three times per week on a cycle ergometer at individual training intensities corresponding to lactate threshold (LT) and onset of blood lactate accumulation (OBLA). The individual workload was increased by 10% at 2-week intervals. RESULT(S): After intervention, an increase in workload levels corresponding to LT (33.3%) and OBLA (14.2%) was observed in the intervention group. In addition, the intervention group reached LT training intensity at a heart rate higher than that observed before intervention and that of controls (p < 0.05). DISCUSSION(S): The program resulted in positive changes in aerobic fitness and heart rate, improving exercise tolerance.

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