OBJECTIVE: The objective of this study is to analyze the effects of a 12-week indoor intermittent training program on lung function, physical capacity, body composition and quality of life in children with asthma. METHODS: Participants were randomized in an experimental group (EG, 58 children, age 11.55 +/- 1.01 years) and in a control group (CG, 47 children, age 11.51+/- 1.42 years). The training program was conducted indoors and consisted of alternating high- and low-intensity stimuli, for three sessions of 60 min/week, for 12 weeks. Physical exercise and sports activities were organized to follow the criteria of the American College of Sports Medicine (1999) and previous interventions' studies. RESULTS: In EG, there was a significant improvement (p < 0.05) in FEV1, FEV6, 6MWT, handgrip strength, CMJ and flexibility. Reductions in BMI and fat mass as well as an increase in quality of life were all shown. The dyspnea index decreased significantly and there were no episodes of EIA. There is a significant positive correlation (p < 0.01) between the FEV1 with handgrip strength and 6MWT and a negative correlation with fat mass. CONCLUSIONS: An indoor intermittent training program with these characteristics has improved lung function, physical capacity, body composition and quality of life in children with asthma. These training adaptations are particularly relevant for those patients suffering from asthma as a regular physical exercise routine will greatly improve their quality of life.

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