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This study examined the effect of exercise training on peak VO 2 of 26 (12 boys and 14 girls) prepubertal children. Exercise training involved 12 weeks of stationary cycling for 30 min, 3 times · week −1 at 79.3 ± 1.2% ( M ± SD) peak heart rate. Nineteen maturity matched controls (10 boys and 9 girls) completed all tests excluding the training. When alterations in habitual physical activity and percent body fat were included as covariates in the analyses, the exercise training did not have a significant effect on peak VO 2 for boys or girls. These data may either indicate a maturity related, blunted training response or that prepubertal children require a more intense exercise stimulus.
Tolfrey et al. (Sat,) studied this question.