Recovery of upper-body muscle power after short intensive exercise: comparing boys and men

Boys' lower-body muscle power generation (PO) recovers faster than men's following intensive exercise. The purpose of this study was to examine whether boys differ from adult men in recovering from upper-body muscle power generation following intensive exercise. Fifteen prepubertal boys (M +/- SD age 10.6 +/- 1.0 years) and 13 men (31.1 +/- 5.0 years) performed two upper-body Wingate Anaerobic Tests (WAnT), separated by either 2-min or 10-min recovery intervals. WAnT parameters, pre-and post-WAnT heart rates (HR), and blood lactate ([La]) were measured during recovery from the WAnTs. Boys' mean power (MP) of the repeated WAnT (WAnT(2)) following 2- and 10-min recoveries was 97.3 +/- 7.2% and 99.4 +/- 3.9%, respectively, compared to MP of the first test (WAnT(1)) (p > 0.05 for both tests). In contrast, in men's MP of the WAnT(2) following the 2-min recovery, was significantly lower than that of the WAnT(1) (84.4 +/- 6.7%, p = 0.0001). While boys' and men's HR recovery after 2 min differed significantly (p = 0.046), no between-group differences were found following the 10-min recovery. Peak [La] in boys was 37-44% lower than that in men (p = 0.002). The faster recovery of PO in boys after supra-maximal upper-body exercise is partially explained by the lower power generated by boys, attributed in part to a lower anaerobic capacity and to the greater relative contribution of aerobic processes to performance and recovery from anaerobic-type tasks. Further research is needed to determine the physiologic, neurologic and biochemical basis of the rapid muscle power recovery in children.