Longitudinal change in the oxygen uptake kinetic response to heavy-intensity exercise in 14- to 16-years-old boys.

摘要

This study examined longitudinal changes in the pulmonary oxygen uptake (pVO_2) kinetic response to heavy-intensity exercise in 14-16 yr old boys. Fourteen healthy boys (age 14.1 +- 0.2 yr) completed exercise testing on two occasions with a 2-yr interval. Each participant completed a minimum of three 'step' exercise transitions, from unloaded pedalling to a constant work rate corresponding to 40% of the difference between the pVO_2 at the gas exchange threshold and peak pVO_2 (40% A). Over the 2-yr period a significant increase in the phase II time constant (25 +- 5 vs. 30 +- 5 s; p = .002, omega~2 = 0.34), the relative amplitude of the pVO_2 slow component (9 +- 5 vs. 13 +- 4%; p = .036, co2 = 0.14) and the pVO_2 gain at end-exercise (11.6 +-0.6 vs. 12.4 +- 0.7 mL-min~(-1)W~(-1); p < .001, omega~2 = 0.42) were observed. These data indicate that the control of oxidative phosphorylation in response to heavy-intensity cycling exercise is age-dependent in teenage boys.