Author(s)
Melitta A. Winlove, Andrew M. Jones, Joanne R. Welsman
Date
2010-04-05
Source
European Journal of Applies Physiology. April 2010, Volume 108, Issue 6, pp 1169-1179

The limited available evidence suggests that endurance training does not influence the pulmonary oxygen uptake ( V˙O2 ) kinetics of pre-pubertal children. We hypothesised that, in young trained swimmers, training status-related adaptations in the V˙O2 and heart rate (HR) kinetics would be more evident during upper body (arm cranking) than during leg cycling exercise. Eight swim-trained (T; 11.4 ± 0.7 years) and eight untrained (UT; 11.5 ± 0.6 years) girls completed repeated bouts of constant work rate cycling and upper body exercise at 40% of the difference between the gas exchange threshold and peak V˙O2 . The phase II V˙O2 time constant was significantly shorter in the trained girls during upper body exercise (T: 25 ± 3 vs. UT: 37 ± 6 s; P < 0.01), but no training status effect was evident in the cycle response (T: 25 ± 5 vs. UT: 25 ± 7 s). The V˙O2 slow component amplitude was not affected by training status or exercise modality. The time constant of the HR response was significantly faster in trained girls during both cycle (T: 31 ± 11 vs. UT: 47 ± 9 s; P < 0.01) and upper body (T: 33 ± 8 vs. UT: 43 ± 4 s; P < 0.01) exercise. The time constants of the phase II V˙O2 and HR response were not correlated regardless of training status or exercise modality. This study demonstrates for the first time that swim-training status influences upper body V˙O2 kinetics in pre-pubertal children, but that cycle ergometry responses are insensitive to such differences.

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