Abstract
The limited available evidence suggests that endurance training does not influence the pulmonary oxygen uptake (\( \dot{V}{\text{O}}_{2} \)) kinetics of pre-pubertal children. We hypothesised that, in young trained swimmers, training status-related adaptations in the \( \dot{V}{\text{O}}_{2} \) 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 \( \dot{V}{\text{O}}_{2} \). The phase II \( \dot{V}{\text{O}}_{2} \) 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 \( \dot{V}{\text{O}}_{2} \) 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 \( \dot{V}{\text{O}}_{2} \) 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 \( \dot{V}{\text{O}}_{2} \) kinetics in pre-pubertal children, but that cycle ergometry responses are insensitive to such differences.
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Winlove, M.A., Jones, A.M. & Welsman, J.R. Influence of training status and exercise modality on pulmonary O2 uptake kinetics in pre-pubertal girls. Eur J Appl Physiol 108, 1169–1179 (2010). https://doi.org/10.1007/s00421-009-1320-2
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DOI: https://doi.org/10.1007/s00421-009-1320-2