Pulmonary oxygen uptake and muscle deoxygenation kinetics during recovery in trained and untrained male adolescents

Marwood, Simon and Roche, Denise and Garrard, Max and Unnithan, Viswanath B. (2011) Pulmonary oxygen uptake and muscle deoxygenation kinetics during recovery in trained and untrained male adolescents. European Journal of Applied Physiology, 111 (11). pp. 2775-2784. ISSN 1439-6319

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Previous studies have demonstrated faster pulmonary oxygen uptake ( V ˙ O 2 ) kinetics in the trained state during the transition to and from moderate-intensity exercise in adults. Whilst a similar effect of training status has previously been observed during the on-transition in adolescents, whether this is also observed during recovery from exercise is presently unknown. The aim of the present study was therefore to examine V ˙ O 2 kinetics in trained and untrained male adolescents during recovery from moderate-intensity exercise. 15 trained (15 ± 0.8 years, V ˙ O 2max 54.9 ± 6.4 mL kg−1 min−1) and 8 untrained (15 ± 0.5 years, V ˙ O 2max 44.0 ± 4.6 mL kg−1 min−1) male adolescents performed two 6-min exercise off-transitions to 10 W from a preceding “baseline” of exercise at a workload equivalent to 80% lactate threshold; V ˙ O 2 (breath-by-breath) and muscle deoxyhaemoglobin (near-infrared spectroscopy) were measured continuously. The time constant of the fundamental phase of V ˙ O 2 off-kinetics was not different between trained and untrained (trained 27.8 ± 5.9 s vs. untrained 28.9 ± 7.6 s, P = 0.71). However, the time constant (trained 17.0 ± 7.5 s vs. untrained 32 ± 11 s, P < 0.01) and mean response time (trained 24.2 ± 9.2 s vs. untrained 34 ± 13 s, P = 0.05) of muscle deoxyhaemoglobin off-kinetics was faster in the trained subjects compared to the untrained subjects. V ˙ O 2 kinetics was unaffected by training status; the faster muscle deoxyhaemoglobin kinetics in the trained subjects thus indicates slower blood flow kinetics during recovery from exercise compared to the untrained subjects.

Item Type: Article
Additional Information and Comments: “The final publication is available at link.springer.com”
Keywords: V ˙ O 2, off-kinetics, Near-infrared spectroscopy Muscle deoxyhaemoglobin, Training, Asymmetry
Subjects: Q Science > QP Physiology
Faculty / Department: Faculty of Science > School of Health Sciences
Depositing User: Susan Murray
Date Deposited: 06 Mar 2014 09:36
Last Modified: 06 Mar 2014 17:19
URI: http://hira.hope.ac.uk/id/eprint/309

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