Faster Pulmonary Oxygen Uptake Kinetics in Trained versus Untrained Male Adolescents

Marwood, Simon and Roche, Denise and Rowland, Thomas and Garrard, Max and Unnithan, Viswanath B. (2010) Faster Pulmonary Oxygen Uptake Kinetics in Trained versus Untrained Male Adolescents. Medicine & Science in Sports & Exercise, 42 (1). pp. 127-134. ISSN 0195-9131

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Exercise training results in a speeding of pulmonary oxygen uptake (V˙ O2) kinetics at the onset of exercise in adults; however, only limited research has been conducted with children and adolescents. Purpose: The aim of the present study was to examine V˙ O2 and muscle deoxygenation
kinetics in trained and untrained male adolescents. Methods: Sixteen trained (15 T 0.8 yr, V˙ O2peak = 54.7 T 6.2 mLIkgj1Iminj1, selfassessed Tanner stage range 2–4) and nine untrained (15 T 0.6 yr, V˙ O2peak = 43.1 T 5.2 mLIkgj1Iminj1, Tanner stage range 2–4) male
adolescents performed two 6-min exercise transitions from a 3-min baseline of 10 W to a workload equivalent to 80% lactate threshold separated by a minimum of 1 h of passive rest. Oxygen uptake (breath-by-breath) and muscle deoxygenation (deoxyhemoglobin signal from near-infrared spectroscopy) were measured continuously throughout baseline and exercise transition. Results: The time constant
of the fundamental phase of V˙ O2 kinetics was significantly faster in trained versus untrained subjects (trained: 22.3 T 7.2 s vs untrained:29.8 T 8.4 s, P = 0.03). In contrast, neither the time constant (trained: 9.7 T 2.9 s vs untrained: 10.1 T 3.4 s, P = 0.78) nor the mean
response time (trained: 17.4 T 2.5 s vs untrained: 18.3 T 2.3 s, P = 0.39) of muscle deoxygenation kinetics differed with training status.
Conclusions: The present data suggest that exercise training results in faster V˙ O2 kinetics in male adolescents, although inherent capabilities cannot be ruled out. Because muscle deoxygenation kinetics were unchanged, it is likely that faster V˙ O2 kinetics were due
to adaptations to both the cardiovascular system and the peripheral musculature.

Item Type: Article
Additional Information and Comments: This is a non-final version of an article published in final form in (Medicine & Science in Sports & Exercise: January 2010 - Volume 42 - Issue 1 - pp 127-134)
Subjects: Q Science > QP Physiology
Faculty / Department: Faculty of Science > School of Health Sciences
Depositing User: Susan Murray
Date Deposited: 06 Mar 2014 15:47
Last Modified: 12 Jul 2016 11:42

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