Oxygen uptake kinetics in trained adolescent females

Viswanath B. Unnithan, Denise M. Roche, Max Garrard, Kathryn Holloway, Simon Marwood

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Little evidence exists with regard to the effect that exercise training has upon oxygen uptake kinetics in adolescent females.

PURPOSE: The aim of the study was to compare [Formula: see text] and muscle deoxygenation kinetics in a group of trained (Tr) and untrained (Utr) female adolescents.

METHOD: Twelve trained (6.4 ± 0.9 years training, 10.3 ± 1.4 months per year training, 5.2 ± 2.0 h per week) adolescent female soccer players (age 14.6 ± 0.7 years) were compared to a group (n = 8) of recreationally active adolescent girls (age 15.1 ± 0.6 years) of similar maturity status. Subjects underwent two, 6-min exercise transitions at a workload equivalent to 80 % of lactate threshold from a 3-min baseline of 10 W. All subjects had a passive rest period of 1 h between each square-wave transition. Breath-by-breath oxygen uptake and muscle deoxygenation were measured throughout and were modelled via a mono-exponential decay with a delay relative to the start of exercise.

RESULT: Peak [Formula: see text] was significantly (p < 0.05) greater in the Tr compared to the Utr (Tr: 43.2 ± 3.2 mL kg(-1 )min(-1) vs. Utr: 34.6 ± 4.0 mL kg(-1 )min(-1)). The [Formula: see text] time constant was significantly (p < 0.05) faster in the Tr compared to the Utr (Tr: 26.3 ± 6.9 s vs. Utr: 35.1 ± 11.5 s). There was no inter-group difference in the time constant for muscle deoxygenation kinetics (Tr: 8.5 ± 3.0 s vs. Utr: 12.4 ± 8.3 s); a large effect size, however, was demonstrated (-0.804).

CONCLUSION: Exercise training and/or genetic self-selection results in faster kinetics in trained adolescent females. The faster [Formula: see text] kinetics seen in the trained group may result from enhanced muscle oxygen utilisation.

Original languageEnglish
Pages (from-to)213-220
Number of pages8
JournalEuropean Journal of Applied Physiology
Volume115
Issue number1
Early online date1 Oct 2014
DOIs
Publication statusPublished - Jan 2015
Externally publishedYes

Keywords

  • Adolescent
  • Athletes
  • Case-Control Studies
  • Exercise
  • Female
  • Humans
  • Oxygen Consumption
  • Journal Article

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