Document Detail

Longitudinal changes in the oxygen uptake kinetic response to heavy-intensity exercise in 14- to 16-year-old boys.
MedLine Citation:
PMID:  20332541     Owner:  NLM     Status:  MEDLINE    
This study examined longitudinal changes in the pulmonary oxygen uptake (pVO(2)) kinetic response to heavy-intensity exercise in 14-16 yr old boys. Fourteen healthy boys (age 14.1 +/- 0.2 yr) completed exercise testing on two occasions with a 2-yr interval. Each participant completed a minimum of three 'step' exercise transitions, from unloaded pedalling to a constant work rate corresponding to 40% of the difference between the pVO(2) at the gas exchange threshold and peak pVO(2) (40% Delta). Over the 2-yr period a significant increase in the phase II time constant (25 +/- 5 vs. 30 +/- 5 s; p = .002, omega(2) = 0.34), the relative amplitude of the pVO(2) slow component (9 +/- 5 vs. 13 +/- 4%; p = .036, omega(2) = 0.14) and the pVO(2) gain at end-exercise (11.6 +/- 0.6 vs. 12.4 +/- 0.7 mL x min(-1) x W(-1); p < .001, omega(2) = 0.42) were observed. These data indicate that the control of oxidative phosphorylation in response to heavy-intensity cycling exercise is age-dependent in teenage boys.
Brynmor C Breese; Craig A Williams; Alan R Barker; Joanne R Welsman; Samantha G Fawkner; Neil Armstrong
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pediatric exercise science     Volume:  22     ISSN:  0899-8493     ISO Abbreviation:  Pediatr Exerc Sci     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-03-24     Completed Date:  2011-01-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8909729     Medline TA:  Pediatr Exerc Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  69-80     Citation Subset:  IM    
Children's Health and Exercise Research Center, University of Exeter, Exeter, UK.
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MeSH Terms
Age Factors
Bicycling / physiology*
Confidence Intervals
Exercise Tolerance
Isometric Contraction / physiology*
Longitudinal Studies
Mitochondria, Muscle / physiology*
Mitochondrial Proteins
Muscle, Skeletal / physiology*
Oxidative Phosphorylation*
Oxygen Consumption / physiology*
Protein Biosynthesis
Time Factors
Reg. No./Substance:
0/Mitochondrial Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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