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Faster pulmonary oxygen uptake kinetics in children vs adults due to enhancements in oxygen delivery and extraction.
MedLine Citation:
PMID:  22353227     Owner:  NLM     Status:  Publisher    
This study aimed to examine if the faster pulmonary oxygen uptake (VO(2p) ) phase 2 in children could be explained by increased O (2) availability or extraction at the muscle level. For that purpose, O (2) availability and extraction were assessed using deoxyhemoglobin (HHb) estimated by near-infrared spectroscopy during moderate-intensity constant load cycling exercise in children and young adults. Eleven prepubertal boys and 12 men volunteered to participate in the study. They performed one maximal graded exercise to determine the power associated with the gas exchange threshold (GET) and four constant load exercises at 90% of GET. VO(2p) and HHb were continuously monitored. VO(2p) , HHb, and estimated capillary blood flow ( Q ˙ cap ) kinetics were modelled after a time delay and characterized by the time to achieve 63% of the amplitude (τ) and by mean response time (MRT: time delay + τ), respectively. Mean values of τ for VO(2p) (P < 0.001), of MRT for HHb (P < 0.01) and of MRT for Q ˙ cap (P < 0.001) were significantly shorter in children. Faster VO(2p) kinetics have been shown in children; these appear due to both faster O (2) extraction and delivery kinetics as indicated by faster HHb and Q ˙ cap kinetics, respectively.
E Leclair; S Berthoin; B Borel; D Thevenet; H Carter; G Baquet; P Mucci
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-21
Journal Detail:
Title:  Scandinavian journal of medicine & science in sports     Volume:  -     ISSN:  1600-0838     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9111504     Medline TA:  Scand J Med Sci Sports     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 John Wiley & Sons A/S.
Laboratory of Human Movement Studies - EA4488, University Lille Nord de France, Lille, France; School of Kinesiology and Health Science, Faculty of Health, York University, Toronto, Ontario, Canada.
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