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Inspiratory loading and limb locomotor and respiratory muscle deoxygenation during cycling exercise.
MedLine Citation:
PMID:  23228896     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The aim of this study was to determine the effect of inspiratory loading on limb locomotor (LM) and respiratory muscle (RM) deoxygenation ([deoxy (Hb+Mb)]) using NIRS during constant-power cycling exercise. Sixteen, male cyclists completed three, 6-min trials. The intensity of the first 3-min of each trial was equivalent to ∼80% V. o(2max) (EX(80%)); during the final 3-min, subjects received an intervention consisting of either moderate inspiratory loading (Load(mod)), heavy inspiratory loading (Load(heavy)), or maximal exercise (Load(EX)). Load(heavy) significantly increased LM [deoxy(Hb+Mb)] from 12.2±9.0μμm during EX(80%) to 15.3±11.7μm, and RM [deoxy(Hb+Mb)] from 5.9±3.6μm to 9.5±6.6μm. LM and RM [deoxy(Hb+Mb)] were significantly increased from EX(80%) to Load(EX); 12.8±9.1μm to 16.4±10.3μm and 5.9±2.9μm to 11.0±6.4μm, respectively. These data suggest an increase in respiratory muscle load increases muscle deoxy(Hb+Mb) and thus may indicate a reduction in oxygen delivery and/or increased oxygen extraction by the active muscles.
Authors:
Louise A Turner; Sandra Tecklenburg-Lund; Robert F Chapman; Joel M Stager; Joseph W Duke; Timothy D Mickleborough
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-7
Journal Detail:
Title:  Respiratory physiology & neurobiology     Volume:  -     ISSN:  1878-1519     ISO Abbreviation:  Respir Physiol Neurobiol     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101140022     Medline TA:  Respir Physiol Neurobiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier B.V.
Affiliation:
Human Performance Laboratory, Department of Kinesiology, Indiana University, Bloomington, Indiana; Department of Sport and Exercise Science, Northumbria University, Newcastle upon Tyne, UK.
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