Document Detail

Respiratory muscle oxygenation kinetics: relationships with breathing pattern during exercise.
MedLine Citation:
PMID:  16838222     Owner:  NLM     Status:  MEDLINE    
This work aimed to investigate accessory respiratory muscle oxygenation (RMO(2)) during exercise, using near-infrared spectroscopy, and to study relationships between RMO(2) kinetics and breathing parameters. Nineteen young males (19.3 +/- 1.5 years) performed a maximal incremental test on a cycle ergometer. Changes in breathing pattern were characterized by accelerated rise in the breathing frequency (f (Racc)), plateau of tidal volume (V (Tplateau)) and inflection point in the V. (E)/V (T) relationship (V. (E)/V (T inflection)). First and second ventilatory thresholds (VT1 and VT2) were also determined. RMO (2) kinetics were monitored by NIRS on the serratus anterior. During exercise, all subjects showed reduced RMO (2) (deoxygenation) with a breakdown (B-RMO(2)) at submaximal workload (86 % .VO(2max)). .VO(2) corresponding to B-RMO (2) and to f (Racc), V (Tplateau), .V(E)/V(T inflection), or VT2 were not different. Relationships were found between the .VO(2) at B-RMO(2) and the .VO(2) at f (Racc) (r = 0.88, p < 0.001), V (Tplateau) (r = 0.84, p < 0.001), V. (E)/V (T inflection) (r = 0.58, p < 0.05) or VT2 (r = 0.79, p < 0.001). The amplitude of RMO(2) at maximal workload was weakly related to .VO(2max) (r = 0.58, p < 0.05). B-RMO (2) seems to be due to the change in breathing pattern and especially to the important rise in breathing frequency at the VT2 exercise level. Moreover, subjects who exhibit higher .VO(2max) also exhibit a higher decrease in respiratory muscle oxygenation during exercise.
R Legrand; F Prieur; A Marles; C Nourry; S Lazzari; N Blondel; P Mucci
Publication Detail:
Type:  Journal Article     Date:  2006-07-12
Journal Detail:
Title:  International journal of sports medicine     Volume:  28     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-02-09     Completed Date:  2007-04-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  91-9     Citation Subset:  IM    
Laboratoires d'Etudes de la Motricité Humaine EA 3608, Faculté des Sciences du Sport et de l'Education Physique, Université de Lille 2, Ronchin, France.
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MeSH Terms
Blood Volume / physiology
Exercise Test
Oxygen / metabolism*
Oxygen Consumption / physiology*
Physical Exertion / physiology
Pulmonary Gas Exchange / physiology
Respiratory Muscles / blood supply,  metabolism*
Spectroscopy, Near-Infrared
Tidal Volume / physiology
Reg. No./Substance:

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