Titre :

Heterogeneity of muscle deoxygenation kinetics during two bouts of repeated heavy exercises.

Auteur(s) :

Prieur, Fabrice [Auteur]
Université d'Artois [UA]
Berthoin, Serge [Auteur]
Unité de Recherche Pluridisciplinaire Sport, Santé, Société (URePSSS) - ULR 7369
Marles, Alexandre [Auteur]
Université d'Artois [UA]
Blondel, Nicolas [Auteur]
Unité de Recherche Pluridisciplinaire Sport, Santé, Société (URePSSS) - ULR 7369
Mucci, Patrick [Auteur]
Unité de Recherche Pluridisciplinaire Sport, Santé, Société (URePSSS) - ULR 7369

Titre de la revue :

European Journal of Applied Physiology

Nom court de la revue :

Eur J Appl Physiol

Numéro :

109

Pagination :

1047-57

Date de publication :

2010-08-01

ISSN :

1439-6327

Mot(s)-clé(s) en anglais :

Humans
Kinetics
Male
Metabolic Clearance Rate
Muscle Contraction
Muscle, Skeletal
Oxygen
Oxygen Consumption
Physical Endurance
Physical Exertion
Young Adult

Discipline(s) HAL :

Sciences du Vivant [q-bio]

Résumé en anglais : [en]

This study examines the effect of prior heavy exercise on the spatial distribution of muscle deoxygenation kinetics at the onset of heavy-intensity cycling exercise. Young untrained male adults (n = 16) performed two ...
Lire la suite >This study examines the effect of prior heavy exercise on the spatial distribution of muscle deoxygenation kinetics at the onset of heavy-intensity cycling exercise. Young untrained male adults (n = 16) performed two consecutive bouts of 6 min of high intensity cycle exercise separated by 6 min at 35 W. Muscle deoxygenation (HHb) was monitored continuously by near-infrared spectroscopy at eight sites in the quadriceps. Prior heavy exercise reduced the delay before the increase in HHb (9 +/- 2 vs. 5 +/- 2 s; P < 0.001). The standard deviation of TD HHb of the eight sites was decreased by the performance of prior exercise (1.1 +/- 0.5 vs. 0.8 +/- 0.4 s; P < 0.05). The transient decrease in HHb during the first 10 s of exercise was less during the second bout than during the first bout (0.6 +/- 0.6 vs. 0.3 +/- 0.3 A.U.; P < 0.01). The standard deviation of this decrease was also reduced by prior exercise (0.5 +/- 0.3 vs. 0.3 +/- 0.2 A.U.; P < 0.01). Lastly, prior exercise decreased significantly the standard deviation of the HHb rise during the time period corresponding to the pulmonary VO(2) slow component. These results indicate that prior heavy exercise reduced the spatial heterogeneity of muscle deoxygenation kinetics at the early onset of heavy exercise and during the development of the pulmonary VO(2) slow component. It indicates that the distribution of the VO(2)/O(2) delivery ratio within muscle was improved by the performance of a prior exercise.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Non spécifiée

Établissement(s) :

Université de Lille
Univ. Artois
Univ. Littoral Côte d’Opale

Collections :

• Unité de Recherche Pluridisciplinaire Sport, Santé, Société (URePSSS) - ULR 7369

Équipe(s) de recherche :

Activité Physique, Muscle, Santé (APMS)

Date de dépôt :

2021-11-14T07:18:07Z
2021-12-01T11:23:59Z