AustralieFrV1, Main, Exploration, bibRecord, 008D65

Effects of high-intensity training on muscle lactate transporters and postexercise recovery of muscle lactate and hydrogen ions in women

Identifieur interne : 008D65 ( Main/Exploration ); précédent : 008D64; suivant : 008D66

Effects of high-intensity training on muscle lactate transporters and postexercise recovery of muscle lactate and hydrogen ions in women

Auteurs : David Bishop [Australie, Italie] ; Johann Edge [Nouvelle-Zélande] ; Claire Thomas [France] ; Jacques Mercier [France]

Source :

American journal of physiology. Regulatory, integrative and comparative physiology [ 0363-6119 ] ; 2008.

RBID : Pascal:09-0057397

Descripteurs français

Pascal (Inist)
- Intensité élevée, Muscle, Récupération, Lactate, Ion hydrogène, Femelle, pH, In vitro, Intracellulaire, Capacité, Exercice physique, Biopsie, Homme, Transporteur monocarboxylate.
Wicri :
- topic : Homme.

English descriptors

KwdEn :
- Biopsy, Capacity, Female, High intensity, Human, Hydrogen ion, In vitro, Intracellular, Lactates, Monocarboxylate transporter, Muscle, Physical exercise, Recovery, pH.

Abstract

-The purpose of this study was to investigate the effects of high-intensity interval training (3 days/wk for 5 wk), provoking large changes in muscle lactate and pH, on changes in intracellular buffer capacity (βm_in vitro), monocarboxylate transporters (MCTs), and the decrease in muscle lactate and hydrogen ions (H⁺) after exercise in women. Before and after training, biopsies of the vastus lateralis were obtained at rest and immediately after and 60 s after 45 s of exercise at 190% of maximal O₂ uptake. Muscle samples were analyzed for ATP, phosphocreatine (PCr), lactate, and H⁺; MCT1 and MCT4 relative abundance and βm_in vitro were also determined in resting muscle only. Training provoked a large decrease in postexercise muscle pH (pH 6.81). After training, there was a significant decrease in βm_in vitro (-11%) and no significant change in relative abundance of MCT1 (96 ± 12%) or MCT4 (120 ± 21%). During the 60-s recovery after exercise, training was associated with no change in the decrease in muscle lactate, a significantly smaller decrease in muscle H⁺, and increased PCr resynthesis. These results suggest that increases in βm_in vitro and MCT relative abundance are not linked to the degree of muscle lactate and H⁺ accumulation during training. Furthermore, training that is very intense may actually lead to decreases in βm_in vitro. The smaller postexercise decrease in muscle H⁺ after training is a further novel finding and suggests that training that results in a decrease in H⁺ accumulation and an increase in PCr resynthesis can actually reduce the decrease in muscle H⁺ during the recovery from supramaximal exercise.

Affiliations:

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Le document en format XML

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<term>Hydrogen ion</term>
<term>In vitro</term>
<term>Intracellular</term>
<term>Lactates</term>
<term>Monocarboxylate transporter</term>
<term>Muscle</term>
<term>Physical exercise</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Intensité élevée</term>
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<term>Lactate</term>
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<term>Femelle</term>
<term>pH</term>
<term>In vitro</term>
<term>Intracellulaire</term>
<term>Capacité</term>
<term>Exercice physique</term>
<term>Biopsie</term>
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<front><div type="abstract" xml:lang="en">-The purpose of this study was to investigate the effects of high-intensity interval training (3 days/wk for 5 wk), provoking large changes in muscle lactate and pH, on changes in intracellular buffer capacity (βm<sub>in</sub>
 vitro), monocarboxylate transporters (MCTs), and the decrease in muscle lactate and hydrogen ions (H<sup>+</sup>
) after exercise in women. Before and after training, biopsies of the vastus lateralis were obtained at rest and immediately after and 60 s after 45 s of exercise at 190% of maximal O<sub>2</sub>
 uptake. Muscle samples were analyzed for ATP, phosphocreatine (PCr), lactate, and H<sup>+</sup>
; MCT1 and MCT4 relative abundance and βm<sub>in</sub>
 vitro were also determined in resting muscle only. Training provoked a large decrease in postexercise muscle pH (pH 6.81). After training, there was a significant decrease in βm<sub>in</sub>
 vitro (-11%) and no significant change in relative abundance of MCT1 (96 ± 12%) or MCT4 (120 ± 21%). During the 60-s recovery after exercise, training was associated with no change in the decrease in muscle lactate, a significantly smaller decrease in muscle H<sup>+</sup>
, and increased PCr resynthesis. These results suggest that increases in βm<sub>in</sub>
 vitro and MCT relative abundance are not linked to the degree of muscle lactate and H<sup>+</sup>
 accumulation during training. Furthermore, training that is very intense may actually lead to decreases in βm<sub>in</sub>
 vitro. The smaller postexercise decrease in muscle H<sup>+</sup>
 after training is a further novel finding and suggests that training that results in a decrease in H<sup>+</sup>
 accumulation and an increase in PCr resynthesis can actually reduce the decrease in muscle H<sup>+</sup>
 during the recovery from supramaximal exercise.</div>
</front>
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<name sortKey="Mercier, Jacques" sort="Mercier, Jacques" uniqKey="Mercier J" first="Jacques" last="Mercier">Jacques Mercier</name>
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Effects of high-intensity training on muscle lactate transporters and postexercise recovery of muscle lactate and hydrogen ions in women

Effects of high-intensity training on muscle lactate transporters and postexercise recovery of muscle lactate and hydrogen ions in women

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri