Nom du corpus

Corpus Systématique Animale

Titre du document

Total muscle mitochondrial volume in relation to aerobic capacity of horses and steers

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Exercise
  • Heart
  • Mitochondria
  • Oxygen uptake
  • Respiration
  • Ultrastructure
Nom du fichier dans la ressource
Mammiferes_v2b_00595
Auteur(s)
  • S. R. Kayar 1
  • H. Hoppeler 1
  • S. L. Lindstedt 2
  • H. Claassen 1
  • J. H. Jones 3
  • B. Essen-Gustavsson 4
  • C. R. Taylor 3
Affiliation(s)
  • 1) Institute of Anatomy, University of Bern, Bühlstrasse 26, CH-3000, Bern, Switzerland
  • 2) Department of Zoology and Physiology, University of Wyoming, 82071, Laramie, WY, USA
  • 3) Concord Field Station, Harvard University, 02138, Concord, MA, USA
  • 4) College of Veterinary Medicine, Swedish University of Agricultural Sciences, S-750, Uppsala, Sweden
Résumé

The relationship between maximal oxygen consumption rate ( $\dot V{\text{O}}_{{\text{2max}}}$ ) and mitochondrial content of skeletal muscles was examined in horses and steers (n=3 each). Samples of the heart left ventricle, diaphragm,m. vastus medialis, m. semitendinosus, m. cutaneous thoracicus andm. masseter, as well as samples of muscles collected in a whole-body sampling procedure, were analyzed by electron microscopy. $\dot V{\text{O}}_{{\text{2max}}}$ per kilogram body mass was 2.7× greater in horses than steers. This higher $\dot V{\text{O}}_{{\text{2max}}}$ was in proportion to the higher total volume of mitochondria in horse versus steer muscle when analyzed from the whole-body samples and from the locomotor muscle samples. In non-locomotor muscles, total mitochondrial volume was greater in horses than steers, but not in proportion to their differences in $\dot V{\text{O}}_{{\text{2max}}}$ . The $\dot V{\text{O}}_{{\text{2max}}}$ of the mitochondria was estimated to be close to 4.5 ml O2·ml?1 mitochondria in both species. It is concluded that in a comparison of a highly aerobic to a less aerobic mammalian species of similar body size, a higher oxidative potential may be found in all muscles of the more aerobic species. This greater oxidative potential is achieved by a greater total volume of skeletal muscle mitochondria.

Catégories Science-Metrix
  • 1 - health sciences
  • 2 - biomedical research
  • 3 - physiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Physiology (medical)
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Clinical Biochemistry
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Physiology
Catégories WoS
  • 1 - science ; 2 - physiology
Identifiant ISTEX
4BE427C589BC2CC0C95D77589ADD69B93E865540
Revue

Pflügers Archiv

Année de publication
1989
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
8.323
Sous-corpus
  • Mammiferes
Type de publication
Journal
ark:/67375/1BB-1HKDW5PL-D
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