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Corpus Systématique Animale

Titre du document

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

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Springer (journals)
Langue(s) du document
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Mots-clés d'auteur
  • Exercise
  • Heart
  • Mitochondria
  • Oxygen uptake
  • Respiration
  • Ultrastructure
Nom du fichier dans la ressource
  • 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
  • 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

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
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  • Mammiferes
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