... for 1 week (1 wk-t) or 6 weeks (6 wks-t). By means of morphometry, the capillarity as well as the compartmental and sub-compartmental structure of the capillaries were quantitatively described at the light microscopy level and at the electron microscopy level, respectively, in the plantaris (PLNT...

... in lateral red muscle( b =0.5). Although oxidative enzymes showed negative allometry in red muscle ( b =–0.01 to –0.02), mass-specific myoglobin content scaled positively ( b =0.7). Capillary to fibre ratio of red muscle was higher in larger (1.42±0.15) than smaller (1.20±0.15)fish, suggesting progressive...

..., substrates have an additional option. They can be stored intracellularly as lipid droplets or glycogen, and thus their supply to mitochondria can occur in two steps separated in time: from capillaries to stores during rest, and from stores to mitochondria during work. The integrated pathways have a network...

...Ruth Vock; Ewald R. Weibel; Hans Hoppeler; George Ordway; Jean-Michel Weber; C. Richard Taylor ABSTRACT This paper quantifies the structural capacity of the transport steps for oxygen, glucose and fatty acids from the blood in capillaries to the cytosol of muscle cells and compares it with maximal...

... consumption was increased at higher exercise intensities. The supply of both glucose and fatty acids from the capillaries reached maximal rates at low exercise intensities; this limitation is related to the design of the sarcolemma as calculations suggest that the endothelium introduces only a small...

...S. R. Kayar; H. Hoppeler; B. Essen-Gustavsson; K. Schwerzmann ABSTRACT A morphometric analysis was performed on horse muscle tissue to quantify mitochondrial distribution relative to capillaries. Samples of M. vastus medialis, M. semitendinosus, M. masseter and M. cutaneus thoracicus were preserved...

... Measurements were made of mitochondrial volume densities [Vv(mt,f)] and capillary supply to fast and slow myotomal muscles. The fraction of fibre volume occupied by mitochondria was 15% for slow and 2·5% for fast muscles. Values for [Vv(mt,f)] obtained for fish slow fibres are much higher than for homologous...