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Twelve rats were divided equally into four groups, exercise with and without steroid administration and sedentary with and without steroid administration.
Muscle fibre size was measured as the equivalent circle diameter. Overall proportions of fast-twitch and ST muscle fibres did not vary with any of the treatments. Exercise and steroid treatments alone did not alter muscle fibre diameters. In conclusion the main finding of this study indicated that anabolic steroids in conjunction with high intensity swimming instigated ST fibre hypertrophy.
Exercise and steroid only treatments significantly elevated FOG fibre proportions while FG fibre proportions diminished. Exercise only treatment resulted in significant increases in the number of capillaries surrounding both ST and FOG fibre types.
Unable to display preview. Effects of anabolic steroids and high intensity exercise on rat skeletal muscle fibres and capillarization A morphometric study. Authors Authors and affiliations J. This is a preview of subscription content, log in to check access. Adolfsson J The time dependence of training-induced increase in skeletal muscle capillarization and the spatial capillary to fibre relationship in normal and neovascularized skeletal muscle of rats.
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