Effects of prolonged jump training on fibers' distribution and fat content in rabbit skeletal muscle
Résumé
Thirty male rabbits were jump-trained during 15 weeks to investigate the effects of exercise on muscle fiber distribution and morphology and intramuscular adipocytes. Our study classified Extensor Digitorum Longus (EDL) and Rectus Femoris (RF) as fast-twitch mixed muscles, and confirmed the slow-twitch oxidative and fast-twitch glycolytic types of Semimembranosus proprius (SMP) and Psoas Major (PSOAS) respectively. PSOAS muscle displayed a strong decrease in IIA fibers and an increase in IIX+IIB fibers with aging (0.001 < P < 0.05), whereas muscle fiber distributions remained stable in EDL, RF and SMP muscles. In response to jump training, the percentage of type IIA fibers in RF or PSOAS muscles was significantly higher in trained compared to control animals at each age (respectively P < 0.05 and P < 0.001), whereas the percentage of IIX+IIB fibers was lower in trained rabbits (P < 0.05). Few significant changes were found in fiber cross-sectional areas. The surface area of perivascular adipocytes was significantly lower in all trained muscles at 90 and 140 days (0.001
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Soumis le : dimanche 31 mai 2020-21:41:31
Dernière modification le : lundi 20 novembre 2023-11:44:21
Citer
C. Ducomps, Hervé Rémignon, Jean Paul Doutreloux, François Lebas, Pascale Mauriège. Effects of prolonged jump training on fibers' distribution and fat content in rabbit skeletal muscle. Journal of Exercise Physiology - Online, 2004, 7 (6), pp.27-36. ⟨hal-02679742⟩
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