Changes of rat respiratory and locomotory muscles during aerobic exercise training in continuous and interval regimens |
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Authors: | A. A. Borzykh I. V. Kuzmin A. A. Mart’ianov A. S. Borovik A. P. Sharova O. S. Tarasova O. L. Vinogradova |
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Affiliation: | 1. Institute for Biomedical Problems, Russian Academy of Sciences, Moscow, 123007, Russia 2. Biological Faculty, Moscow State University, Moscow, 119234, Russia
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Abstract: | Male Wistar rats were treadmill-trained for 8 weeks using one of the two regimens: with the constant running speed or with alternating high-speed and low-speed intervals. Both training regimens led to an increase of rat aerobic capacities and to a higher citrate synthase activity in the medial head of gastrocnemius muscle. No differences between the effects of two training regimens were observed. However, in contrast to constant-speed training the interval one resulted in myocardium hypertrophy and also in less pronounced changes in diaphragm muscle, such as slow-direction shift of myosin phenotype and reduction of muscle fiber cross-sectional area. Neither of the training regimens had an effect on corticosterone and thyroid hormones levels in rat blood, whereas the interval training resulted in a higher level of testosterone. Anabolic influence of testosterone during interval aerobic training may be favorable for heart hemodynamic capacity and force characteristics of the diaphragm. |
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