Summary
Male rats were subdivided according to motor activity in subgroups running daily on a motor-driven tread-mill and hanging on vertical ladders during 4–6 hrs per day (A), further in subgroups limited arteficially in motor activity in small cages (L) from the 18th to 65th (I) and from 18th to 285th day of life (II), and compared with controls (C). Both in 65th and 285th days of life the animals with increased motor activity had significantly increased caloric input, lowest weight and fat proportions, relatively heaviest liver, adrenals, tibialis and soleus muscles per 100 g body weight. Lowest caloric input in limited animals was found. Highest weights and fat proportions in control animals were found, with average caloric input. There existed no delayed consequences of changed motor regime from 18th to 65th days of life which were studied after period of latency at the age of 285 days (III). — The density of capillaries and muscle fibers per mm2 showed only significantly greater density of capillaries in soleus muscle in animals with increased motor activity at the age of 65 days (I), but not at the age of 285 days (II). There were no differences in capillary and muscle fiber densities as well as further indicators (capillary: fiber ratio, diffusion distance D/2) in the heart muscle in any of groups. Also the migration activity of cells from liver and spleen fragments in vitro studied in 285-days old animals (II) did not show differences as regards motor activity; neither there existed any prolongation of migration activity of cells from the heart and skeletal muscle fragments in vitro at this age.
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Pařízková, J., Wachtlová, M. & Soukupová, M. The impact of different motor activity on body composition, density of capillaries and fibers in the heart and soleus muscles, and cell's migration in vitro in male rats. Int. Z. Angew. Physiol. Einschl. Arbeitsphysiol. 30, 207–216 (1972). https://doi.org/10.1007/BF00699121
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DOI: https://doi.org/10.1007/BF00699121