Effects of different intensity endurance training on capillary network in rat left ventricular myocardium

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Bibliographic Details
Title translated into German:Auswirkungen unterschiedlicher Intensitaet von Ausdauertraining auf das Kapillarnetz im Myokard des linken Ventrikels bei Ratten
Author:Kano, Y.; Shimegi, S.; Masuda, K.; Sakato, H.; Katsuta, S.
Published in:Japanese journal of physical fitness and sports medicine
Published:45 (1996), 5 , S. 511-518, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
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Identification number:PU199705204842

Author's abstract

The effects of low- and high-intensity endurance training on the capillary network of rat left ventricle were studied morphometrically. Eighteen male albino rats of Wistar strain (4-wk-old) were assigned at random to a sedentary control group (Cont, n=8) and two trained groups which were both subjected to exercise on a motor-driven treadmill for 60 min a day, 5 days/wk for 9 weeks from 7 wks to 16 wks of age with different running speed; the low-intensity trained group (T-20, n=5) ran at 20 m/min and the high-intensity trained group (T-40, n=5) at 40 m/min. All morphometric parameters for the capillary and muscle fiber were determined in perfusion-fixed hearts. After the training period, the average muscle fiber cross-sectional area in the T-20 and the T-40 was not significantly different from the Cont. There were no significant differences in the capillary density and the capillary-to-fiber ratio between any groups, suggesting no significant change in capillary number. On the other hand, the number of capillary with large luminal diameter (8 to 10 micro-m) in the T-40 but not the T-20 was significantly greater than the Cont. These results indicate that the high-intensity endurance training causes enlargement of the capillary luminal area, while neither the low- nor the high-intensity endurance training stimulate the proliferation of capillaries in the left ventricular myocardium. In conclusion, a structure of the capillary network of rat left ventricle responds to the high-intensity endurance training by enlarging capillary luminal area rather than by increasing capillary number. Verf.-Referat