Abstract
1. 1.|Light and electron microscope morphometry has been used to study the effect on heart morphology of a sedentary life style in normothermic (24°C) and warm acclimated (34°C) rats in comparison with exercised normothermic and warm acclimated rats. 2. 2.|The sedentary acclimated rats had multiple foci of myocardial necrosis while the exercised rats did not. The capillary to myofibre ratio and the number of mast cells were higher in the acclimated exercised hearts than in hearts from all the other groups. The intercapillary distance and the mitochondrial volume fractions were not affected by any treatment regime. 3. 3.|It is concluded that although some neoangiogenesis occurs during exercise + heat, the neoangiogenesis does not explain the absence of myocardial pathology produced by heat alone.
Original language | English |
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Pages (from-to) | 159-163 |
Number of pages | 5 |
Journal | Journal of Thermal Biology |
Volume | 18 |
Issue number | 3 |
DOIs | |
State | Published - Jun 1993 |
Keywords
- acclimation
- angiogenesis
- cardiac morphometry
- cardioprotection
- Exercise
- rat