Abstract
We studied the infarct-limiting effect of adaptation to chronic normobaric hypoxia in rats with induced metabolic syndrome and the relationship between disturbances of adaptive cardioprotection and disorders of carbohydrate and lipid metabolism. Adaptation to chronic normobaric hypoxia was carried out for 21 days at 12% O2 and 0.3% CO2. The metabolic syndrome was modeled with a high-carbohydrate high-fat diet for 84 days with replacement of drinking water with a 20% fructose solution. The infarct size in rats exposed to chronic normobaric hypoxia was 38% smaller than in control animals. In rats with induced metabolic syndrome, hypertension, obesity, decreased glucose tolerance, increased serum triglyceride, and no infarction-limiting effect of chronic normobaric hypoxia were observed. Infarct size showed a direct correlation with impaired glucose tolerance and serum triglyceride levels. The study allows us to conclude that the lack of cardioprotection in chronic normobaric hypoxia in rats with induced metabolic syndrome is associated with impaired carbohydrate and lipid metabolism.
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