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The relationship between the phase of 4-day serum corticosteroid biorhythm and resistance to acute hypobaric hypoxia was studied in male rats. Single evaluations of hypoxic resistance of Wistar rats during the same time of the day have shown that the lifespan of animals is significantly longer during the 4-day biorhythm acrophase than during the bathyphase. Daily testing for 12 days has detected a...
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