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To study the effect of medroxyprogesterone on blood gases and cerebral regional oxygenation at high altitude, alone and in conjunction with acetazolamide, and to assess the effect on acute mountain sickness (AMS).Two placebo-controlled trials during rapid ascent to high altitude.In the first trial, 20 participants, and in the second trial, 24 participants.During rapid ascent to 4680m and on rapid...