title: [Physical exertion tolerance after water immersion].
abstract: Before and after 24-hour water immersion test subjects performed a submaximal workload on a bicycle ergometer. Changes in their hematocrit, circulating plasma volume and fluid balance were compared with those during immersion. As a result, the test subjects were subdivided into two groups. For one group the workload was very hard; adaptation to immersion was accompanied by significant renal losses of fluid from the intra- and extravascular space. The bicycle ergometry test after immersion demonstrated a decrease of exercise tolerance combined with circulatory disorders. The other group showed a higher exercise tolerance; after immersion exercise tolerance remained high at the expense of the reserves that maintained optimal blood supply to the working muscles.
mesh_terms: D000328:Adult; D005080:Exercise Test; D006439:Hemodynamics; D006801:Humans; D007101:Immersion; D008297:Male; D008954:Models, Biological; D005082:Physical Exertion; D012119:Respiration; D013026:Space Flight; D014893:Weightlessness
vernacular_title: Tolerantnost' k fizicheskoĭ nagruzke posle vozdeĭstviia vodnoĭ immersii.