title: Early cardiovascular adaptation to simulated zero gravity.
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D001810:Blood Volume; D002302:Cardiac Output; D006321:Heart / Q000502:physiology*; D006339:Heart Rate; D006400:Hematocrit; D006801:Humans; D008297:Male; D011187:Posture; D013026:Space Flight; D013318:Stroke Volume; D014893:Weightlessness