Human circadian circulatory rhythms during weightlessness in extraterrestrial flight or bedrest with and without exercise.
D001696:Biomechanical Phenomena; D001775:Blood Circulation; D002940:Circadian Rhythm; D005118:Extraterrestrial Environment; D006321:Heart / Q000502:physiology; D006339:Heart Rate; D006801:Humans; D007391:International Cooperation; D008297:Male; D008991:Monitoring, Physiologic; D005082:Physical Exertion; D012146:Rest; D013026:Space Flight; D013223:Statistics as Topic; D014586:USSR; D014481:United States; D014893:Weightlessness