title: [Effect of 7 d head down bed rest on cardiopulmonary circulation in human].
abstract: Changes of cardiopulmonary circulation in 6 healthy young men during 7 d head down bed rest (-6 degrees HDT) were observed with the XXH-2000 lesser circulation and cardiac function instrument. Decrease of Q-j and Q-j/j-z, increase of hz, hc, and hc/hz were found during the initial 24 h. After 24 h, j-z decreased and Q-j/j-z increased. The results showed that increased pulmonary arterial pressure, increased preload of left and right heart, increased right myocardial contractility and congestion of the lungs appeared during 24 h bed rest, after which right myocardial contractility decreased. It suggests that the lesser circulation and cardiac function testing is a sensitive method for evaluating the cardiopulmonary circulation function during HDT.
authors.affiliation: Institute of Space Medico-Engineering, Beijing, China.
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: Q
authors.initials: Q
authors.lastname: Xiang
authors.forename: X
authors.initials: X
authors.lastname: Shen
authors.forename: J
authors.initials: J
authors.lastname: Meng
authors.forename: Q
authors.initials: Q
authors.lastname: Dong
mesh_terms: D000328:Adult; D000337:Aerospace Medicine; D001510:Bed Rest; D001794:Blood Pressure / Q000502:physiology; D002320:Cardiovascular Physiological Phenomena; D003326:Coronary Circulation / Q000502:physiology*; D018475:Head-Down Tilt; D006801:Humans; D008297:Male; D009200:Myocardial Contraction / Q000502:physiology; D011652:Pulmonary Circulation / Q000502:physiology*; D018474:Weightlessness Simulation