The server is under maintenance between 08:00 to 12:00 (GMT+08:00), and please visit later.
We apologize for any inconvenience caused
Login  | Sign Up  |  Oriprobe Inc. Feed
China/Asia On Demand
Journal Articles
Laws/Policies/Regulations
Companies/Products
Bookmark and Share
Effect of Simulated Weightlessness by Head Down Bed Rest on Efficiency of Pre-oxygenation in Human
Author(s): 
Pages: 7-11
Year: Issue:  1
Journal: Space Medicine & Medical Engineering

Keyword:  simulated weightlessnesspre-oxygenationnitrogen elimination ratecumulative nitrogen volume eliminated;
Abstract: Objective To explore the influence of simulated weightlessness by head down bed rest(HDBR) on efficiency of pre-oxygenation in human,and to provide a basis for better assessment of the risk of decompression sickness in astronauts during extravehicular activity(EVA).Methods Eight healthy males served as the test subjects.The experiment included the following groups:the control group(Con,eight subjects were sitting quietly and breathing 100% O2 for 3 h),simulated weightlessness 3-day group(group 3 d,eight subjects underwent HDBR and breathing 100% O2 for 3 h on the third day of HDBR),and simulated weightlessness 7-day group(group 7 d,eight subjects under HDBR and breathing 100% O2 for 3 h on the seventh day of HDBR).The pulmonary ventilation,the breath nitrogen concentration,the nitrogen elimination rate,and the cumulative nitrogen volume eliminated were measured and calculated respectively.Results Compared with the group Con,the pulmonary ventilation in group 3 d and group 7 d showed no significant change;while the breath nitrogen concentration,the nitrogen elimination rate and the cumulative nitrogen volume eliminated increased significantly in group 3 d and in group 7 d(P<0.01).Compared with the group 3 d,the pulmonary ventilation,the breath nitrogen concentration,the nitrogen elimination rate and the cumulative nitrogen volume eliminated in group 7 d showed no significant change.Conclusion Simulated weightlessness by head down bed rest for 3 and 7 days can effectively increase nitrogen elimination efficiency during breathing 100% O2 in human.
Related Articles
No related articles found