[Effect of oxygen-increased respirator on SaO2 and heart rate under plateau environment].
OBJECTIVE
To study effects of oxygen-increased respirator on blood oxygen saturation (SaO2) and heart rate under altitude hypoxic environment.


METHODS
Nine subjects were carried to the plateau of 3700 m by air for the first time, and then four trials were carried out two hours later. First, SaO2 and heart rate were examined during rest without oxygen-increased respirators, and then the examination was repeated by using the respirators. Second, the examinations were repeated during loaded exercise test without respirators. After rest for one hour, test of using the respirators during motion was carried out finally.


RESULTS
During rest, after using respirators, the level of SaO2 increased significantly while heart rate decreased notably (P<0.05) than those without respirators. During loaded-bicycle exercise, after using respirators, the level of SaO2 increased significantly (P<0.05) than that without respirators, while heart rate didn't show significant difference (P>0.05). But, the recoveries of heart rate after three minutes and fives minutes were better than those without respirators (P<0.05).


CONCLUSIONS
Oxygen-increased respirator can improve the capacity of workload under altitude hypoxic environment. It can promote the acclimation to high altitude.
Luo
Er-ping
EP
Department of Biomedical Engineering, The Fourth Military Medical University, Xi'an Shannxi, China. luoerping@fmmu.edu.cn
Shen
Guang-hao
GH
Wu
Xiao-ming
XM
Lu
Li-hua
LH
Xu
Qiao-ling
QL
D000064:Acclimatization; D000293:Adolescent; D000328:Adult; D000531:Altitude; D015444:Exercise / Q000502:physiology; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D000860:Hypoxia / Q000503:physiopathology* / Q000517:prevention & control; D010101:Oxygen Consumption / Q000502:physiology*; D010102:Oxygen Inhalation Therapy; D005082:Physical Exertion