[Effects of intermittent normobaric hypoxia training on heart rate variability].
OBJECTIVE
To observe the influences of intermittent normobaric hypoxia (INH) training on heart rate variability (HRV) under hypoxia.


METHODS
Eight subjects were trained with INH for 4 weeks (24 d), subjects' HRV level, recorded during exposure to hypoxia (10% O2) before and after the training, were compared and analyzed.


RESULTS
After the INH training, average of normal to normal Intervals (R-R), standard deviation of normal to normal Intervals (SDNN), total power (TP), high frequency (HF) and low frequency (LF) increased significantly during hypoxia (P<0.05 - P<0.001); normalized low frequency (LFn), normalized high frequency (HFn) and LF/HF showed no significant change.


CONCLUSIONS
1) INH training can increase subjects' HRV under hypoxia; 2) INH training can not only be used to increase the tolerance of hypoxia, but it is also good for increasing astronaut's flying tolerance under special environment.
Xu
Xin
X
Institute of Space Medico-Engineering, Beijing, China.
Lu
Li-li
LL
Chen
Zhang-huang
ZH
Liu
Xiang-xin
XX
Li
Yong-zhi
YZ
D000222:Adaptation, Physiological; D000328:Adult; D001341:Autonomic Nervous System / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D000860:Hypoxia; D010101:Oxygen Consumption / Q000502:physiology*