Genetic influence on baroreflex sensitivity in normotensive young men.

Background: The dysfunction of baroreflex plays an important role in the pathogenesis of essential hypertension. Recent studies suggest that approximately 40% of the variation in baroreflex sensitivity (BRS) may be accounted for by genetic factors. However, only a few such genetic polymorphisms have been explicitly identified.

[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.

Method: 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.

Result: 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.