Effect of Deep-Breath Biofeedback on Heart Rate Variability and Blood Pressure at High Altitude

Abstract

The objective of this study is to study the effect of deep respiration on heart rate variability and blood pressure at high altitude. Methods: Experiments were conducted in 74 male military operators who have been deployed to 3,780-mhigh altitude for 60 days. Heart rate variability and blood pressure were monitored at rest state and deep-breath biofeedback state. Result: Heart rate of deep-breath biofeedback was significantly lower than that of the rest (t = 2.01, P = 0.043). SDNN and LF were significantly higher (t = 3.70, 5.40, P \ 0.001). There was no difference in HF (P [ 0.05).Both systolic pressure and diastolic pressure of biofeedback state were significantly lower (t = 4.06, 7.63, P \ 0.001). Conclusion: Deep-breath biofeedback can increase heart rate variability and reduce heart rate and blood pressure in high altitude. It is an important assistant method used to acclimatize high altitude which can bring positive psychophysiological change to military operators.