Effects of Noise Stress on Blood Pressure and Heart Rate Variability in Objects

The objects were respectively stimulated by 80 dB and 100 dB noise.Their blood pressure(BP),electrocardiogram and heart rate variability(HRV) were tested on1、5、10、15 and 20 days.The experimental results showed that noise stress increased both the systolic blood pressure(SBP) and heart rate(HR) of the objects,but the diastolic blood pressure(DBP) was not affected significantly.Frequency analysis of heart rate variability(HRV) showed that the high frequency component(HF) and low frequency component(LF) was increased,while the R-R interval(RRI) was decreased.The effects of 100 dB were more apparent than 80 dB.These results denoted that noise stress had obvious influence on action of human cardiovascular system.