Effects of Regular Respiration and Title Angle Altering on the Cardiovascular System

In this study, we found that different respiratory rate and title angle affect the cardiovascular modulated system. Subjects were examine the ECG with 4- and 10-second breathing, during experiment. We Analyze the Heart Rate Variability (HRV) among the different breathing rate and the title angle. We found that in 4 seconds breathing, supine and 70 degrees title up showed the HRV change significantly. In Time domain: the R-R standard deviation, HR standard deviation, R-R average and HR have the significant differences. In Frequency domain: LF (%), HF (%), LF nu, LH / HF, HF nu are significant differences. These results indicated that, different posture and breathing rate could affect the cardiovascular modulated system.