Comparison of heart rate variability and stroke volume variability.
In order to compare the heart rate variability (HRV) and stroke volume variability (SVV), supine electrocardiographic (ECG) and the time series data of left ventricular (LV) volume recordings were taken in 12 healthy adult male volunteers. The low frequency (LF) and high frequency (HF) peaks of HRV and SVV were evaluated quantitatively by power spectral analysis. The fractal dimension (FD) of the time series data was analyzed by the box-counting method. A LF peak around 0.1 Hz and a HF peak around 0.3 Hz were as clearly observed in the SVV spectrum as in the HRV spectrum. The LF/HF ratio in SVV was significantly lower than that in HRV, while the FD was significantly higher in SVV than in HRV. No significant correlation of HF, LF or FD was observed between HRV and SVV. Our results indicate that SVV provides different information about the activity of the autonomic nervous system than HRV.
Liu
Hongjian
H
Department of Medical Engineering and Cardiology, Institute of Development, Aging and Cancer, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan. hongjianliu63@yahoo.co.jp
Yambe
Tomoyuki
T
Sasada
Hiroshi
H
Nanka
Shunsuke
S
Tanaka
Akira
A
Nagatomi
Ryoichi
R
Nitta
Shin-Ichi
S
D000328:Adult; D001794:Blood Pressure / Q000502:physiology*; D004562:Electrocardiography / Q000379:methods; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D012815:Signal Processing, Computer-Assisted; D013057:Spectrum Analysis / Q000379:methods; D013318:Stroke Volume / Q000502:physiology*; D013997:Time Factors