Cardiology Research, ISSN 1923-2829 print, 1923-2837 online, Open Access
Article copyright, the authors; Journal compilation copyright, Cardiol Res and Elmer Press Inc
Journal website https://www.cardiologyres.org

Original Article

Volume 2, Number 3, June 2011, pages 112-118

Circadian Patterns of Heart Rate Turbulence, Heart Rate Variability and Their Relationship

Figures

Figure 1a. Figure 1b.
Figure 1. Hour-to-hour circadian variation (mean ± SD) of heart rate turbulence (HRT) and heart rate variability (HRV) parameters. (A) Turbulence onset (TO), (B) turbulence slope (TS), (C) low frequency (LF), (D) high frequency (HF), (E) low frequency/high frequency (LF/HF), (F) very low frequency (VLF), (G) square root of the mean of the sum of squares of differences between adjacent NN intervals (rMSSD), (H) percentage of absolute differences between successive normal RR intervals that exceed 50 msec (pNN50), (I) standard deviation of normal RR interval (SDNN), and (J) mean of the SD of all RR intervals for all five minute segments (SDNNI).
Figure 2.
Figure 2. Time courses of the correlation coefficient r of the relationship between HRV frequency domains ln(LF), ln(HF), and ln(LF/HF) and (A) TO and (B) TS values.
Figure 3.
Figure 3. Time courses of the correlation coefficient r of the relationship between HRV time domain and HRT values. (Upper panel) SDNN, SDNNI vs. (A) TO and (B) TS values; and (Lower panel) pNN50, rMSSD vs. (C) TO and (D) TS values.