Comparison of time and frequency domain measures of RSA in ambulatory recordings

Abstract

The extent to which various measures of ambulatory respiratory sinus arrhythmia (RSA) capture the same information across conditions in different subjects remains unclear. In this study the root mean square of successive differences (RMSSD), peak valley RSA (pvRSA), and high frequency power (HF power) were assessed during ambulatory recording in 84 subjects, of which 64 were retested after about 3 years. We used covariance structure modeling to test the equality of the correlations among three RSA measures over two test days and three conditions (daytime sitting or walking and nighttime sleep) and in groups with low, medium, and high mean heart rate (HR), or low, medium, and high mean respiration rate (RR). Results showed that ambulatory RMSSD, pvRSA, and HF power are highly correlated and that their correlation is stable across time, ambulatory conditions, and a wide range of resting HR and RR values. RMSSD appears to be the most cost-efficient measure of RSA.

Comparing low frequency heart rate variability and preejection period: Two sides of a different coin

“…From the ECG and the dZ, we obtained the heart period time series and respiration signal (Goedhart et al, 2007;Houtveen et al, 2005). In keeping with PEP scoring, mean LF and HF powers were computed across the entire coded period.…”

“…Procedure A detailed description of the ambulatory monitoring procedure has been provided elsewhere (Goedhart, Kupper, Willemsen, Boomsma, & de Geus, 2006;Goedhart, van der Sluis, Houtveen, Willemsen, & de Geus, 2007;Kupper et al, 2006). Briefly, subjects were fitted with the Vrije Universiteit Ambulatory Monitoring System that recorded the electrocardiogram (ECG) and the impedance cardiogram (ICG) continuously during a 24-h period (daytime and sleep) through six disposable, pregelled Ag/AgCl electrodes.…”

A Method to Reveal Workload Weak-Resilience-Signals at a Rail Control Post

“…We build upon this theory to compose XTL. We use the Integrated Workload Scale (IWS) [6] to measure subjective load and the extensively-researched heart rate variability (HRV) to identify physiological arousal due to workload change [7][8][9][10][11][12]. In the next sections, we elaborate these measures in more detail for the setting described above.…”

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children

“…However, having the subjects report to a laboratory greatly reduces ecological validity, is not always doable in large scale epidemiological studies, and can be intimidating for young children. An ambulatory device for ECG and ICG simultaneously resolves these three problems.Here, we present a study design for a minimally invasive and rapid assessment of cardiac autonomic control in children, using a validated ambulatory device [1][2][3][4][5] …”

“…Here, we present a study design for a minimally invasive and rapid assessment of cardiac autonomic control in children, using a validated ambulatory device [1][2][3][4][5] , the VU University Ambulatory Monitoring System (VU-AMS, Amsterdam, the Netherlands, www.vu-ams.nl).…”