Estimating heart rate and RSA from the mattress-recorded kinetocardiogram.
This article describes a method for extracting heart rate (HR) and respiratory sinus arrhythmia (RSA) from the kinetocardiogram (KCG) recorded from accelerometers embedded in a mattress topper. Validation has been performed via comparison with simultaneously recorded ECG. All-night estimates of HR and RSA magnitude derived from both methods were highly correlated. KCG-derived estimates of HR were slightly lower, and those of RSA magnitude higher, than those derived from ECG. These biases are consistent with the need to constrain KCG estimation to periods free of body movement. Mattress actigraphy represents a zero-burden method of obtaining intensive longitudinal indices of cardiac status.
Woodward
Steven H
SH
National Center for PTSD, Clinical Laboratory and Education Division, VA Palo Alto HCS, Menlo Park Division, Menlo Park 94025, and Department of Psychiatry and Behavioral Sciences, Stanford University, California, USA. steve.woodward@va.gov
Arsenault
Ned J
NJ
Voelker
Karin
K
Nguyen
Tram
T
Lynch
Janel
J
Leskin
Greg
G
Sheikh
Javaid
J
D000328:Adult; D000465:Algorithms; D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010275:Parasympathetic Nervous System / Q000503:physiopathology; D017286:Polysomnography; D015203:Reproducibility of Results; D012894:Sleep Stages / Q000502:physiology