title: Towards 24/7 continuous heart rate monitoring.
abstract: Heart rate (HR) and HR variability (HRV) carry rich information about physical activity, mental and physical load, physiological status, and health of an individual. When combined with activity monitoring and personalized physiological modelling, HR/HRV monitoring may be used for monitoring of complex behaviors and impact of behaviors and external factors on the current physiological status of an individual. Optical HR monitoring (OHR) from wrist provides a comfortable and unobtrusive method for HR/HRV monitoring and is better adhered by users than traditional ECG electrodes or chest straps. However, OHR power consumption is significantly higher than that for ECG based methods due to the measurement principle based on optical illumination of the tissue. We developed an algorithmic approach to reduce power consumption of the OHR in 24/7 HR trending. We use continuous activity monitoring and a fast converging frequency domain algorithm to derive a reliable HR estimate in 7.1s (during outdoor sports, in average) to 10.0s (during daily life). The method allows >80% reduction in power consumption in 24/7 OHR monitoring when average HR monitoring is targeted, without significant reduction in tracking accuracy.
authors.forename: Adrian
authors.initials: A
authors.lastname: Tarniceriu
authors.forename: Jakub
authors.initials: J
authors.lastname: Parak
authors.forename: Philippe
authors.initials: P
authors.lastname: Renevey
authors.forename: Marko
authors.initials: M
authors.lastname: Nurmi
authors.forename: Mattia
authors.initials: M
authors.lastname: Bertschi
authors.forename: Ricard
authors.initials: R
authors.lastname: Delgado-Gonzalo
authors.forename: Ilkka
authors.initials: I
authors.lastname: Korhonen
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000465:Algorithms; D004867:Equipment Design; D015444:Exercise; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic / Q000295:instrumentation / Q000379:methods*; D015203:Reproducibility of Results; D012890:Sleep; D013177:Sports