Wearable Motion Tolerant PPG Sensor for Instant Heart Rate in Daily Activity

Abstract

A wristband-type PPG heart rate sensor capable of overcoming motion artifacts in daily activity and detecting heart rate variability has been developed together with a motion artifact cancellation framework. In this work, a motion artifact model in daily life was derived and motion artifacts caused by activity of arm, finger, and wrist were cancelled significantly. Highly reliable instant heart rate detection with high noiseresistance was achieved from noise-reduced pulse signals based on peak-detection and autocorrelation methods. The wristband-type PPG heart rate sensor with our motion artifact cancellation framework was compared with ECG instant heart rate measurement in both laboratory and office environments. In a laboratory environment, mean reliability (percentage of time within 10% error relative to ECG instant heart rate) was 86.5% and the one-day pulse-accuracy achievement rate based on time use data of body motions in daily life was 88.1% or approximately 21 hours. Our device and motion artifact cancellation framework enable continuous heart rate variability monitoring in daily life and could be applied to heart rate variability analysis and emotion recognition.

Review on Smart Electro-Clothing Systems (SeCSs)

“…The system architecture generally includes eight working subsystems and two supporting subsystems. The common working subsystems included in a SeCS are as follows: (1) control subsystem, (2) sensing subsystem, (3) actuator subsystem, (4) communication subsystem, (5) location subsystem, (6) power subsystem, (7) storage subsystem, and (8) display subsystem [11]. Two supporting subsystems included in SeCSs are interconnection and software subsystems.…”

“…Except the display subsystems, in most of the cases, the rest of these subsystems are accumulated within an electronic board in as miniaturised a form as possible to finally connect to textile components [13,14]. Different sensing units that potentially form sensing subsystem of an SeCS can be motion, gesture, and position sensors, temperature and other bio-vital sensors, location sensor, interaction and environmental sensors, and sensors for detecting surrounding objects [4][5][6][7][8][9][10][11][12][13][14]. The common sensors for motion, gesture, and positions are accelerometer, magnetometer, and gyroscope.…”

“…Wrist-worn wearable devices (smart watches and fitness trackers) experienced a growth of 18% and 7% in the United Kindom during the period of 2016-2017 and 2017-2018, respectively [3]. With the advent of conductive threads, textile structures either woven or knitted from conductive yarns, and conductive print-inks including those from graphene, it is now possible to produce or integrate light-weight weight sensors onto textiles to monitor health, fitness, and performance in a non-clinical environment, in daily-life, and in sport-training conditions [4][5][6][7]. An overview of the recent developments in wearable sensors for remote health monitoring is presented by Majumder et al [8], while the smart sensors and fusion systems for sports and biomedical applications are reviewed by Mendes Jr. et al [9].…”

Wireless Photoplethysmography Sensor for Continuous Blood Pressure Biosignal Shape Acquisition

“…Ishikawa et al [13] presented a wristband-type PPG heart rate sensor [13] capable of detecting heart rate variability. Additionally, the device was equipped with a motion artefact cancellation framework to handle motion artefacts during daily activities.…”

Review on Smart Electro-Clothing Systems (SeCSs)

“…Wrist-worn wearable devices (smart watches and fitness trackers) experienced a growth of 18% and 7% in the UK during the period of 2016-2017 and 2017-2018 respectively [1]. With the advent of conductive threads, textile structures either woven or knitted from conductive yarns, conductive print-inks including those from graphene, it is now possible to produce or integrate light-weight sensors onto textiles to monitor health, fitness and performance in non-clinical environment, in daily-life and in sport-training conditions [2][3][4][5]. An overview of the recent developments in wearable sensors for remote health monitoring is presented by Majumder et al [6]; while the smart sensors and fusion systems for sports and biomedical applications are reviewed by Mendes Jr. et al [7].…”