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Special Issue, Vol. 3, December 2008, pp.59-70





Multi-Functional Sensor System for Heart Rate, Body Position and Movement Intensity Analysis


Michael MAO, Bozena KAMINSKA, Yindar CHUO

Computational and Integrative Bio-Engineering Research Laboratory (CiBER),
School of Engineering Science, Simon Fraser University,
8888 University Drive, Burnaby, BC, Canada V5A 1S6

Tel.: (778) 782-6855

E-mail: kaminska@sfu.ca, http://ciber.fas.sfu.ca/



Received: 31 October 2008   /Accepted: 7 November 2008   /Published: 8 December 2008


Abstract: A novel multi-functional wearable sensor has been developed with multi-axis accelerometer, disposable hydro-gel electrodes, and analog filtering components. This novel sensor implementation can be used for detecting common body positions, movement intensity, and measures bio-potential signals for ECG and heart rate analysis. Based on the novel sensor principle, a prototype combines position detection, heart rate detection, and motion intensity level detection together in a handheld device that records the physiological information and wirelessly transmits the signals through Bluetooth to a mobile phone. Static body positions such as standing/sitting, lying supine, prone, and on the sides have been detected with high accuracy (97.7 %) during the subject tests. Further, an algorithm that detects body movement intensity that can potentially be applied in real-time monitoring physical activity level is proposed based on average variance values. Motion intensity results show variance values increase and exercise intensity increases for almost all of the cases. A clear relation between movement intensity level shown by an increase in frequency and/or speed of exercise increases the variance values detected in all three spatial axes.


Keywords: Multi-functional sensor, Position detection, Movement intensity, Wearable sensors, Health Monitoring


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