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On Time Domain Analysis of Photoplethysmogram Signals for Monitoring Heat Stress

Elgendi, Mohamed Y., Fletcher, Rich, Norton, Ian, Brearley, Matthew B., Abbott, Derek, Lovell, Nigel H. and Schuurmans, Dale (2015). On Time Domain Analysis of Photoplethysmogram Signals for Monitoring Heat Stress. Sensors,15(10):24716-24734.

Document type: Journal Article
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IRMA ID 84278914xPUB2
Title On Time Domain Analysis of Photoplethysmogram Signals for Monitoring Heat Stress
Author Elgendi, Mohamed Y.
Fletcher, Rich
Norton, Ian
Brearley, Matthew B.
Abbott, Derek
Lovell, Nigel H.
Schuurmans, Dale
Journal Name Sensors
Publication Date 2015
Volume Number 15
Issue Number 10
ISSN 1424-8220   (check CDU catalogue open catalogue search in new window)
Start Page 24716
End Page 24734
Total Pages 19
Place of Publication Switzerland
Publisher M D P I AG
HERDC Category C1 - Journal Article (DIISR)
Abstract There are a limited number of studies on heat stress dynamics during exercise using the photoplethysmogram (PPG) and its second derivative (APG). However, we investigate the most suitable index from short PPG signal recordings for heat stress assessment. The APG waveform consists of a, b, c and d waves in systole and an e wave in diastole. Our preliminary results indicate that the use of the energy of aa area, derived from PPG signals measured from emergency responders in tropical conditions, is promising in determining the heat stress level using 20-s recordings. After examining 14 time domain features using leave-one-out cross-validation, we found that the aa energy extracted from PPG signals is the most informative feature for classifying heat-stressed subjects, with an overall accuracy of 79%. Moreover, the combination of the aa energy with the traditional heart rate variability index of heat stress (i.e., the square root of the mean of the squares of the successive aa intervals) improved the heat stress detection to an overall accuracy of 83%.
Keywords Global warming
Affordable healthcare
Thermal stress
DOI   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
Additional Notes This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Description for Link Link to CC Attribution 4.0 License

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