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Sensors 2017, 17(3), 556; doi:10.3390/s17030556

An Experimental Study of the Effects of External Physiological Parameters on the Photoplethysmography Signals in the Context of Local Blood Pressure (Hydrostatic Pressure Changes)

Optical Fibre Sensors Research Centre, Department of Electronic & Computer Engineering, University of Limerick, Limerick V94 T9PX, Ireland
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Author to whom correspondence should be addressed.
Academic Editor: Ali Khademhosseini
Received: 23 November 2016 / Revised: 28 February 2017 / Accepted: 8 March 2017 / Published: 10 March 2017
(This article belongs to the Section Biosensors)

Abstract

A comprehensive study of the effect of a wide range of controlled human subject motion on Photoplethysmographic signals is reported. The investigation includes testing of two separate groups of 5 and 18 subjects who were asked to undertake set exercises whilst simultaneously monitoring a wide range of physiological parameters including Breathing Rate, Heart Rate and Localised Blood Pressure using commercial clinical sensing systems. The unique finger mounted PPG probe equipped with miniature three axis accelerometers for undertaking this investigation was a purpose built in-house version which is designed to facilitate reproducible application to a wide range of human subjects and the study of motion. The subjects were required to undertake several motion based exercises including standing, sitting and lying down and transitions between these states. They were also required to undertake set arm movements including arm-swinging and wrist rotation. A comprehensive set of experimental results corresponding to all motion inducing exercises have been recorded and analysed including the baseline (BL) value (DC component) and the amplitude of the oscillation of the PPG. All physiological parameters were also recorded as a simultaneous time varying waveform. The effects of the motion and specifically the localised Blood Pressure (BP) have been studied and related to possible influences of the Autonomic Nervous System (ANS) and hemodynamic pressure variations. It is envisaged that a comprehensive study of the effect of motion and the localised pressure fluctuations will provide valuable information for the future minimisation of motion artefact effect on the PPG signals of this probe and allow the accurate assessment of total haemoglobin concentration which is the primary function of the probe. View Full-Text
Keywords: accelerometer; autonomic nervous system; local blood pressure; motion artefact; photoplethysmography (PPG); wearable biosensor accelerometer; autonomic nervous system; local blood pressure; motion artefact; photoplethysmography (PPG); wearable biosensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yuan, H.; Poeggel, S.; Newe, T.; Lewis, E.; Viphavakit, C.; Leen, G. An Experimental Study of the Effects of External Physiological Parameters on the Photoplethysmography Signals in the Context of Local Blood Pressure (Hydrostatic Pressure Changes). Sensors 2017, 17, 556.

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