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Exploring the Potential of a Wrist-Worn Optical Sensor for Measuring Daily Life Activities

Authors:
Tomoko Funayama
Yasutaka Uchida
Eiichi Ohkubo
Yoshiaki Kogure

Keywords: Optical Sensor; Activities of Daily Living; Spectrum Analysis; Self-Therapy.

Abstract:
In recent years, wearable sensor devices that can be worn in daily life have rapidly gained popularity. The ability to monitor daily life, through a prolonged assessment, enables the detection of subtle changes in health status. Evaluating individuals in their usual daily settings provides an assessment that cannot be obtained within a hospital environment. However, there are not many research data on how activities specifically and objectively affect health. Therefore, in this study, we utilized an optical sensor device worn on the wrist to measure daily activities during individuals' daily routines. We studied heart rate and Fourier analysis and examined the relationship between condition and activity. As a result, the following aspects were deemed necessary to consider during measurement: 1) Analyze the data, taking into account not only the unstable period until the device stabilizes but also the time when subjects are operating the device. Consider the excluded data time and set the measurement time accordingly. 2) In addition to frequencies of 1Hz, 0.3Hz, 0.1Hz, also include analysis of the low-frequency ranges, such as 0.01Hz. 3) In case of significant variations in optical sensor data caused by arm movements, during abrupt and rapid changes (such as when the measured values from the accelerometer sensor exceed a certain threshold), data is excluded from the analysis of the light sensor. 4) Divide and analyze the data based on units, such as 10 seconds, 1 minute, 10 minutes, and investigate the changes in a time series. 5) Compare changes during activities and rest periods, and within the subject's activities. Examine the variations in the time required for cool-down and recovery. 6)Consider external factors, such as the influence of natural light, fluorescent lights, and vibrations from cars or trains. This study suggests that tailored measurement and analysis for various activities and environments are crucial in order to utilize optical sensor for health promotion and rehabilitation in daily life activities.

Pages: 18 to 24

Copyright: Copyright (c) IARIA, 2023

Publication date: September 25, 2023

Published in: conference

ISSN: 2308-4553

ISBN: 978-1-68558-112-1

Location: Porto, Portugal

Dates: from September 25, 2023 to September 29, 2023