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Detection of Site-Specific Blood Flow Variation in Humans during Running by a Wearable Laser Doppler Flowmeter

Wearable wireless physiological sensors are helpful for monitoring and maintaining human health. Blood flow contains abundant physiological information but it is hard to measure blood flow during exercise using conventional blood flowmeters because of their size, weight, and use of optic fibers. To...

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Autores principales: Iwasaki, Wataru, Nogami, Hirofumi, Takeuchi, Satoshi, Furue, Masutaka, Higurashi, Eiji, Sawada, Renshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4634506/
https://www.ncbi.nlm.nih.gov/pubmed/26445047
http://dx.doi.org/10.3390/s151025507
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author Iwasaki, Wataru
Nogami, Hirofumi
Takeuchi, Satoshi
Furue, Masutaka
Higurashi, Eiji
Sawada, Renshi
author_facet Iwasaki, Wataru
Nogami, Hirofumi
Takeuchi, Satoshi
Furue, Masutaka
Higurashi, Eiji
Sawada, Renshi
author_sort Iwasaki, Wataru
collection PubMed
description Wearable wireless physiological sensors are helpful for monitoring and maintaining human health. Blood flow contains abundant physiological information but it is hard to measure blood flow during exercise using conventional blood flowmeters because of their size, weight, and use of optic fibers. To resolve these disadvantages, we previously developed a micro integrated laser Doppler blood flowmeter using microelectromechanical systems technology. This micro blood flowmeter is wearable and capable of stable measurement signals even during movement. Therefore, we attempted to measure skin blood flow at the forehead, fingertip, and earlobe of seven young men while running as a pilot experiment to extend the utility of the micro blood flowmeter. We measured blood flow in each subject at velocities of 6, 8, and 10 km/h. We succeeded in obtaining stable measurements of blood flow, with few motion artifacts, using the micro blood flowmeter, and the pulse wave signal and motion artifacts were clearly separated by conducting frequency analysis. Furthermore, the results showed that the extent of the changes in blood flow depended on the intensity of exercise as well as previous work with an ergometer. Thus, we demonstrated the capability of this wearable blood flow sensor for measurement during exercise.
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spelling pubmed-46345062015-11-23 Detection of Site-Specific Blood Flow Variation in Humans during Running by a Wearable Laser Doppler Flowmeter Iwasaki, Wataru Nogami, Hirofumi Takeuchi, Satoshi Furue, Masutaka Higurashi, Eiji Sawada, Renshi Sensors (Basel) Article Wearable wireless physiological sensors are helpful for monitoring and maintaining human health. Blood flow contains abundant physiological information but it is hard to measure blood flow during exercise using conventional blood flowmeters because of their size, weight, and use of optic fibers. To resolve these disadvantages, we previously developed a micro integrated laser Doppler blood flowmeter using microelectromechanical systems technology. This micro blood flowmeter is wearable and capable of stable measurement signals even during movement. Therefore, we attempted to measure skin blood flow at the forehead, fingertip, and earlobe of seven young men while running as a pilot experiment to extend the utility of the micro blood flowmeter. We measured blood flow in each subject at velocities of 6, 8, and 10 km/h. We succeeded in obtaining stable measurements of blood flow, with few motion artifacts, using the micro blood flowmeter, and the pulse wave signal and motion artifacts were clearly separated by conducting frequency analysis. Furthermore, the results showed that the extent of the changes in blood flow depended on the intensity of exercise as well as previous work with an ergometer. Thus, we demonstrated the capability of this wearable blood flow sensor for measurement during exercise. MDPI 2015-10-05 /pmc/articles/PMC4634506/ /pubmed/26445047 http://dx.doi.org/10.3390/s151025507 Text en © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Iwasaki, Wataru
Nogami, Hirofumi
Takeuchi, Satoshi
Furue, Masutaka
Higurashi, Eiji
Sawada, Renshi
Detection of Site-Specific Blood Flow Variation in Humans during Running by a Wearable Laser Doppler Flowmeter
title Detection of Site-Specific Blood Flow Variation in Humans during Running by a Wearable Laser Doppler Flowmeter
title_full Detection of Site-Specific Blood Flow Variation in Humans during Running by a Wearable Laser Doppler Flowmeter
title_fullStr Detection of Site-Specific Blood Flow Variation in Humans during Running by a Wearable Laser Doppler Flowmeter
title_full_unstemmed Detection of Site-Specific Blood Flow Variation in Humans during Running by a Wearable Laser Doppler Flowmeter
title_short Detection of Site-Specific Blood Flow Variation in Humans during Running by a Wearable Laser Doppler Flowmeter
title_sort detection of site-specific blood flow variation in humans during running by a wearable laser doppler flowmeter
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4634506/
https://www.ncbi.nlm.nih.gov/pubmed/26445047
http://dx.doi.org/10.3390/s151025507
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