Use of a simple arm-raising test with a portable laser Doppler blood flow meter to detect dehydration

H. Nogami, W. Iwasaki, T. Abe, Y. Kimura, A. Onoe, E. Higurashi, S. Takeuchi, M. Kido, M. Furue, R. Sawada

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    Abstract

    Using micro electromechanical systems (MEMS) technologies, the authors have developed the world's smallest, lightest, and least power-consuming laser Doppler blood flow meter. Unlike commercial fibre-type blood flow instruments, the new blood flow meter is invulnerable to any movements of the person wearing it and has a wireless transmitter. Utilizing the characteristics of the blood flow meter, the authors attempted to detect dehydration by having a subject simply raise an arm (arm-raising test) with the flow meter attached to a fingertip. Healthy young volunteers (20 men and two women, mean age 22.9, age range 21-27 years) were instructed to perspire in a sauna until they became dehydrated. The target dewatering ratio was 2 per cent, which was calculated from the body weight measured using a weight scale. Four markers were compared: mean blood flow (MBF) before arm-raising, MBF during arm-raising, maximum amplitude (MA) of the pulse wave during arm-raising, and inclination of reflex (IR) wave calculated from the recorded blood flow data for the non-dehydrated (before sauna) and dehydrated (3h after sauna) states in the arm-raising test. Each of the mean total markers (MBF during arm-raising, MA, and IR) was significantly lower (P < 0.05) during the dehydrated state than the non-dehydrated. These results suggest that three markers could detect dehydration and the blood flow meter devised has the potential to be used as a portable device for detecting dehydration.

    Original languageEnglish
    Pages (from-to)411-419
    Number of pages9
    JournalProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
    Volume225
    Issue number4
    DOIs
    Publication statusPublished - 2011 Apr

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    Keywords

    • Arm-raising test
    • Dehydration
    • Laser Doppler blood flow meter
    • Micro electromechanical systems

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Medicine(all)

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