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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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
Issue number4
Publication statusPublished - Apr 2011

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering


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