Hydration level monitoring using embedded piezoresistive microcantilever sensors

R. L. Gunter, W. D. Delinger, T. L. Porter, R. Stewart, J. Reed

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


A new MEMS based sensor technology, embedded piezoresistive microcantilever (EPM) sensors, may be useful in the real-time monitoring of hydration levels in athletes or other individuals whose activities may result in dehydration. In these devices, organic polymers or functionalized polymeric materials respond to osmolality changes in a person's saliva by expanding or contracting volumetrically. These volumetric changes are measured by tiny piezoresistive microcantilevers embedded in the polymeric material. In this report, we have tested a prototype device utilizing UV crosslinked poly(vinyl acetate) as the active sensing material. This device was able to reliably respond to 1% changes in sodium chloride concentration in solution or alternately to 1% changes in relative humidity.

Original languageEnglish (US)
Pages (from-to)215-220
Number of pages6
JournalMedical Engineering and Physics
Issue number3
StatePublished - Apr 2005


  • Hydration
  • MEMS sensor
  • Piezoresistive microcantilever
  • Polymers

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering


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