Microwave Sensing of Human Hydration: Measurement Repeatability

Garrett, David; Thorson, Sarah; Bourqui, Jeremie; Fear, Elise C.

doi:10.1049/cp.2018.0768

Cited by 4 publications

(1 citation statement)

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“…The midpoint of the forearm was selected to provide an easily accessible tissue allowing for repeatable sensor positioning and is predominately comprised of muscle tissue, which has high water content, and bone. In previous work [35], we tested several locations and found that the forearm exhibited greater changes than the wrist, biceps, or calf, in part because the forearm allows for straightforward repositioning, which is important when collecting measurements at different time points. The antennas radiate from 1.8 to 20 GHz, however signals above 7 GHz are generally attenuated beyond the dynamic range of the measurement device due to the properties of the forearm.…”

Section: Time Of Flight Techniquementioning

confidence: 99%

Microwave Hydration Monitoring: System Assessment Using Fasting Volunteers

Besler

Fear

2021

Sensors

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Hydration is an important aspect of human health, as water is a critical nutrient used in many physiological processes. However, there is currently no clinical gold standard for non-invasively assessing hydration status. Recent work has suggested that permittivity in the microwave frequency range provides a physiologically meaningful metric for hydration monitoring. Using a simple time of flight technique for estimating permittivity, this study investigates microwave-based hydration assessment using a population of volunteers fasting during Ramadan. Volunteers are measured throughout the day while fasting during Ramadan and while not fasting after Ramadan. Comparing the estimated changes in permittivity to changes in weight and the time s fails to establish a clear relationship between permittivity and hydration. Assessing the subtle changes in hydration found in a population of sedentary, healthy adults proves difficult and more work is required to determine approaches suitable for tracking subtle changes in hydration over time with microwave-based hydration assessment techniques.

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Section: Time Of Flight Techniquementioning

confidence: 99%