Feasibility Study of Hydration Monitoring Using Microwaves–Part 2: Measurements of Athletes

Garrett, David; Fletcher, Jared R.; Hogan, David B.; Fung, Tak; Fear, Elise C.

doi:10.1109/jerm.2019.2911909

Cited by 14 publications

(13 citation statements)

References 34 publications

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“…The study design will be presented as follows: the previously designed measurement system is described and TOF technique is reviewed as a method of tracking changes in permittivity. This method has been previously described in detail [14,33], so only a summary is given. This is followed by details on volunteer recruitment and finally the measurement schedule is discussed.…”

Section: Methodsmentioning

confidence: 99%

“…Fasting volunteers are expected to experience changes in hydration over a day similar to the changes that athletes in previous studies [14] experienced over an hour. Tracking these more subtle changes in hydration provides insight into the potential and limitations of microwave-based hydration assessment.…”

Section: Research Objectivementioning

confidence: 98%

“…A measurement setup, as seen in Figure 1, consisting of two ultrawideband (UWB) antennas, a forearm holder, and vector network analyzer (VNA) was previously developed [14]. The UWB antennas, dubbed Nahannis, are dielectric loaded with a high permittivity ceramic to enable operation in direct contact with skin [34].…”

Section: Time Of Flight Techniquementioning

confidence: 99%

“…It is hypothesized that changes in total body water are reflected in tissue water content due to osmotic pressure [12]. By estimating the tissue water content using sensors in contact with the body, microwave-based hydration assessment has the potential to provide a sensitive, physiologically meaningful, and noninvasive method of monitoring hydration in patients [13,14]. As reviewed in [2], several microwave frequency approaches to hydration monitoring have been previously explored.…”

Section: Introductionmentioning

confidence: 99%

“…Our team has previously examined measurements of microwave signals passing through the forearm for hydration monitoring, focusing on detecting differences over time as an indicator of hydration status. This technique has previously been explored in models derived from the water content of tissues [12] and a group of wrestlers undergoing acute water loss during practice [14].…”

Section: Introductionmentioning

confidence: 99%

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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: Methodsmentioning

confidence: 99%

Section: Research Objectivementioning

confidence: 98%