Changes in the skin characteristics associated with dehydration and rehydration

Eda, Nobuhiko; Nakamura, Nobuhiro; Inai, Yuto; Sun, Ziyue; Sone, Ryoko; Watanabe, Koichi; Akama, Takao

doi:10.1080/17461391.2022.2044914

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…These data leave the question of tracking dehydration status unresolved. However, more recent information derived from 10 healthy exercising subjects indicates a tracking of hydration status via TDC values [125]. Other studies, in which the relationship between total body water percentage and measured TDC values was investigated, were also consistent with TDC being a possible indicator of body fluid status [62].…”

Section: Dehydration Statusmentioning

confidence: 84%

Medical Applications of Skin Tissue Dielectric Constant Measurements

Mayrovitz

2023

Cureus

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Tissue dielectric constant (TDC) values assess certain skin properties that are dependent on multiple factors but mainly on the relative amount of water content within a locally measured tissue volume. Because of the non-invasive nature of these measurements and their ease of use, the method has been widely used in various medically related applications. The goal of this paper was to review and describe the uses and findings of such TDC measurements, considering and including the wide array of medical applications. The review is in part based on information derived from an analysis of published material obtained via literature searches of four major electronic databases and, in part, based on the author's experience with the TDC measurement methods and their various applications and his professional experiences. The databases searched were PubMed, Web of Science, EMBASE, and CINAHL Complete. Based on the initial search criteria, a total of 1257 titles were identified. After removing duplicates and filtering according to relevancy, 160 remained for detailed further review. In some cases, the bibliography of these retrieved articles provided additional sources. The findings demonstrate multiple research and medical uses and applications of TDC measurements, focusing on detecting and quantifying localized edema and lymphedema in multiple target sites. These include the upper and lower extremities, breasts, and trunk as regions involved in medical conditions causing lymphedema. In addition, the findings suggest that TDC evaluations are a convenient, non-invasive method to study and evaluate other conditions impacting skin, including diabetes mellitus and skin wounds or ulcers. Its ability to detect aspects of tissue changes simply and rapidly at almost any anatomical location makes it a useful tool for investigating multiple dermatological conditions and their treatment as future applications of this method.

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Section: Dehydration Statusmentioning

confidence: 84%

Medical Applications of Skin Tissue Dielectric Constant Measurements

Mayrovitz

2023

Cureus

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Near-infrared spectroscopy–enabled electromechanical systems for fast mapping of biomechanics and subcutaneous diagnosis

Wang,

Henderson,

Hafiz

et al. 2024

Sci. Adv.

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Fast and accurate assessment of skin mechanics holds great promise in diagnosing various epidermal diseases, yet substantial challenges remain in developing simple and wearable strategies for continuous monitoring. Here, we present a design concept, named active near-infrared spectroscopy patch (ANIRP) for continuously mapping skin mechanics. ANIRP addresses these challenges by integrating near-infrared (NIR) sensing with mechanical actuators, enabling rapid measurement (<1 s) of Young’s modulus, high spatial sensing density (~1 cm 2 ), and high spatial sensitivity (<1 mm). Unlike conventional electromechanical sensors, NIR sensors precisely capture vibrational frequencies propagated from the actuators without needing ultraclose contact, enhancing wearing comfort. Demonstrated examples include ANIRPs for comprehensively moduli mapping of artificial tissues with varied mechanical properties emulating tumorous fibrosis. On-body validation of the ANIRP across skin locations confirms its practical utility for clinical monitoring of epidermal mechanics, promising considerable advancements in real-time, noninvasive skin diagnostics and continuous health monitoring.

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A New Method for Detecting Dehydration of the Human Body Using Non-Contact Millimeter Wave Radiometry

Owda

2024

Sensors

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Dehydration is a common problem in the aging population. Medical professionals can detect dehydration using either blood or urine tests. This requires experimental tests in the lab as well as urine and blood samples to be obtained from the patients. This paper proposed 100 GHz millimeter wave radiometry for early detection of dehydration. Reflectance measurements were performed on healthy and dehydrated patients of both genders (120 males and 80 females) in the aging population. Based on the cause of dehydration, the patient groups were divided into three categories: (1) patients dehydrated due to less thirst sensation, (2) patients dehydrated due to illnesses (vomiting and diarrhea), and (3) patients dehydrated due to diabetes. Reflectance measurements were performed on eight locations: (1) the palm, (2) the back of the hand, (3) the fingers, (4) the inner wrist, (5) the outer wrist, (6) the volar side of the arm, (7) the dorsal surface of the arm, and (8) the elbow. Skin dehydrated due to vomiting and diarrhea was found to have lower reflectance at all the measurement locations compared with healthy and other types of dehydrated skin. The elbow region showed the highest difference in reflectance between healthy and dehydrated skin. This indicates that radiometric sensitivity is sufficient to detect dehydration in a few seconds. This will reduce the patient’s waiting time and the healthcare professional’s intervention time as well as allow early treatment of dehydration, thus avoiding admission to hospitals.

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Changes in the skin characteristics associated with dehydration and rehydration

Cited by 3 publications

References 29 publications

Medical Applications of Skin Tissue Dielectric Constant Measurements

Medical Applications of Skin Tissue Dielectric Constant Measurements

Near-infrared spectroscopy–enabled electromechanical systems for fast mapping of biomechanics and subcutaneous diagnosis

A New Method for Detecting Dehydration of the Human Body Using Non-Contact Millimeter Wave Radiometry

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