Hydration monitoring and rehydration guidance system for athletes based on urine color’s L*a*b* parameters

Abstract

Maintaining proper hydration is essential for athletes to sustain optimal performance and preserve their physical health. Existing studies have confirmed that urine color is one of the effective indicators for the subjective evaluation of athletes’ hydration through the urine color chart. However, the use of urine color charts to evaluate hydration is easily affected by the test environment, urine container and subjective feeling. At present, there are few hydration monitoring instruments based on quantitative analysis of urine color. In recent years, the L*a*b* color model has been widely used in the objective quantitative analysis of color. The L* value represents the luminance change from black to white, the a* value represents the chromaticity change from green to red, and the b* value represents the chromaticity change from blue to yellow. Our previous research has confirmed that the urine color b ∗ value is an effective new indicator to evaluate the hydration of athletes. The research team developed a urine hydration monitoring and rehydration guidance system based on the urine color’s L*a*b* parameters via wireless network technology and digital image technology. The hardware structure of the system is composed of a cuvette, a standard light source, a camera, an image collector, a host system, and a touch screen system. The system software is composed of functional modules, such as user information, image acquisition, image processing, and image recognition. The system operation process includes starting the system, filling in basic information, putting the sample, testing the sample, local data review, local data upload, and cloud data review. The system exhibits stable performance, a friendly operation interface, and simple and fast testing. It can objectively and accurately evaluate the hydration of athletes and provide personalized rehydration guidance. The system offers a new method for solving practical problems in sports training, and it has broad application prospects.

Association between Urine Specific Gravity as a Measure of Hydration Status and Risk of Type 2 Diabetes: The Kailuan Prospective Cohort Study

“…Participants were categorized into five hydration status subgroups based on baseline USG levels. Based on previous clinical and epidemiologic evidence, optimal hydration status was defined as USG levels less than 1.010 (reference group) [ 33 ]. Our study considered that a level greater than or equal to 1.010 indicated different degrees of hypohydration (defined as having highly concentrated urine), which were further categorized into the following groups: marginally adequate hydration (1.010 ≤ USG < 1.015, Group 2) and impending dehydration (1.015 ≤ USG < 1.020, Group 3).…”

“…Based on previous literature, we further categorized the inadequate hydration status into dehydration and severely dehydration groups. Dehydration status (1.020 ≤ USG < 1.030, Group 4) was defined based on the commonly used USG threshold values [ 33 , 34 , 35 ]. Meanwhile, considering the adverse effects of dehydration in clinical practice, we used the most stringent dehydration threshold among the commonly used USG thresholds (USG ≥1.030, Group 5) to represent severe dehydration status [ 36 ].…”