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. 2023 Jun;62(4):1915-1919.
doi: 10.1007/s00394-022-03037-0. Epub 2023 Feb 1.

Comparison between digital and paper urine color to assess hydration status

Yasuki Sekiguchi  1   2 , David G Martin  3 , Ayami Yoshihara  3 , Douglas J Casa  3
Affiliations

Comparison between digital and paper urine color to assess hydration status

Yasuki Sekiguchi et al. Eur J Nutr. 2023 Jun.

Abstract

Purpose: The purpose of this study was to investigate associations between digital urine color and paper urine color with other urine indices to assess hydration status.

Methods: Twelve male subjects (mean ± standard deviation; age, 26 ± 8 years; body mass, 57.8 ± 5.3 kg; height, 177.5 ± 8.9 cm; VO2max, 57.8 ± 5.8 ml·kg-1·min-1) performed four exercise trials in the heat. Before and following exercise trials, subjects provide urine samples. Urine samples were measured using a digital urine color chart on a portable device screen. Urine samples were also assessed with urine specific gravity (USG), urine osmolality (UOsmo), and a validated paper urine color chart.

Results: There were extremely large associations found between digital urine color and paper urine color (r = 0.926, p < 0.001). Correlation coefficients showing associations with USG and UOsmo were similar between digital urine color (USG, r = 0.695, p < 0.001; UOsmo, r = 0.555, p < 0.001) and paper urine color (USG, r = 0.713, p < 0.001; UOsmo, r = 0.570, p < 0.001). Bland-Altman analysis indicated that no proportional bias was observed between digital and paper urine colors (bias, - 0.148; SD of bias, 0.492; 95% LOA, - 1.11, 0.817; p = 0.094).

Conclusions: Strong associations were found between digital and paper urine colors with no proportional bias. Furthermore, the degree of associations with USG and UOsmo was similar between digital and paper urine color. These results indicate that digital urine color is a useful tool to assess hydration status and this method could be used as an alternative method to using paper urine color.

Keywords: Assessment; Dehydration; Hydration; Urine.

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References

    1. Sawka MN, Burke LM, Eichner ER et al (2007) American college of sports medicine position stand. Exercise and fluid replacement. Med Sci Sports Exerc 39:377–390. https://doi.org/10.1249/mss.0b013e31802ca597 - DOI - PubMed
    1. Judelson DA, Maresh CM, Anderson JM et al (2007) Hydration and muscular performance: does fluid balance affect strength, power and high-intensity endurance? Sports Med 37:907–921 - DOI - PubMed
    1. Baker LB, Dougherty KA, Chow M, Kenney WL (2007) Progressive dehydration causes a progressive decline in basketball skill performance. Med Sci Sports Exerc 39:1114–1123. https://doi.org/10.1249/mss.0b013e3180574b02 - DOI - PubMed
    1. Armstrong LE, Maresh CM, Castellani JW et al (1994) Urinary indices of hydration status. Int J Sport Nutr 4:265–279 - DOI - PubMed
    1. Armstrong LE, Soto JA, Hacker FT et al (1998) Urinary indices during dehydration, exercise, and rehydration. Int J Sport Nutr 8:345–355 - DOI - PubMed

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