Department of Kinesiology, Korey Stringer Institute, University of Connecticut, 2095 Hillside Road U-1110, Storrs, CT, 06269, USA.
Sports Performance Laboratory, Department of Kinesiology and Sport Management, Texas Tech University, 3204 Main Street, Lubbock, TX, 79409, USA.
Eur J Nutr. 2023 Jun;62(4):1915-1919. doi: 10.1007/s00394-022-03037-0. Epub 2023 Feb 1.
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.
Twelve male subjects (mean ± standard deviation; age, 26 ± 8 years; body mass, 57.8 ± 5.3 kg; height, 177.5 ± 8.9 cm; VO, 57.8 ± 5.8 ml·kg·min) 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.
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).
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.
本研究旨在探讨尿液颜色的数字化与纸质化与其他尿液指标之间的关系，以评估机体的水合状态。
12 名男性受试者（平均±标准差；年龄 26±8 岁；体重 57.8±5.3kg；身高 177.5±8.9cm；VO₂ 57.8±5.8ml·kg·min）在热环境中进行了 4 项运动试验。在运动试验前后，受试者提供尿液样本。尿液样本使用便携式设备屏幕上的数字化尿液颜色图表进行测量。尿液样本还使用尿比重（USG）、尿渗透压（UOsmo）和经过验证的纸质尿液颜色图表进行评估。
数字化尿液颜色与纸质尿液颜色之间存在极强的关联（r=0.926，p<0.001）。数字化尿液颜色与 USG 和 UOsmo 的相关系数相似（USG，r=0.695，p<0.001；UOsmo，r=0.555，p<0.001），纸质尿液颜色与 USG 和 UOsmo 的相关系数相似（USG，r=0.713，p<0.001；UOsmo，r=0.570，p<0.001）。Bland-Altman 分析表明，数字化尿液颜色与纸质尿液颜色之间没有观察到比例偏差（偏差，-0.148；偏差的标准差，0.492；95%LOA，-1.11，0.817；p=0.094）。
数字化尿液颜色与纸质尿液颜色之间存在很强的关联，且没有比例偏差。此外，数字化尿液颜色与 USG 和 UOsmo 的关联程度与纸质尿液颜色相似。这些结果表明，数字化尿液颜色是评估机体水合状态的有用工具，并且该方法可以作为使用纸质尿液颜色的替代方法。
