Perrier Erica T, Johnson Evan C, McKenzie Amy L, Ellis Lindsay A, Armstrong Lawrence E
Danone Research, RD 128, 91767, Palaiseau Cedex, France.
Human Performance Laboratory, University of Connecticut, Unit 1110, Storrs, CT, 06269-1110, USA.
Eur J Nutr. 2016 Aug;55(5):1943-9. doi: 10.1007/s00394-015-1010-2. Epub 2015 Aug 19.
Urine colour (U Col) is simple to measure, differs between low-volume and high-volume drinkers, and is responsive to changes in daily total fluid intake (TFI). However, to date, no study has quantified the relationship between a change in TFI and the resultant change in U Col. This analysis aimed to determine the change in TFI needed to adjust 24-h U Col by 2 shades on an 8-colour scale, and to evaluate whether starting U Col altered the relationship between the change in TFI and change in U Col.
We performed a pooled analysis on data from 238 healthy American and European adults (50 % male; age, 28 (sd 6) years; BMI 22.9 (sd 2.6) kg/m(2)), and evaluated the change in TFI, urine volume (U Vol), and specific gravity (U SG) associated with a change in U Col of 2 shades.
The mean [95 % CI] change in TFI and U Vol associated with a decrease in U Col by 2 shades (lighter) was 1110 [914;1306] and 1011 [851;1172] mL/day, respectively, while increasing U Col by 2 shades (darker) required a reduction in TFI and U Vol of -1114 [-885;-1343] and -977 [-787;-1166] mL/day. The change in U Col was accompanied by changes in U SG (lighter urine: -.008 [-.007;-.010]; darker urine: +.008 [.006;.009]). Starting U Col did not significantly impact the TFI change required to modify U Col by 2 shades.
Our results suggest a quantifiable relationship between a change in daily TFI and the resultant change in U Col, providing individuals with a practical means for evaluating and adjusting hydration behaviours.
尿液颜色（U Col）测量简单，低饮水量者和高饮水量者的尿液颜色不同，且对每日总液体摄入量（TFI）的变化有反应。然而，迄今为止，尚无研究对TFI的变化与U Col的相应变化之间的关系进行量化。本分析旨在确定在8色标度上使24小时U Col调整2个色阶所需的TFI变化，并评估初始U Col是否会改变TFI变化与U Col变化之间的关系。
我们对238名健康的美国和欧洲成年人（50%为男性；年龄28（标准差6）岁；BMI 22.9（标准差2.6）kg/m²）的数据进行了汇总分析，并评估了与U Col变化2个色阶相关的TFI、尿量（U Vol）和比重（U SG）的变化。
与U Col降低2个色阶（变浅）相关的TFI和U Vol的平均[95%CI]变化分别为1110[914；1306]和1011[851；1172]mL/天，而使U Col增加2个色阶（变深）则需要TFI和U Vol分别减少-1114[-885；-1343]和-977[-787；-1166]mL/天。U Col的变化伴随着U SG的变化（尿液变浅：-.008[-.007；-.010]；尿液变深：+.008[.006；.009]）。初始U Col对使U Col改变2个色阶所需的TFI变化没有显著影响。
我们的结果表明，每日TFI的变化与U Col的相应变化之间存在可量化的关系，为个人提供了一种评估和调整水合行为的实用方法。
