, Volume 113, Issue 8, pp 2169-2170
Date: 28 May 2013

Authors’ response: comparison between blood and urinary fluid balance indices during dehydrating exercise and the subsequent hypohydration when fluid is not restored

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We appreciate the interest shown by Dr. Cheuvront and Kenefick in our recent paper (Hamouti et al. 2013). We coincide with the latter portion of their letter that it is in the best interest of the reader to clarify our message. The last sentence of our abstract reads “Both indices (blood and urine) maintain the ability to detect a 3 % overnight hypohydration”. We believe that there is no discussion in this point, and the disagreement arrives when we continue to state that “although serum osmolality (Sosm) approaches euhydration values, urine specific gravity (Usg) remains a superior index to detect dehydration”. Dr. Cheuvront and Kenefick show their disagreement with this latter section and argue that our observation is flawed by an artifact in the time of sampling.

The truth of the matter is that our subjects remained dehydrated overnight at the same level (3 %) that they end up the exercise. You would expect from a hydration index to also remain at the same elevated level that when ex ...

Communicated by Klaas Westerterp/Håkan Westerblad.