Comment on: “Drinking Strategies: Planned Drinking versus Drinking to Thirst”
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We have read with interest the topical review article  entitled “Drinking strategies: planned drinking versus drinking to thirst”, where Dr. Kenefick summarizes the evidence on pre-established drinking plans versus ad libitum drinking during exercise with a main focus on performance. Assessing an individual’s hydration pattern during exercise has received special attention in the sports science field based on the notion that dehydration dysregulates fluid homeostasis, thereby leading to physiological stress and impaired performance .
Kenefick  establishes a 2% body weight (BW) loss during exercise as a threshold for impairment of thermoregulatory and cardiovascular function, with subsequent decreases in exercise performance. His final advice is to avoid drinking to thirst in order to prevent BW losses > 2% during activities of high intensity or long duration (> 1–2 h), or when exercising in warm/hot environments. However, some aspects of the relationship between...
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Pedro L. Valenzuela is supported by a predoctoral contract granted by the University of Alcalá (FPI2016), and Javier S. Morales is supported by a predoctoral contract granted by the Ministry of Education, Culture and Sport (FPU14/03435). No specific sources of funding were used to assist in the preparation of this letter.
Conflict of interest
Pedro L. Valenzuela, Javier S. Morales, Pedro de la Villa and Alejandro Lucía declare they have no conflicts of interest relevant to the content of this letter.