Ad libitum water consumption prevents exercise-associated hyponatremia and protects against dehydration in soldiers performing a 40-km route-march

It remains unclear if ad libitum water drinking, as a hydration strategy, prevents exercise-associated hyponatremia (EAH) during prolonged exercise. The aim of this study was to determine the incidence of EAH within the broader context of fluid regulation among soldiers performing a 40-km route-marc...

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Bibliographic Details
Published in:Military medical research 2019-01, Vol.6 (1), p.1-1, Article 1
Main Authors: Nolte, Heinrich W, Nolte, Kim, Hew-Butler, Tamara
Format: Article
Language:English
Subjects:
Adult
Arginine vasopressin
Arginine Vasopressin - blood
Dehydration - etiology
Dehydration - prevention & control
Drinking - physiology
Drinking water
Electrolyte balance
Electrolytes
Exercise
Exercise-associated hyponatremia
Fluid balance
Heatstroke
Humans
Hydration
Hyponatremia - etiology
Hyponatremia - prevention & control
Male
Military
Military Personnel
Osmolar Concentration
Plasma
Plasma Volume
Serum sodium concentration
Sodium
Sodium - blood
Sodium - urine
Sports medicine
Urine
Water-Electrolyte Balance
Young Adult
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Summary:It remains unclear if ad libitum water drinking, as a hydration strategy, prevents exercise-associated hyponatremia (EAH) during prolonged exercise. The aim of this study was to determine the incidence of EAH within the broader context of fluid regulation among soldiers performing a 40-km route-march ingesting water ad libitum. Twenty-eight healthy male soldiers participated in this observational trial. Pre- and post-exercise body mass, blood and urine samples were collected. Blood samples were assessed for serum sodium ([Na ]), glucose, creatinine, urea nitrogen (BUN), plasma osmolality, creatine kinase (CK), and plasma arginine vasopressin (AVP) concentrations. Plasma volume (PV) was calculated using hematocrit and hemoglobin. Urine samples were analyzed for osmolality and [Na ]. Water intake was assessed by weighing bottles before, during and after the march. The mean relative humidity was 55.7% (21.9-94.3%) and the mean dry bulb temperature was 27.1 °C (19.5 °C - 37.0 °C) during the exercise. Twenty-five soldiers (72 ± 10 kg) (Mean ± SD) completed the march in 09:11 ± 00:43 (hr:min). Participants consumed 736 ± 259 ml/h of water and lost 2.8 ± 0.9 kg (4.0% ± 1.4%, P  2% body mass losses and high urine osmolality.
ISSN:2054-9369
2095-7467
2054-9369
DOI:10.1186/s40779-019-0192-y