Personalized Hydration Strategy to Improve Fluid Balance and Intermittent Exercise Performance in the Heat.
Nutrients
; 16(9)2024 Apr 29.
Article
em En
| MEDLINE
| ID: mdl-38732589
ABSTRACT
Sweat rate and electrolyte losses have a large inter-individual variability. A personalized approach to hydration can overcome this issue to meet an individual's needs. This study aimed to investigate the effects of a personalized hydration strategy (PHS) on fluid balance and intermittent exercise performance. Twelve participants conducted 11 laboratory visits including a VO2max test and two 5-day trial arms under normothermic (NOR) or hyperthermic (HYP) environmental conditions. Each arm began with three days of familiarization exercise followed by two random exercise trials with either a PHS or a control (CON). Then, participants crossed over to the second arm for NOR+PHS, NOR+CON, HYP+PHS, or HYP+CON. The PHS was prescribed according to the participants' fluid and sweat sodium losses. CON drank ad libitum of commercially-available electrolyte solution. Exercise trials consisted of two phases (1) 45 min constant workload; (2) high-intensity intermittent exercise (HIIT) until exhaustion. Fluids were only provided in phase 1. PHS had a significantly greater fluid intake (HYP+PHS 831.7 ± 166.4 g; NOR+PHS 734.2 ± 144.9 g) compared to CON (HYP+CON 369.8 ± 221.7 g; NOR+CON 272.3 ± 143.0 g), regardless of environmental conditions (p < 0.001). HYP+CON produced the lowest sweat sodium concentration (56.2 ± 9.0 mmol/L) compared to other trials (p < 0.001). HYP+PHS had a slower elevated thirst perception and a longer HIIT (765 ± 452 s) compared to HYP+CON (548 ± 283 s, p = 0.04). Thus, PHS reinforces fluid intake and successfully optimizes hydration status, regardless of environmental conditions. PHS may be or is an important factor in preventing negative physiological consequences during high-intensity exercise in the heat.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Equilíbrio Hidroeletrolítico
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Exercício Físico
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Temperatura Alta
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Nutrients
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China