NDLI: Fluid ingestion is more effective in preventing hyperthermia in aerobically trained than untrained individuals during exercise in the heat.

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Fluid ingestion is more effective in preventing hyperthermia in aerobically trained than untrained individuals during exercise in the heat.

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Fluid ingestion is more effective in preventing hyperthermia in aerobically trained than untrained individuals during exercise in the heat.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mora-Rodriguez, Ricardo Hamouti, Nassim Del Coso, Juan Ortega, Juan F.
Description	Country affiliation: Spain Author Affiliation: Mora-Rodriguez R ( University of Castilla - La Mancha, Exercise Physiology Laboratory, Toledo, Spain. Ricardo.Mora@uclm.es)
Abstract	It is unclear if fluid ingestion during exercise in the heat alleviates the thermoregulatory and cardiovascular strain similarly in aerobically trained and untrained individuals. It is also unknown at what exercise intensity the effects of rehydration are greater. Ten aerobically trained (T) and 10 healthy untrained (UT) subjects ([Formula: see text]O(2peak), 60 ± 6 vs. 44 ± 3 mL O(2)·kg(-1)·min(-1), respectively; P < 0.05) pedalled in a hot, dry environment (36 ± 1 °C; 25% ± 2% relative humidity; airflow, 2.5 m·s(-1)) at 40%, 60%, and 80% [Formula: see text]O(2peak) while ingesting fluids (Fluid). The results were compared with those from our previous study [Mora-Rodriguez et al., Eur. J. Appl. Physiol. 109(5): 973-981 (2010)] with no fluid ingestion (No Fluid). Subjects were not heat-acclimated. At 40% [Formula: see text]O(2peak), Fluid reduced rectal temperature (T(RE)) in T and UT (0.31 ± 0.08 and 0.32 ± 0.07 °C; respectively). At 60% [Formula: see text]O(2peak), Fluid reduced T(RE) in T more than in UT (0.30 ± 0.10 °C vs. 0.18 ± 0.10 °C; P < 0.05) but had no effect at 80% [Formula: see text]O(2peak) in any group. At similar relative intensity, heart rates (HR) were similar between groups. Fluid lowered heart rate (i.e., HR) similarly in the T and UT at 40% and 60% [Formula: see text]O(2peak) (11% and 6%, respectively; P < 0.05) but not at 80% [Formula: see text]O(2peak) (P > 0.05). At similar metabolic heat production (i.e., 60% for T vs. 80% [Formula: see text]O(2peak) for UT), Fluid lowered T(RE) only in the T individuals (P < 0.05). In summary, rehydration during low- and moderate-intensity exercise reduces T(RE) and HR more than during high-intensity exercise (80% [Formula: see text]O(2peak)) in T and UT subjects. Fluid replacement is more effective on preventing the rise in T(RE) in T than in UT individuals during moderate-intensity exercise (60% [Formula: see text]O(2peak)), as well as when exercising at a similar heat production rate.
File Format	HTM / HTML
ISSN	17155312
Issue Number	1
Volume Number	38
e-ISSN	17155320
Journal	Applied Physiology, Nutrition, and Metabolism
Language	English
Publisher	Canadian Science Publishing
Publisher Date	2013-01-01
Publisher Place	Canada
Access Restriction	Subscribed
Subject Keyword	Discipline Physiology Discipline Metabolism Discipline Nutritional Sciences Discipline Sports Medicine Exercise Physiology Fever Prevention & Control Fluid Therapy Methods Hot Temperature Analysis Of Variance Athletes Bicycling Body Temperature Body Temperature Regulation Heart Rate Hemoglobins Humans Physical Exertion Reference Values Time Factors Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Nutrition and Dietetics Physiology Endocrinology, Diabetes and Metabolism Physiology (medical) Sports Science

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