Impact of 3-day high and low dietary sodium intake on sodium status in response to exertional-heat stress: a double-blind randomized control trial.

European Journal of Applied Physiology
Alan J McCubbinRicardo J S Costa

Abstract

To determine the impact of altering dietary sodium intake for 3 days preceding exercise on sweat sodium concentration [Na+], and cardiovascular and thermoregulatory variables. Fifteen male endurance athletes (runners n = 8, cyclists n = 7) consumed a low (LNa, 15 mg kg-1 day-1) or high (HNa, 100 mg kg-1 day-1) sodium diet, or their usual free-living diet [UDiet, 46 (37-56) mg kg-1 day-1] for 3 days in a double-blind, randomized cross-over design, collecting excreted urine (UNa) and refraining from exercise. On day 4, they completed 2 h running at 55% [Formula: see text]O2max or cycling at 55% maximum aerobic power in Tamb 35 °C. Pre- and post-exercise blood samples were collected, and sweat from five sites using absorbent patches along the exercise protocol. UNa on days 2-3 pre-exercise [mean (95% CI) LNa 16 (12-19) mg kg-1 day-1, UDiet 46 (37-56) mg kg-1 day-1, HNa 79 (72-85) mg kg-1 day-1; p < 0.001] and pre-exercise aldosterone [LNa 240 (193-286) mg kg-1 day-1, UDiet 170 (116-224) mg kg-1 day-1, HNa 141 (111-171) mg kg-1 day-1; p = 0.001] reflected sodium intake as expected. Pre-exercise total body water was greater following HNa compared to LNa (p < 0.05), but not UDiet. Estimated whole-body sweat [Na+] following UDiet was ...Continue Reading

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Citations

Jan 1, 2020·International Journal of Sport Nutrition and Exercise Metabolism·Alan J McCubbinLouise M Burke
Mar 4, 2020·European Journal of Applied Physiology·Lindsay B Baker, Anthony S Wolfe
Nov 25, 2020·Physiological Reports·Hasan AlrefaiGordon G MacGregor
Dec 15, 2020·The Cochrane Database of Systematic Reviews·Niels Albert GraudalGesche Jurgens
Aug 15, 2021·Autonomic Neuroscience : Basic & Clinical·Alan J McCubbin

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Methods Mentioned

BETA
urine collection
ELISA

Software Mentioned

Power
SPSS

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