A randomized, cross-over trial assessing effects of beverage sodium concentration on plasma sodium concentration and plasma volume during prolonged exercise in the heat.

ABSTRACT:

Purpose

This study assessed whether increasing sodium in a sports drink above that typical (~ 20 mmol L^-1) affects plasma sodium and volume responses during prolonged exercise in the heat.

Methods

Endurance trained males (N = 11, 36 ± 14 y, 75.36 ± 5.30 kg, [Formula: see text]O_2max 60 ± 3 mL min^-1 kg^-1) fulfilled requirements of the study including one 1-h exercise pre-trial, to estimate fluid losses (to prescribe fluid intake), and two, experimental trials (3-h or until tolerance), in random order, cycling (55% [Formula: see text]O_2max, 34 °C, 65% RH). Beverages contained 6% carbohydrate and either 21 mmol L^-1 (Low Na⁺) or 60 mmol L^-1 sodium (High Na⁺). Analyses included linea

SUBMITTER: Wijering LAJ 

PROVIDER: S-EPMC9813217 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature