Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Repeatability of Ad Libitum Fluid Intake During Repeated 1 h Walking/Jogging Exercise Sessions Conducted Under Hot Ambient Conditions

Eric D.B. Goulet
* ORCID logo ,
Pascale Claveau
,
Ivan L. Simoneau
,
Thomas A. Deshayes
ORCID logo ,
Antoine Jolicoeur-Desroches
ORCID logo ,
Fedi Aloui
ORCID logo ,
Martin D. Hoffman
Version 1 : Received: 26 September 2023 / Approved: 27 September 2023 / Online: 27 September 2023 (10:36:15 CEST)

A peer-reviewed article of this Preprint also exists.

Goulet, E.D.B.; Claveau, P.; Simoneau, I.L.; Deshayes, T.A.; Jolicoeur-Desroches, A.; Aloui, F.; Hoffman, M.D. Repeatability of Ad Libitum Water Intake during Repeated 1 h Walking/Jogging Exercise Sessions Conducted under Hot Ambient Conditions. Nutrients 2023, 15, 4500. Goulet, E.D.B.; Claveau, P.; Simoneau, I.L.; Deshayes, T.A.; Jolicoeur-Desroches, A.; Aloui, F.; Hoffman, M.D. Repeatability of Ad Libitum Water Intake during Repeated 1 h Walking/Jogging Exercise Sessions Conducted under Hot Ambient Conditions. Nutrients 2023, 15, 4500.

Abstract

A drinking strategy aiming to replace a given percentage of the sweat losses incurred during exercise should result in reproducible fluid intake volume and, hence, fluid balance from one exercise session to the other performed under similar scenarios. Whether this may also be the case with ad libitum drinking during exercise is unclear. We characterized the repeatability of ad libitum fluid intake during repeated 1 h exercise sessions and examine its effect over time on fluid balance and selected physiological functions and perceptual sensations. Twelve (3 women) healthy individuals participated in this study. At weekly intervals, they completed 4, 2 x 30 min walking/jogging exercise bouts (55% VO2max, 40°C, 20-30% relative humidity) interspersed by a 3 min recovery period. During exercise, participants replaced water (20°C) ad libitum. There were no significant differences among the 4 exercise sessions for absolute fluid intake volume (~ 1000 mL · h-1), percent body mass loss (~ 0.4%), sweat rate (~ 1300 mL · h-1) and percent of sweat loss replaced by fluid intake (~ 80%). Heart rate, rectal temperature and perceived thirst and heat stress did not differ significantly between the first and fourth exercise session. Perceived exertion was significantly lower during the fourth vs. the first exercise session, but the difference was trivial, < 1 arbitrary unit. In conclusion, ad libitum fluid intake during 4 successive identical 1 h walking/jogging sessions conducted in the heat will result in similar fluid intake volumes and perturbations in fluid balance, heart rate, rectal temperature and perceived thirst, heat stress and exertion.

Keywords

dehydration; drinking pattern; exercise; heat stress; physiological and perceptual functions

Subject

Biology and Life Sciences, Other

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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