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Nutrients 2012, 4(8), 949-966; doi:10.3390/nu4080949
Article

Pre-Exercise Hyperhydration-Induced Bodyweight Gain Does Not Alter Prolonged Treadmill Running Time-Trial Performance in Warm Ambient Conditions

1,2
,
1,2
,
1,2
,
2
 and
1,2,*
1 Research Centre on Aging, University of Sherbrooke, Sherbrooke, PQ J1H 4C4, Canada 2 Faculty of Physical Education and Sports, University of Sherbrooke, Sherbrooke, PQ J1K 2R1, Canada
* Author to whom correspondence should be addressed.
Received: 9 May 2012 / Revised: 17 July 2012 / Accepted: 7 August 2012 / Published: 13 August 2012
(This article belongs to the Special Issue Advances in Sports Nutrition)
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Abstract

This study compared the effect of pre-exercise hyperhydration (PEH) and pre-exercise euhydration (PEE) upon treadmill running time-trial (TT) performance in the heat. Six highly trained runners or triathletes underwent two 18 km TT runs (~28 °C, 25%–30% RH) on a motorized treadmill, in a randomized, crossover fashion, while being euhydrated or after hyperhydration with 26 mL/kg bodyweight (BW) of a 130 mmol/L sodium solution. Subjects then ran four successive 4.5 km blocks alternating between 2.5 km at 1% and 2 km at 6% gradient, while drinking a total of 7 mL/kg BW of a 6% sports drink solution (Gatorade, USA). PEH increased BW by 1.00 ± 0.34 kg (P < 0.01) and, compared with PEE, reduced BW loss from 3.1% ± 0.3% (EUH) to 1.4% ± 0.4% (HYP) (P < 0.01) during exercise. Running TT time did not differ between groups (PEH: 85.6 ± 11.6 min; PEE: 85.3 ± 9.6 min, P = 0.82). Heart rate (5 ± 1 beats/min) and rectal (0.3 ± 0.1 °C) and body (0.2 ± 0.1 °C) temperatures of PEE were higher than those of PEH (P < 0.05). There was no significant difference in abdominal discomfort and perceived exertion or heat stress between groups. Our results suggest that pre-exercise sodium-induced hyperhydration of a magnitude of 1 L does not alter 80–90 min running TT performance under warm conditions in highly-trained runners drinking ~500 mL sports drink during exercise.
Keywords: hyperhydration; hydration; exercise; running; endurance performance; running economy hyperhydration; hydration; exercise; running; endurance performance; running economy
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Gigou, P.-Y.; Dion, T.; Asselin, A.; Berrigan, F.; Goulet, E.D.B. Pre-Exercise Hyperhydration-Induced Bodyweight Gain Does Not Alter Prolonged Treadmill Running Time-Trial Performance in Warm Ambient Conditions. Nutrients 2012, 4, 949-966.

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