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Int J Sports Med 2008; 29(11): 878-882
DOI: 10.1055/s-2008-1038620
Physiology & Biochemistry

© Georg Thieme Verlag KG Stuttgart · New York

Fluid Tolerance while Running: Effect of Repeated Trials

G. P. Lambert1 , J. Lang1 , A. Bull1 , J. Eckerson1 , S. Lanspa2 , J. O'Brien2
  • 1Department of Exercise Science, Creighton University, Omaha, Nebraska, United States
  • 2Department of Medicine, Creighton University, Omaha, Nebraska, United States
Further Information

Publication History

accepted after revision April 14, 2008

Publication Date:
29 May 2008 (online)

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Abstract

This study assessed tolerance to fluid ingestion with repeated sessions of drinking while running. Runners (n = 7; age 22 ± 2 yr; V˙O2max = 54.4 ± 7.1 ml/kg/min) performed six 90-min runs (65 % V˙O2max; separated by 7 – 11 days). During run 1, subjects drank a glucose-electrolyte solution ad libitum for 1 min every 10 min. During runs 2 – 6, subjects drank a volume of the solution every 10 min equal to their sweat production over 10 min during run 1. Stomach comfort (1 – 4 scale) and gastrointestinal symptoms were also assessed every 10 min. Gastric emptying rate was determined in runs 2 and 6. Subjects consumed more (p < 0.05) fluid during runs 2 – 6 (mean ± SD; 1247 ± 162 ml), than during run 1 (508 ± 476 ml). Stomach comfort improved (p < 0.05) on runs 5 and 6 (1.7 ± 0.5 mean ranks) compared to run 2 (2.3 ± 0.5 mean ranks). Gastric emptying rate was not different between runs 2 and 6 (12.0 ± 1.9 ml/min vs. 12.3 ± 2.3 ml/min, respectively). These results indicate repeated sessions of drinking at a rate matching sweat rate improves stomach comfort, however, gastric emptying rate does not change under such conditions.

Key words

rehydration - exercise - gastric emptying

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Dr. Ph.D. G. Patrick Lambert

Creighton University
Department of Exercise Science

2500 California Plaza, Room 225 KFC

Omaha, Nebraska 68178

United States

Phone: + 1 40 22 80 24 20

Fax: + 1 40 22 80 47 32

Email: plambert@creighton.edu