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)

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.

References

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

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