The effects of different modes of prolonged exercise and different drinks on gastroesophageal
reflux and reflux-related symptoms were examined. In a cross-over design seven male
triathletes performed two tests at one week intervals (50 min periods of alternately
running, cycling and running at 70 - 75 % V˙O2max), with supplementation of either a conventional sports drink (7 % carbohydrates)
or tap water. Gastroesophageal reflux (percentage time and number of periods esophageal
pH < 4) was measured with an ambulant pH system before, during and after exercise.
Percentage reflux time (± SEM) during running, cycling, running and recovery was 24.0 ± 4.6,
8.2 ± 4.8, 17.6 ± 8.4 and 11.8 ± 4.0 with carbohydrates and 7.4 ± 2.9, 0 ± 0, 2.4 ± 1.4
and 0.2 ± 0.2 with water, respectively. Reflux lasted longer during exercise as compared
to the rest situation (5.6 ± 1.4 %), especially with carbohydrates, and lasted longer
with carbohydrates than with water (P < 0.05; Wilcoxon signed rank test). In general,
reflux lasted longer during running than during cycling (P < 0.05). Data on the number
of reflux periods are concordant to these results. Chest pain was reported by one
subject during running with carbohydrates. Heartburn during running was reported by
two subjects with water and by one with carbohydrates. In conclusion, physical exercise
increases gastroesophageal reflux, dependent on the mode of exercise and beverage
used.
Key words:
Strenuous exercise - carbohydrates - gastrointestinal symptoms
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Harry P. F. Peters
Department of Medical Physiology and Sports Medicine Utrecht University
P. O. Box 80043
NL-3508 TA Utrecht
The Netherlands
Telefon: + 31 (30) 2538900
Fax: + 31 (30) 2539036
eMail: h.p.f.peters@med.uu.nl
