The Effect of Two Sports Drinks and Water on GI Complaints and Performance During an 18-km Run

Abstract

Gastrointestinal (GI) complaints are frequently experienced during running. Sports drinks to prevent dehydration and hypoglycemia during exercise are generally used. The aim was to investigate the effect of 3 different drinks on GI complaints and performance during competitive running in a controlled field study. Ninety-eight well-trained subjects (90 M, 8 F, age 41 ± 8 y) performed a competitive 18-km run three times within 8 days. The study was a controlled, standardized field experiment following a randomized, crossover design. Three different drinks were compared: water, a sports drink (CES), and a sports drink with added 150 mg/l caffeine (CAF). The incidence of GI complaints and the effect of the drinks on performance was studied. Each subject consumed 4 times 150 ml as follows: at the start, after 4.5 km, 9 km, and 13.5 km. Fluid intake was controlled. Incidence and intensity of GI complaints during the run were determined using a 10 points scale questionnaire. There were no significant differences in performance between the 3 drinks. Run time (18 km, mean ± SD): WAT 1 : 18 : 03 ± 08 : 30, CES 1 : 18 : 23 ± 08 : 47, CAF 1 : 18 : 03 ± 08 : 42. The use of carbohydrate-containing sports drinks led to higher incidences of all types of GI complaints compared to water. Significant differences (p < 0.05) were reached for flatulence; incidence: WAT 17.9 %, CES 28.6 %, CAF 30.6 %, and reflux; incidence: WAT 55.7 %, CES 78.6 %, CAF 72.5 %. There were no significant differences in intensity of the GI complaints. Addition of caffeine to CES had no effect on GI complaints, compared to CES alone. We conclude that sports drinks used during an 18-km run in cool environmental conditions do not support the performance better than mineral water. The use of sports drinks during an 18-km run leads to a higher incidence of both upper and lower GI complaints compared to water. Addition of caffeine to the sports drink has no effect on either running performance or GI complaints.

Exercise - sports drinks - performance - caffeine - carbohydrates

References

• 1 Brouns F, Senden J, Beckers E J, Saris W H. Osmolarity does not affect the gastric emptying rate of oral rehydration solutions.  J Parenter Enteral Nutr. 1995;  19 403-406
• 2 Bruce C R, Anderson M E, Fraser S F, Stepto N K, Klein R, Hopkins W G, Hawley J A. Enhancement of 2000-m rowing performance after caffeine ingestion.  Med Sci Sports Exerc. 2000;  32 1958-1963
• 3 Coyle E F, Hagberg J M, Hurley B F, Martin W H, Ehsani A A, Holloszy J O. Carbohydrate feeding during prolonged strenuous exercise can delay fatigue.  J Appl Physiol. 1983;  55 230-235
• 4 Graham T E, Rush J W, van Soeren M H. Caffeine and exercise: metabolism and performance.  Can J Appl Physiol. 1994;  19 111-138
• 5 Harris A, Martin B J. Increased abdominal pain during final examinations.  Dig Dis Sci. 1994;  39 104-108
• 6 Jeukendrup A, Brouns F, Wagenmakers A J, Saris W H. Carbohydrate-electrolyte feedings improve 1 h time trial cycling performance.  Int J Sports Med. 1997;  18 125-129
• 7 Keeffe E B, Lowe D K, Gross J R, Wayne R. Gastrointestinal complaints of marathon runners.  West J Med. 1984;  141 481-484
• 8 Kovacs E M, Stegen J HCH, Brouns F. Effect of caffeinated drinks on substrate metabolism, caffeine excretion, and performance.  J Appl Physiol. 1998;  85 709-715
• 9 MacIntosh B R, Wright B M. Caffeine ingestion and performance of a 1 500-metre swim.  Can J Appl Physiol. 1995;  20 168-177
• 10 Neufer P D, Young A J, Sawka M N. Gastric emptying during exercise: effects of heat stress and hypohydration.  Eur J Appl Physiol. 1989;  58 433-439
• 11 Pasman W J, van Baak M A, Jeukendrup A E, de Haan A. The effect of different dosages of caffeine on endurance performance time.  Int J Sports Med. 1995;  16 225-230
• 12 Peters H PF, Bos M, Seebregts L, Akkermans L M, van Berge Henegouwen G P, Bol E, Mostered W L, de Vries W R. Gastrointestinal symptoms in long-distance runners, cyclists, and triathletes: prevalence, medication, and etiology.  Am J Gastroenterol. 1999;  94 1570-1581
• 13 Peters H PF, van Schelven F W, Vestappen P A, de Boer R W, Bol E, Erich W B, van der Togt C R, de Vries W R. Gastrointestinal problems as a function of carbohydrate supplements and mode of exercise.  Med Sci Sports Exerc. 1993;  25 1211-1224
• 14 Rehrer N J, Meijer G A. Biomechanical vibration of the abdominal region during running and bicycling.  J Sports Med Phys Fitness. 1991;  31 231-234
• 15 Rehrer N J, Brouns F, Beckers E J, Frey W O, Villiger B, Riddoch C J, Menheere P PCA, Saris W HM. Physiological changes and gastro-intestinal complaints as a result of ultra-endurance running.  Eur J Appl Physiol. 1992;  64 1-8
• 16 Rehrer N J, van Kemenade M, Meester W, Brouns F, Saris W H. Gastrointestinal complaints in relation to dietary intake in triathletes.  Int J Sport Nutr. 1992;  2 48-59
• 17 Rehrer N J, Smets A, Reynaert H, Goes E, De Meirleir K. Effect of exercise on portal vein blood flow in man.  Med Sci Sports Exerc. 2001;  33 1533-1537
• 18 Riddoch C, Trinick T R. Gastrointestinal disturbances in marathon runners.  Br J Sports Med. 1988;  22 71-74
• 19 Vandewalle H C, Lacombe J C, Lereivre A, Poirot C. Blood viscosity after 1 h submaximal exercise with and without drinking.  Int J Sports Med. 1988;  9 104-107
• 20 Van Nieuwenhoven M A, Vriens B EPJ, Brummer R JM, Brouns F. Effect of dehydration on gastrointestinal function at rest and during exercise in humans.  Eur J Appl Physiol. 2000;  83 578-584
• 21 Van Nieuwenhoven M A, Brummer R JM, Brouns F. Gastrointestinal function during exercise: comparison of water, sports drink, and sports drink with caffeine.  J Appl Physiol. 2000;  89 1079-1085
• 22 Van Nieuwenhoven M A. Gastrointestinal function during physical exercise. Maastricht University; PhD-thesis 1999
• 23 Wagenmakers A J, Brouns F, Saris W H, Halliday D. Oxidation rates of orally ingested carbohydrates during prolonged exercise in men.  J Appl Physiol. 1993;  75 2774-2780
• 24 Worme J D, Doubt T J, Singh A, Ryan C J, Moses F M, Deuster P A. Dietary patterns, gastrointestinal complaints, and nutrition knowledge of recreational triathletes.  Am J Clin Nutr. 1990;  51 690-697
• 25 Worobetz L J, Gerrard D F. Gastrointestinal complaints during exercise and endurance athletes: incidence and speculations of the etiology.  NZ Med J. 1985;  98 644-646