Int J Sports Med 1995; 16(2): 105-113
DOI: 10.1055/s-2007-972974
Nutrition

© Georg Thieme Verlag Stuttgart · New York

Exercise Performance as a Function of Semi-Solid and Liquid Carbohydrate Feedings During Prolonged Exercise

H. P. F. Peters, W. F. van Schelven, P. A. Verstappen, R. W. de Boer, E. Bol, W. B. M. Erich, C. R. van der Togt, W. R. de Vries
  • Department of Medical Physiology and Sports Medicine, University of Utrecht, Utrecht, The Netherlands
Further Information

Publication History

Publication Date:
09 March 2007 (online)

Abstract

Aim of this study was to examine the effects of a semi-solid and a liquid carbohydrate feeding on exercise performance. Thirty-two male triathletes performed three exercise trials (3 hours maximal at 75 % VO2max) with either a semi-solid feeding (S), an iso-caloric liquid feeding (F) or a liquid placebo (P). Exercise consisted of cycling (bout 1 and 3) and running (bout 2 and 4). Survival analysis revealed that the median maximum test time (MTT) with F, S and P was 180, 126 and 120 min, respectively. Median MTT was longer with F than with S (sign-test; p<0.05) or P (p< 0.001), with no difference between S and P. Mean power output during supra-maximal tests after bout 2 (W1) and at the end of exercise (Wend) were 371, 365, 362 and 334, 332, 321 W with F, S and P, respectively. Differences between F and P were significant (p<0.01). Regression analysis identified five variables that were associated with 93 % of the variance in MTT. The variance in W| was explained for 83 % by three variables. Wend) was explained (90 %) by three variables. A significant dietary contribution to MTT and Wend was found, but not to W1, This suggests that the influence of the feedings on performance is different among performance tests.

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