The effect of a pre-exercise carbohydrate meal on immune responses to an endurance performance run

Ya Jun Chen, Stephen Heung Sang Wong*, Chun Kwok Wong, Ching Wan Lam, Ya Jun Huang, Parco Ming Fai Siu

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

21 Citations (Scopus)

Abstract

This study examined the effect of a pre-exercise meal with different glycaemic index (GI) and glycaemic load (GL) on immune responses to an endurance performance run. Eight men completed a preloaded 1 h run at 70% VO2max on a level treadmill followed by a 10 km performance run on three occasions. In each trial, one of the three prescribed isoenergetic meals, i.e. high GI and high GL (H-H), high GI and low GL (H-L), or low GI and low GL (L-L) was consumed by the subjects 2 h before exercise. Carbohydrate intake (% of energy intake), GI, and GL were 65%, 79.5, and 82.4 for H-H; 36%, 78.5, and 44.1 for H-L; 65%, 40.2, and 42.1 for L-L, respectively. The running time for the three trials was approximately 112 min at 70% VO2max for the first hour and 76% VO2max for the last 52 min. Consumption of pre-exercise high-carbohydrate meals (H-H and L-L) resulted in less perturbation of the circulating numbers of leucocytes, neutrophils and T lymphocyte subsets, and in decreased elevation of the plasma IL-6 concentrations immediately after exercise and during the 2 h recovery period compared with the H-L trial. These responses were accompanied by an attenuated increase in plasma IL-10 concentrations at the the end of the 2 h recovery period. The amount of carbohydrate consumed in the pre-exercise meal may be the most important influencing factor rather than the type of carbohydrate in modifying the immunoendocrine response to prolonged exercise.

Original languageEnglish
Pages (from-to)1260-1268
Number of pages9
JournalBritish Journal of Nutrition
Volume100
Issue number6
DOIs
Publication statusPublished - Dec 2008

Scopus Subject Areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

User-Defined Keywords

  • Carbohydrate
  • Glycaemic index
  • Glycaemic load
  • Performance run

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