Effect of carbohydrate intake on half-marathon performance of well-trained runners

Louise M Burke, Clare Wood, David B Pyne, Richard D. Telford, Philo U Saunders

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Eighteen highly-trained runners ran two half marathons in mild environmental conditions, 3 wk apart, consuming either 426 +/- 227 mL of a flavored placebo drink (PLACEBO) or an equivalent volume of water (386 +/- 185 mL) and a commercial gel (GEL) supplying 1.1 +/- 0.2 g/kg body mass (BM) carbohydrate (CHO). Voluntary consumption of this fluid was associated with a mean BM change of approximately 2.4%. Runners performed better in their second race by 0.9% or 40 s (P = 0.03). Three runners complained of gastrointestinal discomfort in GEL trial, which produced a clear impairment of half-marathon performance by 2.4% or 105 s (P=0.03). The effect of GEL on performance was trivial: time was improvedby 0.3% or 14 s compared with PLACEBO (P = 0.52). Consuming the gel was associated with a 2.4% slower time through the 2 x 200 m feed zone; adding a trivial approximately 2 s to race time. Although benefits to half marathon performance were not detected, the theoretical improvement during 1-h exercise with CHO intake merits further investigation.

Original languageEnglish
Pages (from-to)573-589
Number of pages17
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Volume15
Issue number6
Publication statusPublished - Dec 2005
Externally publishedYes

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Carbohydrates
Gels
Placebos
Exercise
Water

Cite this

Burke, Louise M ; Wood, Clare ; Pyne, David B ; Telford, Richard D. ; Saunders, Philo U. / Effect of carbohydrate intake on half-marathon performance of well-trained runners. In: International Journal of Sport Nutrition and Exercise Metabolism. 2005 ; Vol. 15, No. 6. pp. 573-589.
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Effect of carbohydrate intake on half-marathon performance of well-trained runners. / Burke, Louise M; Wood, Clare; Pyne, David B; Telford, Richard D.; Saunders, Philo U.

In: International Journal of Sport Nutrition and Exercise Metabolism, Vol. 15, No. 6, 12.2005, p. 573-589.

Research output: Contribution to journalArticle

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