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Self-selecting fluid intake while maintaining high carbohydrate availability does not impair half-marathon

M J C Lee1, K M Hammond1, A Vasdev1

  • 1Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom.

International Journal of Sports Medicine
|August 22, 2014
PubMed
Summary
This summary is machine-generated.

Maintaining high carbohydrate availability while self-selecting fluid intake does not hinder half-marathon performance. However, glucose-fructose mixtures at lower intake levels reduce plasma glucose and carbohydrate oxidation rates.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Nutritional Science

Background:

  • Optimal fueling strategies are crucial for endurance performance.
  • Understanding the interplay between fluid intake, carbohydrate (CHO) availability, and race outcomes is essential for athletes.
  • Previous research suggests varying responses to different carbohydrate formulations and intake strategies.

Purpose of the Study:

  • To investigate if self-selected fluid intake, while maintaining high exogenous CHO availability, affects half-marathon performance.
  • To compare the effects of consuming a 6% CHO solution versus glucose or glucose-fructose gels on physiological markers and performance.
  • To examine the relationship between body mass loss and race time under different fueling conditions.

Main Methods:

  • Fifteen participants completed three half-marathons under controlled conditions.
  • Conditions included: guideline-based fluid intake with a 6% CHO solution (DRINK), and self-selected fluid intake with either glucose (G-GEL) or glucose-fructose (GF-GEL) gels.
  • Exogenous CHO availability was maintained at 60 g/h across all conditions, with varying fluid intakes and CHO formulations.

Main Results:

  • Half-marathon race times did not significantly differ between the DRINK, G-GEL, and GF-GEL conditions.
  • Fluid intake and percent body mass loss were significantly different across conditions.
  • Plasma glucose levels were lower in the GF-GEL condition, and total CHO oxidation tended to be lower (P=0.06) in this trial.

Conclusions:

  • Self-selecting fluid intake does not impair half-marathon performance when exogenous CHO availability is maintained.
  • Consuming glucose-fructose mixtures in sub-optimal amounts can reduce plasma glucose and total CHO oxidation rates.
  • Athletes can personalize fluid intake strategies without compromising performance, provided adequate CHO availability is ensured.