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Exercise performance as a function of semi-solid and liquid carbohydrate feedings during prolonged exercise

H P Peters1, W F van Schelven, P A Verstappen

  • 1Department of Medical Physiology and Sports Medicine, University of Utrecht, The Netherlands.

International Journal of Sports Medicine
|February 1, 1995
PubMed
Summary

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Liquid carbohydrate feeding significantly improved endurance exercise performance and maximum test time compared to semi-solid feeding or placebo. Dietary intake impacts performance differently across various exercise tests.

Area of Science:

  • Sports Science
  • Exercise Physiology
  • Nutrition Science

Background:

  • Carbohydrate intake is crucial for endurance athletes.
  • The form of carbohydrate delivery (liquid vs. semi-solid) may influence exercise performance.
  • Optimal fueling strategies are essential for maximizing athletic output.

Purpose of the Study:

  • To compare the effects of semi-solid versus liquid carbohydrate feeding on endurance exercise performance.
  • To evaluate the impact of different carbohydrate formulations on maximal test time and power output.
  • To identify factors influencing exercise performance in triathletes.

Main Methods:

  • Thirty-two male triathletes completed three maximal exercise trials at 75% VO2max.
  • Trials involved cycling and running bouts with either semi-solid carbohydrate feeding (S), liquid carbohydrate feeding (F), or a liquid placebo (P).

Related Experiment Videos

  • Performance metrics included maximal test time (MTT) and mean power output (W1, Wend), analyzed using survival analysis and regression.

    • Main Results:

    • Liquid feeding (F) resulted in a significantly longer median MTT (180 min) compared to semi-solid (S, 126 min) and placebo (P, 120 min).
    • Mean power output was significantly higher with liquid feeding (F) compared to placebo (P).
    • Dietary intake significantly contributed to MTT and Wend, but not W1, indicating varied effects across performance measures.

    Conclusions:

    • Liquid carbohydrate feeding enhances endurance exercise performance more effectively than semi-solid feeding.
    • The form of carbohydrate delivery plays a role in optimizing athletic performance during prolonged exercise.
    • Fueling strategies should be tailored based on the specific demands of different exercise performance tests.