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Related Experiment Videos

Carbohydrate feedings 1 h before exercise improves cycling performance.

W M Sherman1, M C Peden, D A Wright

  • 1Exercise Physiology Laboratory, School of Health, Physical Education, and Recreation, Ohio State University, Columbus.

The American Journal of Clinical Nutrition
|November 1, 1991
PubMed
Summary

Consuming liquid carbohydrates before exercise enhances performance. Both lower (LC) and higher (HC) doses improved time-trial performance by increasing carbohydrate oxidation during prolonged exercise.

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Area of Science:

  • Sports Nutrition
  • Exercise Physiology
  • Metabolic Studies

Background:

  • Pre-exercise carbohydrate intake is crucial for endurance athletes.
  • Optimal timing and dosage for liquid carbohydrate intake remain areas of investigation.

Purpose of the Study:

  • To determine the effects of two liquid carbohydrate doses on metabolic responses and exercise performance.
  • To compare the efficacy of 1.1 g/kg (LC) and 2.2 g/kg (HC) carbohydrate intake versus placebo (P).

Main Methods:

  • Participants consumed LC, HC, or P liquid carbohydrate 1 hour before exercise.
  • Subjects performed a 90-minute cycling bout at 70% VO2max followed by a performance trial.
  • Blood glucose and insulin levels were monitored, and substrate oxidation was assessed.

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Main Results:

  • Distinct blood glucose and insulin responses were observed across trials.
  • Total carbohydrate oxidation was significantly higher in both LC and HC groups compared to P.
  • Time-trial performance was significantly improved in both LC and HC conditions.

Conclusions:

  • Liquid carbohydrate intake (1.1-2.2 g/kg) 60 minutes before prolonged, moderate-intensity exercise enhances performance.
  • Improved performance is likely due to increased carbohydrate oxidation, despite potential initial drops in blood glucose and elevated insulin.
  • This strategy supports endurance exercise by optimizing fuel utilization.