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Carbohydrate drinks and cycling performance

D W Bacharach1, S P von Duvillard, K W Rundell

  • 1Human Performance Laboratory, Syracuse University, NY.

The Journal of Sports Medicine and Physical Fitness
|June 1, 1994
PubMed
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Consuming carbohydrate (CHO) drinks during exercise improves cycling sprint performance. A 10% CHO solution enhances performance more than a 6.4% solution, demonstrating a dose-dependent effect.

Area of Science:

  • Sports Science and Exercise Physiology
  • Nutritional Biochemistry

Background:

  • Carbohydrate (CHO) intake during prolonged exercise is crucial for maintaining blood glucose levels and performance.
  • The optimal concentration of CHO in beverages for enhancing exercise performance is still debated.

Purpose of the Study:

  • To compare the effects of 0%, 6.4%, and 10% carbohydrate solutions on metabolic responses and sprint performance in cyclists.
  • To determine if a higher CHO concentration yields greater performance benefits.

Main Methods:

  • 12 well-trained cyclists completed three 2-hour exercise bouts at 65% VO2max, followed by a sprint performance test.
  • Participants consumed orange-flavored drinks with 0% (placebo), 6.4%, or 10% CHO (3 ml/kg) at 20-minute intervals.
  • Blood glucose, lactate, and core body temperature were monitored; sprint time was recorded.

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Main Results:

  • Blood glucose levels were significantly higher at 120 minutes with 6.4% and 10% CHO compared to placebo.
  • Sprint performance times were significantly faster with both 6.4% and 10% CHO compared to placebo.
  • The 10% CHO solution resulted in a faster sprint time than the 6.4% CHO solution.

Conclusions:

  • Ingesting carbohydrate drinks during prolonged exercise improves subsequent sprint performance in well-trained cyclists.
  • A 10% carbohydrate concentration provides a greater performance enhancement compared to a 6.4% concentration.