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Related Experiment Videos

Exogenous carbohydrate oxidation from different carbohydrate sources during exercise

W H Saris1, B H Goodpaster, A E Jeukendrup

  • 1Department of Human Biology, University of Limburg, Maastricht, The Netherlands.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 1, 1993
PubMed
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Soluble carbohydrates are oxidized faster during exercise than insoluble ones. Using a soluble tracer with insoluble carbohydrates can overestimate oxidation rates.

Area of Science:

  • Exercise Physiology
  • Nutritional Biochemistry
  • Metabolic Research

Background:

  • Exogenous carbohydrate oxidation is crucial for endurance performance.
  • Understanding the impact of carbohydrate solubility on oxidation rates is vital for sports nutrition.

Purpose of the Study:

  • To investigate the oxidation rates of soluble versus insoluble carbohydrates during cycling exercise.
  • To examine the effect of tracer solubility on exogenous carbohydrate oxidation measurements.

Main Methods:

  • Cycling exercise at 60% maximum work output for 150 minutes.
  • Administered water, soluble corn starch (SOL), and insoluble corn starch (In-SOL) with and without a 13C tracer.
  • Measured exogenous carbohydrate oxidation rates using isotope ratio mass spectrometry.

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Main Results:

  • Mean and peak exogenous carbohydrate oxidation rates were significantly higher for SOL compared to In-SOL.
  • Total oxidized carbohydrate was significantly greater in the SOL trial (126g) than the In-SOL trial (75g).
  • Using a soluble tracer with insoluble starch overestimated oxidation rates.

Conclusions:

  • Soluble carbohydrates are oxidized at a higher rate during exercise than insoluble carbohydrates.
  • The choice of tracer solubility can significantly influence the accuracy of exogenous carbohydrate oxidation measurements.
  • Findings suggest optimizing carbohydrate form for enhanced fuel utilization during prolonged exercise.