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Related Concept Videos

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After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
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Nearly all the energy used by cells comes from the bonds that make up complex organic compounds. These organic compounds are broken down into simpler molecules, such as glucose. As a result, cells extract energy from glucose over many chemical reactions—a process called cellular respiration.
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Related Experiment Video

Updated: Jan 18, 2026

Assessing Energy Substrate Oxidation In Vitro with 14CO2 Trapping
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Substrate Oxidation Does Not Influence Middle Distance Running Performance: A Randomized Controlled Crossover Trial.

Alex Buga1, Jeffrey D Buxton2, Emma Plank2

  • 1Department of Human Sciences, The Ohio State University, Columbus, OH 43210, USA.

Nutrients
|September 13, 2025
PubMed
Summary
This summary is machine-generated.

Preferred substrate oxidation does not significantly impact middle-distance running performance, even with distinct metabolic profiles. This study challenges previous notions about substrate utilization determining aerobic capacity.

Keywords:
carbohydrateenergy barketogenicsupplementationtime trial

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Area of Science:

  • Exercise Physiology
  • Nutritional Science
  • Sports Performance

Background:

  • Recent research questions the role of preferred substrate oxidation in exercise performance.
  • Controlling for glycogen and exercise-induced hypoglycemia (EIH) is crucial for accurate performance assessment.

Purpose of the Study:

  • To investigate the impact of pre-exercise meals (low-carbohydrate high-fat vs. high-carbohydrate low-fat) on middle-distance running performance.
  • To determine if preferred substrate oxidation influences performance in the fed state.

Main Methods:

  • Randomized crossover study with recreational runners (n=30).
  • Participants completed 5K and 10K time trials after consuming either LCHF or HCLF isocaloric meals.
  • Measurements included time trial performance, substrate oxidation, blood metabolites, heart rate, and perceived exertion.

Main Results:

  • LCHF meals significantly altered substrate oxidation (increased fat oxidation, decreased RER) compared to HCLF.
  • Despite metabolic differences, 5K and 10K time trial performances were similar between LCHF and HCLF conditions.
  • LCHF meals increased satiety, while HCLF meals led to a rise in blood glucose.

Conclusions:

  • Preferred substrate oxidation is not a primary determinant of middle-distance aerobic performance.
  • Findings support recent evidence challenging the traditional view of substrate utilization's role in performance.