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Related Concept Videos

Pyruvate Oxidation01:15

Pyruvate Oxidation

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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.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
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Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Fates of Pyruvate01:20

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Pyruvate is the end product of glycolysis, where glucose is oxidized to pyruvate, simultaneously reducing NAD+ to NADH. Two molecules of ATP are also produced by substrate-level phosphorylation.
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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Other Glycolytic Pathways01:24

Other Glycolytic Pathways

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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Products of the Citric Acid Cycle00:53

Products of the Citric Acid Cycle

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The cells of most organisms—including plants and animals—obtain usable energy through aerobic respiration, the oxygen-requiring version of cellular respiration. Aerobic respiration consists of four major stages: glycolysis, pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation. The third major stage, the citric acid cycle, is also known as the Krebs cycle or tricarboxylic acid (TCA) cycle.
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Assessing Energy Substrate Oxidation In Vitro with 14CO2 Trapping
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Eccentric Exercise Causes Specific Adjustment in Pyruvate Oxidation by Mitochondria.

Stéphanie Hody1, Blair E Warren2, Dominique-Marie Votion3

  • 1Department of Motricity Sciences, University of Liège, Liège, BELGIUM.

Medicine and Science in Sports and Exercise
|March 23, 2022
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Summary
This summary is machine-generated.

Eccentric exercise significantly reduces mitochondrial oxidative phosphorylation capacity, particularly in the distal quadriceps muscle, 48 hours post-exercise. This suggests specific impacts on pyruvate metabolism following eccentric exercise.

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Area of Science:

  • Exercise physiology
  • Mitochondrial biology
  • Skeletal muscle adaptation

Background:

  • Eccentric exercise effects on mitochondrial function are poorly understood.
  • Skeletal muscle adaptations to different exercise types require further investigation.

Purpose of the Study:

  • To investigate changes in skeletal muscle mitochondrial respiration after a single bout of eccentric treadmill exercise.
  • To identify specific alterations in mitochondrial function related to eccentric exercise.

Main Methods:

  • Mice underwent eccentric (downhill) or concentric (uphill) running protocols.
  • Quadriceps muscles were analyzed for mitochondrial respiration 48 hours post-exercise using high-resolution respirometry.

Main Results:

  • Eccentric exercise induced higher plasma creatine kinase, indicating muscle damage.
  • A significant decrease in oxidative phosphorylation capacity via the NADH pathway (pyruvate + malate) was observed in both proximal and distal quadriceps.
  • This reduction was more pronounced in the distal muscle portion.

Conclusions:

  • Eccentric exercise specifically impairs pyruvate mitochondrial transport and/or oxidation 48 hours post-exercise.
  • The observed alterations in mitochondrial function are predominantly in the distal white muscle portion.
  • This study enhances understanding of mitochondrial adaptations to eccentric exercise.