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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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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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Related Experiment Video

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Determining the Contribution of the Energy Systems During Exercise
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The Bioenergetics of Exercise.

P Darrell Neufer1

  • 1East Carolina Diabetes and Obesity Institute, Departments of Physiology and Kinesiology, Brody School of Medicine, East Carolina University, Greenville, NC 27834.

Cold Spring Harbor Perspectives in Medicine
|May 12, 2017
PubMed
Summary

Understanding cellular energy transfer is key to exercise science. This review explores the redox and bioenergetic principles governing electron flow and ATP synthesis, crucial for sustained physical activity.

Area of Science:

  • Physiology
  • Bioenergetics
  • Exercise Science

Background:

  • Animals exhibit remarkable physical activity capabilities due to efficient energy transfer systems.
  • Understanding physiological responses to exercise requires knowledge of redox and bioenergetic principles.
  • Electron flow and its coupling to adenosine triphosphate (ATP) synthesis are fundamental to cellular energy.

Purpose of the Study:

  • To explain the thermodynamic forces driving cellular energy charge.
  • To describe how cellular energy transfer systems adapt to exercise demands.
  • To provide a foundation for understanding exercise physiology and bioenergetics.

Main Methods:

  • This review synthesizes existing literature on bioenergetics and redox principles.
  • It focuses on the theoretical underpinnings of energy transfer in biological systems.

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  • No new experimental data were generated; it is a conceptual review.

    • Main Results:

    • Cellular energy charge is maintained by specific thermodynamic driving forces.
    • Energy transfer systems dynamically respond to increased energy demands during exercise.
    • The efficiency of electron transport and ATP synthesis is critical for endurance.

    Conclusions:

    • A thorough grasp of bioenergetic and redox principles is essential for comprehending exercise physiology.
    • Maintaining cellular energy charge is a primary goal of physiological adaptations to physical activity.
    • This review establishes a framework for further research into exercise-induced metabolic adjustments.