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Related Concept Videos

Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
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Redox interventions to increase exercise performance.

Michael B Reid1

  • 1College of Health and Human Performance, University of Florida, Gainesville, FL, 32611, USA. michael.reid@ufl.edu.

The Journal of Physiology
|November 21, 2015
PubMed
Summary
This summary is machine-generated.

Redox-active supplements like reduced thiol donors or dietary nitrates can enhance exercise endurance. These interventions may improve performance for athletes and individuals with activity limitations due to illness or aging.

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Area of Science:

  • Exercise Physiology
  • Biochemistry
  • Nutritional Science

Background:

  • Skeletal muscle produces reactive oxygen species (ROS) and nitric oxide (NO) derivatives, influencing muscle function.
  • Strenuous exercise elevates oxidant production, potentially limiting endurance performance.
  • Redox interventions modulating ROS or NO show potential for performance enhancement.

Purpose of the Study:

  • To review the efficacy of different redox-active supplements in enhancing exercise endurance.
  • To explore the mechanisms by which antioxidants, reduced thiol donors, and dietary nitrates impact performance.
  • To discuss the implications of these findings for athletes and clinical populations.

Main Methods:

  • Literature review of studies investigating antioxidant, reduced thiol donor, and dietary nitrate supplementation.
  • Analysis of biochemical and physiological responses to exercise following supplementation.
  • Evaluation of performance outcomes, including endurance and fatigue resistance.

Main Results:

  • Vitamins and nutriceuticals may buffer ROS but often fail to enhance performance.
  • Reduced thiol donors have demonstrated the capacity to delay fatigue and increase endurance.
  • Dietary nitrate supplementation (e.g., beetroot juice) can reduce exercise oxygen cost and improve endurance performance.

Conclusions:

  • Exercise endurance can be augmented by specific redox-active supplements, notably reduced thiol donors and dietary nitrates.
  • These supplements offer potential benefits for athletes seeking enhanced performance.
  • Interventions increasing endurance may also benefit individuals with activity limitations due to aging or illness.