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Related Concept Videos

Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

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...
NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
Myocarditis I: Introduction01:21

Myocarditis I: Introduction

Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Sympathetic Activation01:16

Sympathetic Activation

The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
Exercise Stress Test01:26

Exercise Stress Test

Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes

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Related Experiment Video

Updated: Jun 10, 2026

A Murine Closed-chest Model of Myocardial Ischemia and Reperfusion
13:42

A Murine Closed-chest Model of Myocardial Ischemia and Reperfusion

Published on: July 17, 2012

Acute exercise activates myocardial nuclear factor kappa B.

Marko Balan1, Marius Locke

  • 1Faculty of Physical Education and Health, University of Toronto, 55 Harbord Street, Toronto, ON, M5S 2W6, Canada.

Cell Stress & Chaperones
|August 10, 2010
PubMed
Summary

Exercise activates myocardial Nuclear Factor kappa B (NF-κB), a key transcription factor. Different exercise intensities recruit distinct NF-κB subunits, suggesting intensity-dependent molecular responses in the heart.

Related Experiment Videos

Last Updated: Jun 10, 2026

A Murine Closed-chest Model of Myocardial Ischemia and Reperfusion
13:42

A Murine Closed-chest Model of Myocardial Ischemia and Reperfusion

Published on: July 17, 2012

Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Exercise Science

Background:

  • Exercise intensity modulates the myocardial stress response, impacting cellular processes.
  • Nuclear Factor kappa B (NF-κB) is a crucial transcription factor regulating inflammation, immunity, and cell development.
  • NF-κB activation involves nuclear translocation of specific dimers, influencing gene expression.

Purpose of the Study:

  • To investigate the activation of myocardial NF-κB in response to different exercise intensities.
  • To determine the specific NF-κB subunits involved in the cardiac response to exercise.
  • To explore potential intensity-dependent thresholds for NF-κB subunit activation.

Main Methods:

  • Male Sprague-Dawley rats underwent treadmill running at two distinct intensities (20 m/min for 30 min or 30 m/min for 20 min).
  • Cardiac tissue was collected at 0, 2, and 24 hours post-exercise.
  • Electrophoretic mobility shift assays (EMSA) and supershift analyses were used to assess NF-κB activation and subunit composition.

Main Results:

  • Exercise significantly enhanced NF-κB activation in the myocardium compared to controls.
  • Higher intensity exercise was associated with the p65 (RelA) subunit in the activated NF-κB complex.
  • Lower intensity exercise primarily involved the p50 subunit in the myocardial NF-κB complex.

Conclusions:

  • Exercise demonstrably activates NF-κB in the heart.
  • Specific NF-κB subunits are recruited based on exercise intensity, indicating a threshold effect.
  • These findings contribute to understanding exercise's molecular impact on the myocardium and may inform exercise prescription.