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Related Concept Videos

Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
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Magnetic Adjustment of Afterload in Engineered Heart Tissues
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Published on: May 5, 2020

Mechanisms underpinning exercise-induced changes in left ventricular function.

Jessica M Scott1, Darren E R Warburton

  • 1Cardiovascular Physiology and Rehabilitation Laboratory, University of British Columbia, Vancouver, British Columbia, Canada. jmscott@interchange.ubc.ca

Medicine and Science in Sports and Exercise
|July 11, 2008
PubMed
Summary
This summary is machine-generated.

Prolonged strenuous exercise can temporarily decrease heart performance. This review explores potential causes of exercise-induced cardiac fatigue, focusing on systolic and diastolic function changes.

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Area of Science:

  • Exercise physiology
  • Cardiovascular research
  • Sports medicine

Background:

  • Prolonged strenuous exercise (PSE) is linked to temporary reductions in right ventricular (RV) and left ventricular (LV) performance.
  • The precise mechanisms underlying this exercise-induced cardiac fatigue remain incompletely understood.

Purpose of the Study:

  • To critically review existing animal and human literature.
  • To elucidate potential mechanisms responsible for exercise-induced cardiac fatigue.
  • To provide insight into transient changes in RV and LV function post-PSE.

Main Methods:

  • Comprehensive literature review of animal and human studies.
  • Analysis of proposed mechanisms affecting systolic function.
  • Examination of proposed mechanisms affecting diastolic function.

Main Results:

  • Key mechanisms contributing to transient systolic dysfunction include altered loading conditions, myocardial ischemia/damage, altered beta-receptor responsiveness, and cardiac autonomic modulation.
  • Potential mechanisms for transient diastolic dysfunction involve changes in LV pressure gradients and intrinsic myocardial relaxation.
  • Several mechanisms are supported as partially contributing to post-PSE myocardial performance changes.

Conclusions:

  • While further research is needed, altered loading, ischemia, receptor function, autonomic control, and relaxation dynamics are implicated in exercise-induced cardiac fatigue.
  • Understanding these mechanisms is crucial for managing and mitigating the effects of prolonged strenuous exercise on cardiac function.
  • This review synthesizes current knowledge on the complex interplay of factors leading to transient cardiac fatigue after intense physical exertion.