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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...
Exercise and Cardiac Output01:17

Exercise and Cardiac Output

Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be met...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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...
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...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
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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Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine
12:37

Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine

Published on: February 9, 2016

Changes in vascular and cardiac function after prolonged strenuous exercise in humans.

Ellen A Dawson1, Greg P Whyte, Mark A Black

  • 1Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, 15-21 Webster St., Liverpool L3 2ET, UK. e.dawson@ljmu.ac.uk

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 23, 2008
PubMed
Summary

Prolonged strenuous exercise, like a marathon, temporarily impairs leg vascular function and left ventricular diastolic function. It also causes elevations in cardiac troponin I, indicating cardiomyocyte damage in most runners.

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Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy

Published on: February 20, 2018

Area of Science:

  • Exercise Physiology
  • Cardiovascular Physiology
  • Sports Medicine

Background:

  • Prolonged strenuous exercise can acutely depress cardiac function.
  • The impact of such exercise on vascular function remains less understood.
  • Biomarkers of cardiomyocyte damage after endurance events are of clinical interest.

Purpose of the Study:

  • To investigate the effects of a marathon on vascular and cardiac function.
  • To assess the appearance of cardiac troponin I (cTnI) as a biomarker of cardiomyocyte damage.
  • To examine changes in both brachial and femoral artery function.

Main Methods:

  • 15 nonelite male runners completed the London marathon.
  • Vascular function assessed via brachial and femoral artery flow-mediated dilation (FMD) pre- and post-marathon.
  • Cardiac function evaluated using echocardiography (strain, strain rate, velocities).
  • Blood samples analyzed for cardiac troponin I (cTnI) levels.

Main Results:

  • Femoral artery FMD decreased significantly post-marathon (P=0.04), while brachial FMD showed no change (P=0.96).
  • Left ventricular diastolic function, measured by the peak early to atrial radial strain rate ratio, was reduced post-marathon (P=0.006).
  • Elevated cTnI levels were observed in 12 of 13 runners, with 7 exceeding the clinical damage threshold.

Conclusions:

  • A marathon transiently depresses vascular function in the legs.
  • Left ventricular diastolic function is acutely impaired after prolonged intensive exercise.
  • Evidence suggests transient cardiac stress and potential cardiomyocyte damage following marathon running.