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Related Concept Videos

Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac output averages...
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...
Regulation of Stroke Volume01:27

Regulation of Stroke Volume

The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
Heart Failure III: Clinical Manifestations01:26

Heart Failure III: Clinical Manifestations

Heart failure (HF) manifests primarily as dyspnea, fatigue, and fluid retention, resulting in peripheral and pulmonary edema. Symptoms may vary depending on which ventricle is more affected, left or right.Left-Sided Heart FailureAlso known as left ventricular failure, this condition results from the left ventricle's inability to fill or eject sufficient blood into the systemic circulation. It leads to pulmonary congestion, which occurs when the left ventricle fails to eject blood effectively...
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...

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Updated: May 24, 2026

Dual-Task Stroop Paradigm for Detecting Cognitive Deficits in High-Functioning Stroke Patients
07:42

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Published on: December 16, 2022

Discrepancy between cardiac and physical functional reserves in stroke.

Djordje G Jakovljevic1, Sarah A Moore, Lip-Bun Tan

  • 1Newcastle University, Newcastle upon Tyne, NE2 4HH, UK. d.jakovljevic@ncl.ac.uk

Stroke
|February 25, 2012
PubMed
Summary

Exercise capacity after stroke is limited by reduced skeletal muscle oxygen utilization, not cardiac function. Targeted therapies focusing on muscle oxygen uptake may enhance exercise ability in stroke survivors.

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Area of Science:

  • Cardiovascular Physiology
  • Neurology
  • Exercise Science

Background:

  • Stroke survivors often experience reduced exercise capacity, impacting daily function.
  • Understanding the physiological limitations is crucial for developing effective rehabilitation strategies.

Purpose of the Study:

  • To determine if exercise capacity post-stroke is limited by oxygen supply (cardiovascular system) or oxygen utilization (skeletal muscles).
  • To assess cardiac function and pumping capability in individuals with stroke.

Main Methods:

  • Cardiopulmonary exercise testing with gas exchange and hemodynamic measurements were performed on 28 male stroke survivors and 25 age-matched healthy controls.
  • Maximal oxygen extraction was calculated.
  • Cardiac function was evaluated via peak exercise cardiac power output and cardiac output.

Main Results:

  • Stroke participants exhibited significantly lower peak oxygen consumption and arterial-venous oxygen difference compared to controls.
  • Peak exercise cardiac power output, cardiac output, and heart's pressure-generating capacity were similar between groups.
  • Skeletal muscle oxygen extraction was impaired in stroke survivors.

Conclusions:

  • Reduced skeletal muscle oxygen extraction, not impaired cardiac function, limits exercise capacity after stroke.
  • Exercise rehabilitation programs targeting muscle oxygen uptake show promise for improving exercise capacity in stroke survivors.