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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...
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...
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 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...

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Related Experiment Video

Updated: Jun 13, 2026

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans
08:29

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans

Published on: December 18, 2016

Cardiac output as a potential risk factor for abnormal brain aging.

Angela L Jefferson1

  • 1Department of Neurology, Alzheimer's Disease Center, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA 02118, USA. angelaj@bu.edu

Journal of Alzheimer'S Disease : JAD
|April 24, 2010
PubMed
Summary

Even mild cardiac dysfunction, indicated by low cardiac output, may accelerate brain aging and increase Alzheimer's disease risk. This suggests a direct link between heart health and brain health in aging adults.

Related Experiment Videos

Last Updated: Jun 13, 2026

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans
08:29

Symmetric Bihemispheric Postmortem Brain Cutting to Study Healthy and Pathological Brain Conditions in Humans

Published on: December 18, 2016

Area of Science:

  • Cardiovascular Science
  • Neuroscience
  • Gerontology

Background:

  • Heart failure is a known model for brain changes in aging.
  • Systemic hypoperfusion from cardiac dysfunction theoretically impacts cerebral perfusion and brain injury.
  • Recent data explore links between subtle cardiac issues and brain aging markers.

Purpose of the Study:

  • To review recent data on the association between cardiac function and brain aging.
  • To explore the hypothesis that reduced cardiac output is a risk factor for abnormal brain aging and Alzheimer's disease.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of data quantifying cardiac output and cognitive/neuroimaging markers.
  • Theoretical modeling of mechanistic pathways.

Main Results:

  • Subtle cardiac dysfunction, or low-normal cardiac output, correlates with cognitive and neuroimaging markers of abnormal brain aging.
  • These associations exist even without overt heart failure or severe cardiomyopathy.
  • Reduced cardiac output may independently contribute to brain injury.

Conclusions:

  • Reduced cardiac output may be a risk factor for Alzheimer's disease and abnormal brain aging.
  • Mechanisms may include neurovascular processes, microembolism, and Alzheimer's neuropathology.
  • A direct pathway from cardiac output to brain aging, independent of shared risk factors, is proposed.