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Related Concept Videos

Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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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...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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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...
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Cardiac Cycle01:29

Cardiac Cycle

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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
During the cardiac cycle, blood flow through the heart is regulated entirely by changing pressure gradients. This sequence of events begins with the heart in a state of total relaxation, known as mid-to-late diastole, during which blood passively flows from...
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Exercise Stress Test01:26

Exercise Stress Test

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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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Carotid-Ventricular Coupling During Exercise: A Pilot Study.

Elisabetta Bianchini1, Rosa Maria Bruno2, Annalisa Pitino3

  • 1Institute of Clinical Physiology, National Research Council, Pisa, Italy betta@ifc.cnr.it.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|June 30, 2016
PubMed
Summary
This summary is machine-generated.

Older patients with coronary artery disease show abnormal carotid-ventricular adaptation during exercise, unlike healthy young individuals. This highlights impaired vascular and cardiac function in this patient group.

Keywords:
arterial stiffnessarterial-ventricular couplingcarotid arterycarotid elasticityexercisevascular ultrasound

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Area of Science:

  • Cardiovascular Physiology
  • Vascular Biology
  • Exercise Cardiology

Background:

  • Aging and coronary artery disease (CAD) are associated with altered cardiovascular mechanics.
  • Understanding the dynamic adaptation of vascular and ventricular function during stress is crucial for risk stratification.

Purpose of the Study:

  • To assess carotid elasticity and left ventricular elastance during graded exercise in patients with CAD.
  • To compare these parameters with those of healthy young volunteers.

Main Methods:

  • Utilized B-mode sonography for carotid diameter, radial artery tonometry for pressure, and echocardiography for cardiac volumes.
  • Calculated carotid distensibility coefficient and left ventricular elastance index.
  • Measurements were taken at rest, peak exercise, and recovery.

Main Results:

  • Elderly patients with CAD exhibited lower carotid distensibility and higher left ventricular elastance compared to controls.
  • Carotid diameter increased with exercise only in healthy volunteers.
  • Carotid distensibility decreased and left ventricular elastance increased during exercise in controls, with less pronounced changes in patients.

Conclusions:

  • Older patients with CAD or risk factors demonstrate abnormal carotid-ventricular coupling during exercise.
  • This suggests impaired adaptive responses in vascular and cardiac function under stress in this population.