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Related Concept Videos

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 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...
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...
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...
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...

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Related Experiment Video

Updated: Jun 25, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
07:09

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Published on: February 20, 2017

Do healthy individuals develop intraventricular gradients during exertion?

Carlos Cotrim1, Ana G Almeida, Manuel Carrageta

  • 1Serviço de Cardiologia, do Hospital Garcia de Orta, Almada, Portugal. carlosadcotrim@hotmail.com

Revista Portuguesa De Cardiologia : Orgao Oficial Da Sociedade Portuguesa De Cardiologia = Portuguese Journal of Cardiology : an Official Journal of the Portuguese Society of Cardiology
|February 21, 2009
PubMed
Summary

This study found that healthy individuals do not develop intraventricular gradients or systolic anterior motion (SAM) of the mitral valve during exertion. Exercise echocardiography in 34 healthy adults showed no obstructive gradients or SAM during treadmill testing.

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Published on: January 20, 2023

Area of Science:

  • Cardiology
  • Physiology

Background:

  • Intraventricular gradients during exertion have been observed in various clinical settings.
  • Previous studies using exercise echocardiography in healthy subjects failed to demonstrate these gradients immediately post-exercise.

Purpose of the Study:

  • To evaluate the development of obstructive intraventricular gradients and systolic anterior motion (SAM) of the mitral valve during exertion in healthy individuals.
  • To assess left ventricular outflow tract (LVOT) velocity changes during exercise treadmill testing.

Main Methods:

  • Exercise echocardiography using Doppler was performed on 34 healthy individuals (mean age 50 ± 12 years) during treadmill testing (Bruce protocol).
  • Measurements included maximum LVOT velocity in different positions (left lateral decubitus, orthostatic) and at various exercise stages (rest, 3 minutes, peak exercise).

Main Results:

  • Maximum LVOT velocity increased significantly from rest (111 cm/sec) to 3 minutes (163 cm/sec) and peak exercise (237 cm/sec).
  • No participants developed obstructive intraventricular gradients or SAM of the mitral valve during exertion.

Conclusions:

  • Healthy individuals in this study did not exhibit left intraventricular gradients or SAM during exertion.
  • The findings suggest that these phenomena are not typical in a healthy population under exercise stress.