Related Experiment Video
Updated: Jul 5, 2026
09:18
Doppler Ultrasound-Based Leg Blood Flow Assessment During Single-Leg Knee-Extensor Exercise in an Uncontrolled Setting
Published on: December 15, 2023
Defining exercise synchrony in fit young adults: a tissue Doppler study
John Silberbauer1, Rick A Veasey, Paul Mullan
1Department of Cardiology, Eastbourne District General Hospital, Eastbourne, United Kingdom. johnsilberbauer@lycos.com
Summary
Assessing left ventricular synchrony during exercise is feasible in healthy individuals. Maximal exercise does not significantly alter cardiac contraction synchrony in this population.
Area of Science:
- Cardiology
- Exercise Physiology
- Cardiac Mechanics
Background:
- Left ventricular (LV) contraction synchrony is a potential therapeutic target in heart failure.
- Limited data exist on the feasibility of exercise assessments for LV synchrony.
- The impact of exercise on cardiac synchrony in healthy individuals remains unclear.
Purpose of the Study:
- To evaluate the feasibility of assessing left ventricular synchrony during maximal cardiopulmonary exercise.
- To determine the effect of maximal exercise on left ventricular synchrony in healthy young men.
Main Methods:
- Tissue Doppler imaging was used to assess LV synchrony in 11 healthy young men.
- Assessments were performed before and immediately after maximal cardiopulmonary exercise.
- Maximal dispersion times for onset and peak systolic velocities were calculated as synchrony indices.
Main Results:
- The proportion of the cardiac cycle for systolic motion onset and peak was consistent at rest and peak exercise.
- No significant exercise-induced changes in interventricular or intraventricular synchrony were observed.
- Exercise synchrony assessment was technically feasible.
Conclusions:
- Assessing left ventricular synchrony during maximal exercise is technically feasible.
- Cardiac contraction synchrony is maintained following maximal exercise in healthy individuals.
- These findings establish a baseline for future studies in patient populations.
Related Concept Videos
01:19Assessing Blood pressure using a doppler ultrasound
To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
01:26Exercise 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
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
01:20Exercise 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...
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...
01:25Correlation between ECG and Cardiac Cycle
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...
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...
01:17Exercise 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...
Sustained exercise increases the muscles' oxygen demand, which can be met...
01:17Imaging Studies for Cardiovascular System I:Echocardiography
Cardiac imaging studies encompass a wide range of noninvasive and minimally invasive techniques designed to visualize the heart's structure and function in detail. One such technique is echocardiography, which uses high-frequency ultrasound waves to produce detailed images of the heart, known as echocardiograms.
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion, evaluates...
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion, evaluates...