Association between initial and final transient heart rate responses in exercise testing
Gisele Messias Mattioli1, Claudio Gil Soares de Araújo
1Universidade Gama Filho, Rio de Janeiro, RJ, Brasil.
Arquivos Brasileiros De Cardiologia
|October 20, 2009
Summary
Standardizing resting heart rate (HR) measurement is crucial for analyzing exercise-induced HR changes. Distinct autonomic mechanisms influence rapid and slow HR responses, offering complementary clinical insights.
Area of Science:
- Cardiovascular Physiology
- Autonomic Nervous System Function
- Exercise Physiology
Background:
- The transition between rest, exercise, and recovery involves complex heart rate (HR) changes modulated by the autonomic nervous system.
- Vagal nerve activity appears to play distinct roles in different phases of these HR transitions.
- Accurate measurement of resting HR is methodologically challenging and critical for interpreting HR dynamics.
Purpose of the Study:
- To investigate the relationship between initial (rapid and slow) and final transient HR responses during exercise.
- To examine how different methods of measuring resting HR affect the analysis of these transient HR responses.
Main Methods:
- Retrospective analysis of 103 non-athlete adults (76 males).
- Utilized a 4-second exercise test to assess rapid transient HR response via cardiac vagal index (CVI).
- Measured HR changes during early exercise (DeltaHR) and recovery (dHR) from a 10-minute maximal cardiopulmonary exercise test.
Main Results:
- Modest correlations (r=0.27-0.31) were observed between CVI and DeltaHR measurements.
- A stronger association (r=0.53) was found between CVI and dHR.
- Significant differences (p<0.05) and moderate correlations (r=0.64-0.76) existed among the three resting HR measurements.
Conclusions:
- Standardization of resting HR measurement is essential for reliable analysis of transient HR responses.
- The observed associations suggest distinct autonomic mechanisms underlie different HR transients.
- Measurements of these transients may offer complementary clinical information regarding autonomic function.
Related Concept Videos
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
01:29Electrocardiogram
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
01:30Factors Influencing Heart Rate
The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
01:19Cardiac 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...
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...
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...