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Related Concept Videos

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.
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Exercise and Cardiovascular Response01:20

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
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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.
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Exercise and Cardiac Output01:17

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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.
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

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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.
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Exercise Stress Test01:26

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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.
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Autonomic Function Following Concussion in Youth Athletes: An Exploration of Heart Rate Variability Using 24-hour Recording Methodology
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The Relationship between Postexercise Hypotension and Heart Rate Variability before and after Exercise Training.

Burak T Cilhoroz1, Amanda Zaleski2,3, Beth Taylor2

  • 1Department of Exercise Science, Falk College of Sports and Human Dynamics, Syracuse University, Syracuse, NY 13244, USA.

Journal of Cardiovascular Development and Disease
|February 24, 2023
PubMed
Summary
This summary is machine-generated.

Individuals with hypertension and reduced heart rate variability (HRV) experience greater postexercise hypotension (PEH). Resting HRV may predict PEH response, regardless of aerobic training status.

Keywords:
autonomic activityblood pressuregraded exercise stress testhypertension

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Science
  • Hypertension Research

Background:

  • Postexercise hypotension (PEH) is a phenomenon where blood pressure remains lower after exercise.
  • Heart rate variability (HRV) reflects autonomic nervous system activity and is often altered in hypertension.
  • Data linking PEH and HRV in hypertensive adults undergoing aerobic training are limited.

Purpose of the Study:

  • To investigate the relationship between heart rate variability (HRV) and postexercise hypotension (PEH).
  • To examine how aerobic exercise training influences PEH and HRV in adults with hypertension.
  • To identify predictors of PEH response in this population.

Main Methods:

  • Eighteen middle-aged adults with hypertension and obesity participated in a 12-week aerobic training program.
  • Ambulatory blood pressure monitoring and 5-minute resting electrocardiogram (ECG) for HRV assessment were conducted before and after training.
  • Participants underwent graded exercise stress tests (GEST) and non-exercise control (CONTROL) conditions.

Main Results:

  • Before training, HRV parameters (high frequency, low/high frequency ratio) and resting blood pressure predicted systolic and diastolic blood pressure responses.
  • After training, HRV parameters (standard deviation of NN intervals) and resting blood pressure were significant predictors of blood pressure reduction.
  • Individuals with lower HRV (parasympathetic suppression) exhibited a greater PEH response, independent of training status.

Conclusions:

  • Resting heart rate variability (HRV) appears to be a significant determinant of postexercise hypotension (PEH) in adults with hypertension.
  • Parasympathetic activity, indicated by HRV, may influence the magnitude of blood pressure reduction following exercise.
  • These findings suggest that HRV could serve as a potential biomarker for predicting PEH response in hypertensive individuals.