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Related Concept Videos

Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

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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.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
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Regulation of Heart Rates01:31

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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
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Correlation between ECG and Cardiac Cycle01:25

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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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Pulse rhythm01:30

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Electrocardiogram01:29

Electrocardiogram

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

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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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Related Experiment Video

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Real-Time Electrocardiogram Monitoring During Treadmill Training in Mice
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Heart rate regulation during cycle-ergometer exercise via event-driven biofeedback.

Ahmadreza Argha1, Steven W Su2, Branko G Celler3

  • 1Faculty of Engineering and Information Technology, University of Technology, Sydney, Broadway, PO Box 123, Sydney, NSW, 2007, Australia. Ahmadreza.Argha@student.uts.edu.au.

Medical & Biological Engineering & Computing
|June 5, 2016
PubMed
Summary

This study introduces a novel actuator-based event-driven control system for regulating heart rate during cycle-ergometer exercise. The synchronized biofeedback mechanism significantly improves exercise intensity control compared to conventional methods.

Keywords:
Actuator-based event-driven PID controlCycle-ergometer exercisingHeart rate regulation

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Area of Science:

  • Biomedical Engineering
  • Exercise Physiology
  • Control Systems

Background:

  • Regulating heart rate during cycle-ergometer exercise is crucial for training and rehabilitation.
  • Conventional proportional, integral, and derivative (PID) controllers with fixed-rate biofeedback can be ineffective due to timing issues with pedal position.

Purpose of the Study:

  • To develop and evaluate a novel actuator-based event-driven control system for precise heart rate regulation.
  • To compare the performance of a synchronized biofeedback mechanism against a fixed-rate biofeedback mechanism.

Main Methods:

  • A non-conventional, non-model-based PID controller was designed.
  • An actuator-based event-driven control system with synchronized biofeedback was implemented.
  • Experimental verification involved 24 healthy male subjects in two groups with cross-validation.

Main Results:

  • The proposed PID controller with synchronized biofeedback demonstrated superior performance.
  • Tracking error was significantly lower compared to conventional fixed-rate biofeedback (e.g., 3.9 vs. 5.0 bpm).
  • Statistical analysis confirmed no significant differences in PID tune generalization between groups.

Conclusions:

  • The novel actuator-based event-driven control system effectively regulates heart rate during cycle-ergometer exercise.
  • Synchronized biofeedback enhances user engagement and control accuracy.
  • This system offers improved cardio-respiratory training and rehabilitation outcomes.