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Related Concept Videos

Factors Influencing Heart Rate01:30

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

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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...
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...

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Related Experiment Video

Updated: Jul 1, 2026

Cognitive Function and Upper Limb Rehabilitation Training Post-Stroke Using a Digital Occupational Training System
07:35

Cognitive Function and Upper Limb Rehabilitation Training Post-Stroke Using a Digital Occupational Training System

Published on: December 29, 2023

Potential Factors Influencing Heart Rates During Locomotor Training Poststroke and Their Associations With Locomotor

Thomas George Hornby1, Christina J Voigtmann, Lindsay Heffron

  • 1Department of Physical Medicine and Rehabilitation, Indiana University School of Medicine, Indianapolis, Indiana (T.G.H., A.P., C.E.H.); Rehabilitation Hospital of Indiana, Indianapolis, Indiana (T.G.H., C.J.V., L.H., E.L., C.E.H.); and Department of Physical Therapy, Brenau University, Gainesville, Georgia (J.K.L.).

Journal of Neurologic Physical Therapy : JNPT
|June 30, 2026
PubMed
Summary

Targeting higher heart rates (HRs) during post-stroke locomotor training did not significantly improve walking outcomes. Ratings of perceived exertion (RPEs) were more consistently related to improvements than achieving specific HR targets, especially for those on beta-blockers.

Keywords:
community mobilitylocomotionphysical activityrehabilitation

Related Experiment Videos

Last Updated: Jul 1, 2026

Cognitive Function and Upper Limb Rehabilitation Training Post-Stroke Using a Digital Occupational Training System
07:35

Cognitive Function and Upper Limb Rehabilitation Training Post-Stroke Using a Digital Occupational Training System

Published on: December 29, 2023

Area of Science:

  • Neurology
  • Rehabilitation Medicine
  • Exercise Physiology

Background:

  • Higher heart rates (HRs) during locomotor training are thought to improve walking speed and distance post-stroke.
  • Individuals with slower walking speeds or on beta-adrenergic antagonists (beta-blockers) may struggle to achieve targeted HRs.

Purpose of the Study:

  • To evaluate how patient-related variables (walking speed, beta-blocker use) affect the ability to achieve targeted HRs during exercise testing and training.
  • To determine the impact of these variables on locomotor outcomes post-stroke.

Main Methods:

  • Secondary analysis of a randomized trial involving 90 individuals post-stroke.
  • Participants were assigned to high-intensity (>70% HR reserve) or low-intensity (<40% HR reserve) training.
  • Examined associations between baseline characteristics, HRs during testing/training, and changes in walking speed/distance.

Main Results:

  • Achieving higher HRs during graded exercise testing correlated with faster peak treadmill speeds but was negatively associated with beta-blocker use.
  • Training HRs were not directly linked to initial locomotor outcomes, and beta-blocker use depressed HRs.
  • Only 40% of participants reached >70% HR reserve during high-intensity training.
  • Training HRs influenced walking outcomes only in non-beta-blocker users; RPEs were consistently correlated with outcomes.

Conclusions:

  • Achieving targeted HR reserve was not the primary driver of improved locomotor outcomes post-stroke.
  • Efforts to increase exercise intensity and the use of RPEs may be beneficial for rehabilitation.
  • Individual patient factors, such as beta-blocker medication, influence HR response during training.