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Related Concept Videos

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

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

1.4K
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...
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Regulation of Stroke Volume01:27

Regulation of Stroke Volume

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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...
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Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

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Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac...
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Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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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.
Sustained exercise increases the muscles' oxygen demand, which can be...
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Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

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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: Sep 10, 2025

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke
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Poststroke Cardiorespiratory Exercise for Brain Volume and Cognition: A Randomized Clinical Trial.

Amy Brodtmann1,2,3, Leonid Churilov2, Kimberley Adkins1

  • 1Department of Neuroscience, School of Translational Medicine, Monash University, Melbourne, Australia.

JAMA Network Open
|August 26, 2025
PubMed
Summary
This summary is machine-generated.

Cardiorespiratory exercise (CRX) is safe for stroke survivors but did not preserve hippocampal volume. However, CRX may benefit cognitive function after ischemic stroke, suggesting potential for future interventions.

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Area of Science:

  • Neuroscience
  • Cardiovascular Health
  • Clinical Trials

Background:

  • Stroke survivors face increased risk of cognitive impairment and dementia.
  • No proven therapies currently exist for preventing cognitive decline post-stroke.
  • Cardiorespiratory exercise (CRX) is known to preserve brain health.

Purpose of the Study:

  • To investigate if CRX intervention can preserve hippocampal volume (HV) and cognitive function in patients following ischemic stroke.
  • To evaluate the efficacy and safety of a CRX program in stroke survivors.

Main Methods:

  • A phase 2b, assessor-blinded, randomized clinical trial (PISCES-ZODIAC) was conducted.
  • Participants were randomized to either CRX (aerobic and resistance training) or a control group (balance and stretching).
  • Primary outcome was relative change in HV; secondary outcome was executive function (TMT-B) at 12 months.

Main Results:

  • CRX was safe and well-tolerated, with no serious adverse events.
  • No significant difference was observed in hippocampal volume preservation between CRX and control groups.
  • The CRX group showed significant improvement in executive function (TMT-B) compared to the control group at 12 months.

Conclusions:

  • While CRX did not preserve hippocampal volume more than the control intervention, it demonstrated potential benefits for cognitive function.
  • CRX may be a viable strategy for cognitive preservation in individuals post-ischemic stroke.
  • Further research is warranted to optimize CRX protocols for stroke recovery.