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Related Concept Videos

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

Cardiac 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...
Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...

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Simultaneous Electrical and Mechanical Stimulation to Enhance Cells' Cardiomyogenic Potential
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Acute physical activity effects on cardiac gene expression.

Michelle L Simonsen1, Helaine M Alessio, Peter White

  • 1Department of Kinesiology and Health, Miami University, Oxford, OH 45045, USA.

Experimental Physiology
|August 11, 2010
PubMed
Summary

Regular physical activity alters gene expression in rat hearts. Acute exercise impacts gene expression differently in inactive versus active rats, influencing health-related traits.

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Area of Science:

  • Exercise physiology
  • Molecular biology
  • Genomics

Background:

  • Regular physical activity influences gene expression, impacting phenotypes like body weight and tumor development.
  • Acute exercise effects on gene expression and phenotypes vary based on prior activity levels.

Purpose of the Study:

  • To investigate the impact of different housing conditions (sedentary, passive activity, and exercise) on cardiac gene expression in rats.
  • To determine how acute exercise affects gene expression in physically inactive versus active young rats.

Main Methods:

  • Male Sprague-Dawley rats were housed in standard cages (SED), large activity boxes (PA), or cages with exercise wheels (EX) for two months.
  • Cardiac tissue was collected from rats at rest and after 30 minutes of swimming activity for microarray analysis of 27,000 genes.
  • Quantitative PCR was used to validate select gene expression results.

Main Results:

  • No significant gene expression differences were observed among groups at rest.
  • Acute swimming activity induced differential gene expression in 1.9% of genes analyzed (P < 0.05), with 37 genes showing twofold changes.
  • Specific genes (Atf3, Fos, Apold1, Pxdn) showed distinct expression patterns, with SED > PA > EX magnitude following acute activity.

Conclusions:

  • Acute exercise elicits differential cardiac gene expression responses in young rats based on their prior activity levels.
  • These gene expression differences suggest distinct regulatory roles in networks affecting health phenotypes.