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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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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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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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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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Cardiomyopathy II: Dilated Cardiomyopathy01:30

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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

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The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
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A Doxorubicin-Induced Murine Model of Dilated Cardiomyopathy In Vivo
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Exercise training does not affect anthracycline antitumor efficacy while attenuating cardiac dysfunction.

Traci L Parry1, Reid Hayward2

  • 1School of Sport and Exercise Science, University of Northern Colorado, Greeley, Colorado; and Rocky Mountain Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, Colorado.

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|August 7, 2015
PubMed
Summary
This summary is machine-generated.

Exercise training protects against doxorubicin (DOX) cardiotoxicity without compromising its antitumor efficacy. Endurance exercise reduced DOX accumulation in the heart but not tumors, preserving cardiac function while maintaining chemotherapy effectiveness.

Keywords:
MatBIIIaccumulationcancerdoxorubicinphysical activity

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Area of Science:

  • Cardiovascular Physiology
  • Cancer Therapeutics
  • Exercise Science

Background:

  • Anthracyclines like doxorubicin (DOX) are effective chemotherapy agents but cause significant cardiotoxicity, limiting their clinical use.
  • Exercise is known for its cardioprotective benefits, yet its impact on chemotherapy efficacy remains unclear.

Purpose of the Study:

  • To investigate the combined effects of exercise training and doxorubicin (DOX) treatment on both antitumor efficacy and cardiotoxicity.
  • To determine if exercise influences DOX accumulation and multidrug resistance protein (MRP) expression in cardiac and tumor tissues.

Main Methods:

  • Female Fisher 344 rats were divided into sedentary or wheel-running exercise groups, receiving either saline or doxorubicin (DOX) treatment.
  • Tumor cells were inoculated, and treatment commenced when tumors reached approximately 1 cm in diameter.
  • Tumor growth, cardiac function, DOX accumulation, and MRP expression were assessed at 1, 3, and 5 days post-treatment.

Main Results:

  • Exercise training did not significantly alter doxorubicin (DOX) antitumor efficacy, with similar tumor growth reduction in both sedentary and exercise groups.
  • Exercise preserved cardiac function following DOX treatment and reduced DOX accumulation in ventricular tissue.
  • Exercise upregulated ventricular MPR1 and MPR2 expression, potentially mediating reduced DOX accumulation, while no changes were observed in tumor tissues.

Conclusions:

  • Endurance exercise effectively protects against doxorubicin (DOX)-induced cardiotoxicity without negatively impacting its efficacy against tumors.
  • The cardioprotective effects of exercise may be linked to reduced DOX tissue accumulation in the heart, possibly via regulation of MRP expression.
  • Exercise represents a viable strategy to mitigate chemotherapy-induced cardiac side effects while maintaining therapeutic benefits.