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Updated: Aug 29, 2025

Acute Myocardial Infarction in Rats

Acute Myocardial Infarction in Rats

Published on: February 16, 2011

Swimming training attenuates the decrease of calcium responsiveness in female infarcted rats.

Leslie Andrews Portes¹, Alexandra Alberta Dos Santos², Carlos Roberto Padovani³

¹Professor at UNASP, Researcher at LAFEX, Laboratory of Exercise Physiology, Adventist University of Sao Paulo, Sao Paulo, Brazil.

Frontiers in Physiology

|September 8, 2022

Summary

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This summary is machine-generated.

Swimming exercise improved heart function in rats after myocardial infarction (MI). Exercise training helped restore calcium responsiveness in the myocardium, particularly in rats with larger infarction sizes.

Area of Science:

Cardiology
Exercise Physiology
Cardiac Rehabilitation

Background:

Myocardial infarction (MI) significantly impairs cardiac function.
Reduced myocardial calcium responsiveness is a key consequence of MI.
The potential benefits of exercise training on cardiac recovery after MI require further investigation.

Purpose of the Study:

To investigate the effects of swimming exercise on myocardial calcium responsiveness in rats with varying sizes of MI.
To determine if exercise training can mitigate the negative impacts of MI on cardiac contractility and relaxation.
To assess the relationship between MI size and the efficacy of exercise in improving cardiac function.

Main Methods:

Female Wistar rats underwent surgical procedures to induce moderate or large myocardial infarctions (MI) or sham operations.

Keywords:

calcium responsivity exercise training inoprotpism lusitropism myocardial infarction rats swimming exercise

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Following MI induction, rats were subjected to an 8-week swimming exercise program.

Cardiac function, including inotropism and lusitropism, was assessed using papillary muscle preparations exposed to varying extracellular calcium concentrations.

Main Results:

Myocardial infarction led to significant reductions in both inotropism and lusitropism in sedentary rats.
Swimming exercise training attenuated these functional losses, improving parameters such as +dT/dt, TPT, -dT/dt, and 50%TR.
The beneficial effects of exercise on myocardial responsiveness were observed to be proportional to the size of the MI, indicating a dose-dependent response.

Conclusions:

Swimming exercise favorably impacts myocardial calcium responsiveness in rats following myocardial infarction.
Exercise training offers a protective effect against MI-induced cardiac dysfunction, with benefits more pronounced in larger infarctions.
These findings suggest that exercise interventions may be a valuable strategy for cardiac recovery and rehabilitation after MI.