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Cardiac Response to β-Adrenergic Stimulation Determined by Pressure-Volume Loop Analysis

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Published on: May 19, 2021

Cardiac β-adrenergic responsiveness with exercise.

Joseph R Libonati¹, Scott M MacDonnell

¹Biobehavioral and Health Sciences, University of Pennsylvania, School of Nursing, 135 Claire M. Fagin Hall, 418 Curie Boulevard, Philadelphia, PA 19104-4217, USA. jlibonat@nursing.upenn.edu

European Journal of Applied Physiology

|March 16, 2011

Summary

This summary is machine-generated.

Chronic exercise training enhances cardiac beta-adrenergic responsiveness (BAR) in rats. This improvement in heart function occurred without changes in cardiac hypertrophy markers after 12 weeks of treadmill running.

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Area of Science:

Cardiovascular Physiology
Exercise Science
Molecular Cardiology

Background:

Chronic exercise training improves left ventricular performance.
Cardiomyocyte beta-adrenergic responsiveness (BAR) may mediate exercise-induced cardiac benefits.
Understanding molecular adaptations to exercise is crucial for cardiovascular health.

Purpose of the Study:

To investigate the effects of 3 months of treadmill training on cardiac BAR in Wistar Kyoto rats.
To examine changes in key cardiac hypertrophic signaling molecules following exercise.
To determine if exercise-induced improvements in BAR are linked to cardiac hypertrophy.

Main Methods:

Four-month-old female Wistar Kyoto rats were divided into sedentary and exercise-trained groups.
Exercise training involved 12 weeks of treadmill running (60 min/day, 5 days/week).
Cardiac BAR was assessed in vitro using Langendorff-perfused hearts with incremental isoproterenol infusion; gene expression (calcineurin A, ANP, AKT) was measured via RT-PCR.

Main Results:

No significant differences in heart weight, heart-to-body weight ratio, or mRNA expression of calcineurin A, ANP, and AKT were observed between groups.
The exercise-trained group exhibited significantly enhanced cardiac BAR compared to the sedentary group at a high concentration of isoproterenol (1 x 10(-7) mol/L).
Improved cardiac BAR was observed independently of changes in cardiac hypertrophy or related molecular markers.

Conclusions:

Moderate-intensity treadmill exercise enhances cardiac beta-adrenergic responsiveness in female Wistar Kyoto rats.
This adaptation in BAR occurs without significant alterations in cardiac hypertrophy or the expression of selected hypertrophic signaling molecules.
Exercise training confers cardiovascular benefits through mechanisms that may involve improved beta-adrenergic signaling pathways.