Key result
Moderate endurance exercise induced left ventricular dilatation and prolonged action potential duration in female mice, while increasing ventricular tachycardia incidence in both sexes compared to sedentary controls.
Why the study?
While moderate endurance exercise improves cardiovascular health, its effects on cardiac structure and function are not fully characterized, particularly regarding sexual dimorphism.
Does moderate endurance exercise alter cardiac structure, function, and arrhythmia susceptibility in a sex-dependent manner in wild-type mice?
Population
C57BL/6J mice of both sexes
Comparison
Moderate endurance exercise in male versus female mice
Design
Preclinical animal study
Follow-up
Six weeks
Authors
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May caution against uniform exercise benefits in arrhythmia models; leaves open translation to human sex-specific remodeling.
RCT (n=40)
Randomly assigned
No
Does moderate endurance exercise alter cardiac structure, function, and arrhythmia susceptibility in a sex-dependent manner in wild-type mice?
Moderate endurance exercise induces sexually dimorphic cardiac remodeling in mice, improving mechanical function but potentially increasing pro-arrhythmic susceptibility, particularly in females.
George et al. (2023) conducted an RCT in Healthy (n=40). Moderate endurance exercise vs. Sedentary control was evaluated. Moderate endurance exercise induced left ventricular dilatation and prolonged action potential duration in female mice, while increasing ventricular tachycardia incidence in both sexes compared to sedentary controls.
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