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September 17, 2026AJP Cell Physiology

Aerobic exercise enhances Ca2+ release and partially reverses early dyadic remodeling in obese female rats.

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Why the study?

Does aerobic exercise improve cardiomyocyte ultrastructure and calcium release in obese female rats?

Population

Female Zucker Diabetic Fatty rats and their lean littermates at 12 weeks of age

Comparison

Aerobic exercise training from 12 to 18 weeks of… vs Sedentary lifestyle

Design

Preclinical

Follow-up

6 weeks (from 12 to 18 weeks of age)

Key result

Aerobic exercise enhanced dyad compactness and Ca2+ release in obese female rats, partially reversing obesity-induced early dyadic remodeling.

Authors

ANAnastasiia NovakIBIuliia BaglaevaRBReyhaneh Nejati Bervanlou

Discussion

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Overview

May inform early exercise interventions in obesity-related cardiac risk; leaves open translation to human cardiomyocyte function and HF prevention.

Key Points

  • To determine how obesity and aerobic exercise influence cardiomyocyte ultrastructure, calcium release, and contractile function in female rats.
  • Female Zucker Diabetic Fatty (ZDF) obese rats and lean littermates were assigned at 12 weeks of age to sedentary or aerobic exercise-trained groups for 6 weeks.
  • Myocardial hypertrophy, cardiomyocyte ultrastructure (including dyadic compactness), contractility, and stimulated and caffeine-induced Ca²⁺ release were assessed at 18 weeks using Type III ANOVA.
  • Sedentary obese rats developed myocardial hypertrophy without diabetes, exhibiting reduced compact dyad fractions and diminished stimulated and caffeine-induced Ca²⁺ release, while contractility remained intact.
  • Aerobic exercise in obese rats enhanced both dyad compactness and Ca²⁺ release, confirming a significant obesity × exercise interaction for dyadic architecture and calcium handling.

Structured PICO

Does aerobic exercise improve cardiomyocyte ultrastructure and calcium release in obese female rats?

P
Population
Female Zucker Diabetic Fatty rats and lean littermates assigned at 12 weeks of age to sedentary or aerobic exercise-trained groups for 6 weeks.
I
Intervention
Aerobic exercise training from 12 to 18 weeks of age
C
Comparator
Sedentary lifestyle (maintained on a standard diet)
O
Outcome
Cardiomyocyte ultrastructure, Ca²⁺ release, and contractilitysurrogate

Aerobic exercise partially reverses early obesity-induced dyadic remodeling and altered calcium handling in female rat cardiomyocytes before global structural or contractile impairment occurs.

Cite This Study

Novak et al. (2026) studied Obesity. Aerobic exercise vs. Sedentary was evaluated on Cardiomyocyte ultrastructure, Ca2+ release, and contractility. Aerobic exercise enhanced dyad compactness and Ca2+ release in obese female rats, partially reversing obesity-induced early dyadic remodeling.

synapsesocial.com/papers/6aabb8045f706d05830e7748https://doi.org/10.1152/ajpcell.00379.2026
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