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Moderate-Intensity and High-Intensity Interval Exercise Training Offer Equal Cardioprotection, with Different

Sarah D'Haese1,2, Lisa Claes1, Iris de Laat1

  • 1UHasselt, Cardio & Organ Systems (COST), Biomedical Research Institute, Agoralaan, 3590 Diepenbeek, Belgium.

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Moderate-intensity exercise training (MIT) and high-intensity interval training (HIIT) both prevent type 2 diabetes mellitus (T2DM) cardiac issues in rats. These exercise types may use different adaptive mechanisms to protect the heart.

Keywords:
cardioprotectiondiabetic cardiomyopathyexercise trainingtype 2 diabeteswestern diet

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Science
  • Metabolic Disease Research

Background:

  • Type 2 diabetes mellitus (T2DM) is linked to adverse cardiac remodeling and dysfunction.
  • The optimal intensity of endurance exercise for cardioprotection in T2DM remains unclear.
  • Western diet (WD) feeding in rats can induce T2DM and cardiac pathology.

Purpose of the Study:

  • To investigate the effects of isocaloric moderate-intensity exercise training (MIT) and high-intensity interval exercise training (HIIT) on cardiac remodeling and dysfunction in a rat model of T2DM.
  • To explore the underlying molecular mechanisms by which MIT and HIIT exert cardioprotective effects.

Main Methods:

  • Male rats were fed a WD to induce T2DM and then assigned to sedentary, MIT, or HIIT groups.
  • Cardiac function was assessed using echocardiography and invasive hemodynamics.
  • Gene expression (qPCR) and histology of left ventricular (LV) tissue were analyzed to understand cellular mechanisms.

Main Results:

  • Both MIT and HIIT halted T2DM development and prevented pathological LV hypertrophy and diastolic dysfunction compared to sedentary rats.
  • HIIT upregulated oxidative stress-related genes (NOX4) and antioxidant defenses (SOD2, glyoxalase 1).
  • Both interventions increased pro-inflammatory markers, while MIT also promoted anti-inflammatory macrophage markers.

Conclusions:

  • Both MIT and HIIT are effective in preventing cardiac complications associated with T2DM induced by WD in rats.
  • MIT and HIIT appear to employ distinct adaptive mechanisms, involving differential modulation of inflammatory and oxidative stress pathways.
  • Further research is warranted to elucidate the specific roles of these pathways in exercise-mediated cardioprotection.