Intermittent Fasting Attenuates Exercise Training-Induced Cardiac Remodeling.

Area of Science:

• Cardiovascular Physiology
• Metabolic Health
• Exercise Science

Background:

• Non-pharmacological interventions like calorie restriction and exercise training are studied for cardiovascular disease prevention.
• Understanding the combined effects of diet and exercise on cardiac health is crucial.

Purpose of the Study:

• To investigate the impact of intermittent fasting (IF) and exercise training (ET) on functional fitness, glycemia, and cardiac remodeling.
• To assess the synergistic effects of IF and ET on cardiovascular parameters in a rat model.

Main Methods:

• Wistar rats were divided into control, ET, IF, and ET plus IF (ETI) groups for 12 weeks.
• Animals underwent treadmill exercise and controlled feeding schedules (daily or every-other-day).
• Evaluated functional fitness, blood glucose, cardiac morphology, and specific protein expressions (ERK, JNK).

Main Results:

• Exercise training (ET and ETI) enhanced functional fitness and induced cardiac fibrosis.
• The combined ETI approach significantly reduced blood glucose levels, cardiomyocyte size, and collagen fraction compared to ET alone.
• No significant differences in ERK and JNK expression were observed among groups.

Conclusions:

• Intermittent fasting combined with exercise training demonstrates improved glucose tolerance.
• This combined intervention attenuates exercise-induced cardiac remodeling, suggesting a protective effect on the heart.