Aerobic exercise reduces lactate accumulation and improves cardiac function after myocardial infarction

Area of Science:

• Cardiovascular Research
• Metabolic Regulation
• Exercise Physiology

Background:

• Myocardial infarction (MI) often leads to cardiac dysfunction.
• Lactate metabolism plays a role in cardiovascular health.
• The impact of aerobic exercise (AE) on post-MI lactate levels is not fully understood.

Purpose of the Study:

• To investigate lactate's role in post-MI cardiac dysfunction.
• To clarify how AE influences cardiac function by modulating lactate metabolism.
• To provide evidence for clinical interventions targeting lactate metabolism for post-MI recovery.

Main Methods:

• In vitro studies on NIH 3T3 fibroblasts treated with lactate.
• In vivo studies using C57BL/6J mice in myocardial infarction (MI) and aerobic exercise (AE) models.
• Assessment of cardiac function via echocardiography (LVEF, LVFS), lactate assays, and metabolomics.

Main Results:

• Lactate significantly induced fibroblast activation in vitro.
• MI mice showed increased cardiac and serum lactate, decreased LVEF and LVFS.
• AE intervention in MI mice reduced lactate levels and improved cardiac function (LVEF, LVFS) compared to sedentary MI mice.

Conclusions:

• Lactate accumulation is implicated in post-MI cardiac dysfunction.
• Aerobic exercise improves cardiac function after MI by reducing lactate levels.
• Targeting lactate metabolism presents a potential therapeutic strategy for post-MI cardiac rehabilitation.