Marathon runners presented lower serum cholesteryl ester transfer activity than sedentary subjects

Area of Science:

• Cardiovascular Health
• Lipid Metabolism
• Exercise Physiology

Background:

• Acute exercise transiently increases high-density lipoprotein (HDL) cholesterol via lipolysis.
• This acute effect is insufficient to explain sustained HDL increases from regular exercise.
• Understanding mechanisms behind long-term exercise-induced HDL changes is crucial for cardiovascular health.

Purpose of the Study:

• To investigate the relationship between regular aerobic exercise, cholesteryl ester transfer activity (CETA), and HDL cholesterol levels in marathon runners.
• To explore how training modifies lipoprotein metabolism beyond lipolysis.

Main Methods:

• Measured lipid transfer protein I (LTP-I)-mediated cholesteryl ester transfer activity (CETA) in marathon runners during training.
• Compared CETA and various lipoprotein concentrations (HDL, triglyceride, VLDL cholesterol, apolipoproteins A-I and B) between runners and sedentary controls.

Main Results:

• Runners exhibited significantly lower CETA compared to sedentary controls.
• Male runners showed lower triglyceride, VLDL cholesterol, and apolipoprotein B levels.
• Male runners also displayed higher HDL cholesterol and apolipoprotein A-I concentrations.

Conclusions:

• Regular aerobic exercise induces significant modifications in lipoprotein metabolism, including reduced CETA.
• These adaptations contribute to favorable lipid profiles beyond lipolysis.
• The observed changes suggest a reduced risk of atherosclerosis associated with consistent aerobic training.