Acute changes in high-density lipoprotein cholesterol with exercise of different intensities

Area of Science:

• Exercise Physiology
• Cardiovascular Health
• Lipid Metabolism

Background:

• High-density lipoprotein cholesterol (HDL-C) plays a crucial role in reverse cholesterol transport.
• Understanding the acute effects of exercise on HDL-C is vital for cardiovascular disease prevention.
• Exercise intensity is a key variable that may modulate the exercise-induced HDL-C response.

Purpose of the Study:

• To investigate the acute effects of exercise on plasma HDL-C.
• To determine if exercise intensity influences the magnitude of HDL-C response.
• To examine changes in other plasma lipids and metabolites during exercise.

Main Methods:

• Twelve healthy men performed treadmill running at two intensities: 60% and 90% of maximal oxygen uptake (VO2max).
• Equivalent distances (9-12 km) were covered in each condition.
• Plasma levels of total cholesterol, triglycerides (TG), HDL-C, HDL apoprotein A (HDL-A), HDL saturation, lactate (LA), and free fatty acids (FFA) were measured and corrected for plasma volume changes.

Main Results:

• Significant increases in HDL-C, HDL-A, and HDL saturation were observed at both exercise intensities (P < 0.01).
• Higher intensity exercise (90% VO2max) resulted in greater increases in HDL-C (25% vs. 14%) and HDL-A (18% vs. 8%) compared to moderate intensity (60% VO2max).
• Lactate concentrations significantly increased during high-intensity exercise, while plasma FFA and TG levels did not differ between conditions.

Conclusions:

• Acute exercise, even at moderate intensity, can increase HDL components.
• The magnitude of exercise-induced increases in HDL-C and HDL-A is directly related to exercise intensity.
• These findings highlight the importance of exercise intensity in modulating HDL-C responses for potential cardiovascular benefits.