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Nonselective beta-receptor blocker effect on high density lipoprotein cholesterol after chronic exercise
Journal of the American College of Cardiology
|September 1, 1988
Summary
Aerobic exercise increased high-density lipoprotein (HDL) cholesterol in men with coronary heart disease, especially those with initially low HDL levels. Beta-blocker use did not prevent this beneficial exercise effect in high-risk patients.
Area of Science:
- Cardiology
- Exercise Physiology
- Lipid Metabolism
Background:
- Coronary heart disease (CHD) poses a significant health burden.
- High-density lipoprotein (HDL) cholesterol plays a crucial role in cardiovascular health.
- The impact of aerobic exercise on HDL cholesterol in patients with CHD, particularly those on beta-blockers, requires further elucidation.
Purpose of the Study:
- To investigate the effects of a 12-week monitored aerobic exercise program on HDL cholesterol levels in men with CHD.
- To compare HDL cholesterol changes between patients taking nonselective beta-receptor blocking drugs and those not on these medications.
- To determine if baseline HDL cholesterol levels influence the exercise-induced changes in HDL and LDL/HDL ratio.
Main Methods:
- Forty-five men with CHD participated in a 12-week monitored aerobic exercise program.
- Participants were divided into two groups: Group 1 (taking beta-blockers) and Group 2 (not taking beta-blockers for ≥3 months).
- HDL cholesterol and LDL/HDL ratio were measured before and after the exercise intervention, with subgroup analysis based on initial HDL levels (<35 mg/dl vs. >35 mg/dl).
Main Results:
- Patients not on beta-blockers (Group 2) showed a significant increase in HDL cholesterol (8.4 ± 5.5 mg/dl; p < 0.05).
- Patients with initial HDL < 35 mg/dl in both groups experienced significant HDL increases (p < 0.02 for Group 1, p < 0.001 for Group 2) and LDL/HDL ratio decreases.
- Patients with initial HDL > 35 mg/dl did not show significant HDL changes post-exercise.
Conclusions:
- Aerobic exercise can significantly increase HDL cholesterol and improve the LDL/HDL ratio in high-risk patients with initially low HDL levels, irrespective of beta-blocker use.
- Exercise training is a viable strategy to augment HDL cholesterol in patients with CHD, even those on beta-blocking medication.
- The beneficial effects of exercise on lipid profiles appear more pronounced in individuals with lower baseline HDL cholesterol levels.