Endurance and strength training in patients with COPD

Area of Science:

• Pulmonary Rehabilitation
• Exercise Physiology
• Chronic Obstructive Pulmonary Disease (COPD) Management

Background:

• Patients with COPD often experience muscle weakness and reduced exercise capacity.
• Pulmonary rehabilitation programs typically include endurance training, but the added benefit of strength training is less understood.

Purpose of the Study:

• To compare the effects of endurance training alone versus combined endurance and strength training in patients with COPD.
• To evaluate the impact of different training modalities on muscle strength, quality of life, exercise performance, and muscle fatigability.

Main Methods:

• A randomized trial involving 24 COPD patients divided into two groups: endurance training only and combined endurance plus strength training.
• Measurements included muscle strength, quality of life (using the Chronic Respiratory Questionnaire), exercise performance (6-minute walk distance, endurance time), and quadriceps fatigability before and after the rehabilitation period.

Main Results:

• Combined training significantly improved muscle strength in quadriceps, hamstrings, pectoralis major, and latissimus dorsi.
• Endurance training alone showed minimal or no significant improvements in muscle strength for most muscle groups.
• Both groups demonstrated significant improvements in 6-minute walk distance, endurance exercise time, and quality of life, with no significant differences between the groups.
• Quadriceps fatigability improvements were similar in both training groups.

Conclusions:

• While strength training enhances muscle strength in COPD patients, it does not provide additional benefits for quality of life, exercise performance, or fatigability compared to endurance training alone.
• Endurance training remains a cornerstone of pulmonary rehabilitation for improving functional capacity and quality of life in COPD.