Interval training compared with continuous training in patients with COPD.

Area of Science:

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

Background:

• Moderate to severe COPD significantly impacts patients' functional capacity, mental health, and quality of life.
• Exercise training is a cornerstone of pulmonary rehabilitation for COPD, but optimal training modalities require further investigation.

Purpose of the Study:

• To compare the efficacy of interval training (IT) versus continuous training (CT) in patients with moderate to severe COPD.
• To assess the impact of IT and CT on peak exercise capacity, physiological responses, functional capacity, dyspnoea, mental health, and health-related quality of life (HRQoL).

Main Methods:

• Sixty patients with moderate or severe COPD were randomized to either interval training (80% W peak) or continuous training (65% W peak) for 16 weeks, twice weekly.
• Assessments included spirometry, cycle ergometry, cardiopulmonary exercise testing, and the 12-minute walk test.
• Dyspnoea, mental health (anxiety and depression), and HRQoL were evaluated using validated questionnaires (CRDQ, HAD, SF-36).

Main Results:

• Both IT and CT significantly improved peak exercise capacity (W peak) and peak oxygen uptake (VO2 peak), with no significant differences between groups.
• Functional capacity, dyspnoea, mental health, and HRQoL showed significant improvements in both training groups, without inter-group differences.
• At identical work rates (isotime), interval training demonstrated a more favorable physiological response, with significantly lower oxygen uptake (VO2), carbon dioxide output (VCO2), and minute ventilation (VE) compared to continuous training.

Conclusions:

• Interval training and continuous training are equally effective in enhancing exercise capacity, functional status, dyspnoea, mental well-being, and HRQoL in COPD patients.
• Interval training may offer advantages in terms of physiological efficiency during exercise at equivalent workloads compared to continuous training.