Interval training compared with continuous training in patients with COPD

SummaryThe aim of this study was to compare the effects of interval training (3-min intervals) with continuous training on peak exercise capacity (W peak), physiological response, functional capacity, dyspnoea, mental health and health-related quality of life (HRQoL) in patients with moderate or severe COPD.Sixty patients exercised twice weekly for 16 weeks after randomisation to interval- or continuous training. Target intensity was ⩾80% of baseline W peak in the interval group (I-group) and ⩾65% in the continuous group (C-group). Patients were tested by spirometry, ergometer cycle test, cardiopulmonary test and a 12min walk test. Dyspnoea was measured by the dyspnoea scale from Chronic Obstructive Disease Questionnaire (CRDQ), mental health by Hospital Anxiety and Depression scale (HAD) and HRQoL by the Medical Outcomes Survey Short Form 36 (SF-36).After training, W peak, peak oxygen uptake (VO2 peak) and exhaled carbon dioxide (VCO2 peak) increased significantly in both groups, no significant differences between the groups. Minute ventilation (VE peak) increased only in the C-group. At identical work rates (isotime) VO2, VCO2 and VE were significantly more decreased in the I-group than in the C-group (p