Effect of Ultrabreathe training on pulmonary functions in patients with chronic bronchitis

This randomized study evaluated the effect of ultrabreathe training plus chest physiotherapy, as compared with chest physiotherapy alone, on pulmonary function in 60 male patients aged 50–60 years with moderate chronic bronchitis. As part of the study, lung function (FEV1, FVC, FEV1/FVC ratio) was measured before and after training using the Vitalograph COPD-6 device.