Corrigenda

Abstract

We regret that in our CrossTalk article (Patel et al. 2012) we made an incorrect reference to a study. The correct references refer to work carried out within the same group and the substance of our argument remains unchanged. The paragraph in question (p. 3393, bottom of third column) should read: Another objection to RMT in disease is that changes in respiratory muscle function and performance correlate poorly. Importantly, Ramírez-Sarmiento et al. found that despite architectural adaptation of the intercostal inspiratory muscles, there was no improvement in 6MWD following RMT (Ramírez-Sarmiento et al. 2002). In another study, RMT increased inspiratory muscle endurance in COPD patients, without improving any functional performance measure (McKeon et al. 1986). Similarly, when investigating expiratory muscle training in COPD (Mota et al. 2007), 6MWD improved substantially even though classical airway physiology dictates that, in COPD, increasing expiratory force cannot increase expiratory flow. The incorrect reference is Orozco-Levi et al. (1999). The correct references are Mota et al. (2007) and Ramírez-Sarmiento et al. (2002).