Tests run on patients with cardiac insufficiency (Fritzsche, van Buuren; North Rhine-Westphalia Heart Centre, Bad Oeynhausen, 2010 and 2012) produced interesting results in that lung function often improved in the patients. This was due to the significant improvement in expiratory capacity, which was caused by the training of the respiratory muscles, especially the intercostal muscles. Patients were better able to expel air which is a decisive improvement for those suffering from obstructive pulmonary conditions.