P. R. Mello et al., “Inspiratory Muscle Training Reduces Sympathetic Nervous Activity and Improves Inspiratory Muscle Weakness and Quality of Life in Patients with Chronic Heart Failure: A Clinical Trial,” Journal of Cardiopulmonary Rehabilitation and Prevention 32, no. 5 (September – October 2012): 255–61, doi: 10.1097/HCR.0b013e31825828da.
