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Respiratory muscle fatigue and functional capacity in heart failure: a randomized study

Isabella Christina Diniz de Lemos Venâncio, Sergio Luis Soares Marcos da Cunha Chermont, Thais de Rezende Bessa-Guerra, Rafael Menezes da Silva, Maria Clara Murada, Evandro Tinoco Mesquita


Aim: To compare the effect of inspiratory muscle and expiratory muscle fatigue on the functional capacity in outpatients with systolic heart failure. Method: a randomized, crossover study, controlled, double-blind, focusing on outpatients, from June 2014 to December 2015. Individuals will be allocated to a group that will perform 80% inspiratory and expiratory muscle effort (IME and EME) in terms of maximum airway pressure to induce fatigue, or 0% for the placebo (three sets of 10 repetitions). The order in terms of effort and load will be randomized. Before and after the respiratory muscle effort, capillary lactate testing and a six-minute walk test will be performed. Expected results: Specific training for respiratory muscles can improve the functional capacity and the prognosis of these patients with systolic heart failure.


Treinamento Muscular Respiratório; Fadiga; Concentração do Lactato; Dispneia; Características Clínicas; Características Sociodemográficas.


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Online Brazilian Journal of Nursing. ISSN: 1676-4285

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