High-Intensity Inspiratory Protocol Increases Heart Rate Variability in Myocardial Revascularization Patients

Autor(es)

Flavia Cristina Rossi Caruso ^[1] ; Rodrigo Polaquini Simões ^[2] ; Michel Silva Reis ^[3] ; Solange Guizilini ^[4] ; Vera Lucia dos Santos Alves ^[5] ; Valeria Papa ^[6] ; Ross Arena ^[7] ; Audrey Borghi-Silva ^[8]

Afiliação do(s) autor(es)

^[1] Federal University of São Carlos. Laboratory of Cardiopulmonary Physiotherapy - Brasil

^[2] Federal University of São Carlos. Laboratory of Cardiopulmonary Physiotherapy - Brasil

^[3] Federal University of Rio de Janeiro. Faculty of Medicine. Department of Physiotherapy - Brasil

^[4] Federal University of São Paulo. Department of Sciences of Human Movement - Brasil

^[5] Faculty of Medical Sciences at Santa Casa de São Paulo - Brasil

^[6] Hospital São Francisco of Ribeirão Preto - Brasil

^[7] University of Illinois Chicago. College of Applied Health Sciences. Department of Physical Therapy and Integrative Physiology Laboratory - Estados Unidos

^[8] Federal University of São Carlos. Laboratory of Cardiopulmonary Physiotherapy - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Revista Brasileira de Cirurgia Cardiovascular; v. 31, n. 1, p. 38-44, 2016-02-00.

Resumo

Abstract Objective: To evaluate heart rate variability during an inspiratory muscle endurance protocol at three different load levels [30%, 60% and 80% of maximal inspiratory pressure], in patients who had previously undergone coronary artery bypass grafting. Methods: Nineteen late postoperative myocardial revascularization patients participating in a cardiovascular rehabilitation program were studied. Maximal inspiratory pressure maneuvers were performed. An inspiratory muscle endurance protocol at 30%, 60% and 80% of maximal inspiratory pressure was applied for four minutes each, in random order. Heart rate and RR intervals were recorded and heart rate variability was analyzed by time (RMSSD-the mean of the standard deviations for all R-R intervals, and RMSM-root-mean square differences of successive R-R intervals) and frequency domains indices (high and low frequency) in normalized units. ANOVA for repeated measurements was used to compare heart rate variability indices and Student t-test was used to compare the maximal inspiratory pressure and maximal expiratory pressure values. Results: Heart rate increased during performance of maximal respiratory pressures maneuvers, and the maximal inspiratory pressure and maximal expiratory pressure mean values were significantly lower than predicted values (P <0.05). RMSSD increased significantly at 80% in relation to rest and 30% of maximal inspiratory pressure and RMSM decreased at 30% and 60% of maximal inspiratory pressure in relation to rest (P <0.05). Additionally, there was significant and progressive decrease in low frequency and increase in high frequency at 30%, 60% and 80% of maximal inspiratory pressure in relation to the resting condition. Conclusion: These results suggest that respiratory muscle training at high intensities can promote greater parasympathetic activity and it may confer important benefits during a rehabilitation program in post-coronary artery bypass grafting. (AU)

• Processo FAPESP: 09/01842-0 - Análise dos ajustes centrais e metabólicos periféricos durante o exercício físico dinâmico versus resistido em pacientes com DAC: efeitos de um programa de treinamento resistido baseado na determinação do limiar anaeróbio por diferentes metodologias
• Beneficiário: Audrey Borghi Silva
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores