High-intensity inspiratory protocol increases heart rate variability in myocardial revascularization patients

High-intensity inspiratory protocol increases heart rate variability in myocardial revascularization patients

Author Rossi Caruso, Flavia Cristina Google Scholar
Simoes, Rodrigo Polaquini Google Scholar
Reis, Michel Silva Google Scholar
Guizilini, Solange Autor UNIFESP Google Scholar
dos Santos Alves, Vera Lucia Google Scholar
Papa, Valeria Google Scholar
Arena, Ross Google Scholar
Borghi-Silva, Audrey Google Scholar
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.
Keywords Autonomic Nervous System
Respiratory Muscles
Heart Rate
Physical Therapy Modalities
Coronary Artery BypassObstructive Pulmonary-Disease
Bypass Graft-Surgery
Cardiovascular-Disease
Respiratory Movements
Autonomic Function
Cardiac-Surgery
Cabg Surgery
Failure
Physiotherapy
Complications
Language English
Sponsor FAPESP [2009-01842-0]
Grant number FAPESP: 2009-01842-0
Date 2016
Published in Brazilian Journal Of Cardiovascular Surgery. Sao paulo sp, v. 31, n. 1, p. 38-44, 2016.
ISSN 0102-7638 (Sherpa/Romeo, impact factor)
Publisher Hospital Clinicas, Univ Sao Paulo
Extent 38-44
Origin http://dx.doi.org/10.5935/1678-9741.20160007
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000390088400008
SciELO ID S0102-76382016000100038 (statistics in SciELO)
URI http://repositorio.unifesp.br/handle/11600/49311

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