High-Intensity Inspiratory Protocol Increases Heart Rate Variability in Myocardial Revascularization Patients
Rev. bras. cir. cardiovasc
; Rev. bras. cir. cardiovasc;31(1): 38-44, Jan.-Feb. 2016. tab, graf
Article
em En
| LILACS
| ID: lil-778375
Biblioteca responsável:
BR1.1
ABSTRACT
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.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Músculos Respiratórios
/
Exercícios Respiratórios
/
Inalação
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Ponte de Artéria Coronária
/
Exercícios de Alongamento Muscular
/
Frequência Cardíaca
Tipo de estudo:
Etiology_studies
/
Evaluation_studies
/
Prognostic_studies
Limite:
Aged
/
Humans
/
Male
Idioma:
En
Revista:
Rev. bras. cir. cardiovasc
Assunto da revista:
CARDIOLOGIA
/
CIRURGIA GERAL
Ano de publicação:
2016
Tipo de documento:
Article
/
Project document
País de afiliação:
Brasil
País de publicação:
Brasil