High-Intensity Inspiratory Protocol Increases Heart Rate Variability in Myocardial Revascularization Patients
Rev. bras. cir. cardiovasc
;
31(1): 38-44, Jan.-Feb. 2016. tab, graf
Artículo
en Inglés
| LILACS
| ID: lil-778375
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.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Músculos Respiratorios
/
Ejercicios Respiratorios
/
Inhalación
/
Puente de Arteria Coronaria
/
Ejercicios de Estiramiento Muscular
/
Frecuencia Cardíaca
Tipo de estudio:
Estudio de etiología
/
Estudios de evaluación
/
Estudio pronóstico
Límite:
Anciano
/
Humanos
/
Masculino
Idioma:
Inglés
Revista:
Rev. bras. cir. cardiovasc
Asunto de la revista:
Cardiología
/
Cirugía General
Año:
2016
Tipo del documento:
Artículo
/
Documento de proyecto
País de afiliación:
Brasil
Institución/País de afiliación:
Federal University of São Carlos/BR
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