Deep breathing heart rate variability is associated with respiratory muscle weakness in patients with chronic obstructive pulmonary disease
Clinics
;
65(4): 369-375, 2010. graf, tab
Artículo
en Inglés
| LILACS
| ID: lil-546324
ABSTRACT
BACKGROUND:
A synchronism exists between the respiratory and cardiac cycles. However, the influence of the inspiratory muscle weakness in chronic obstructive pulmonary disease (COPD) on cardiac autonomic control is unknown. The purpose of the present investigation was to evaluate the influence of respiratory muscle strength on autonomic control in these patients.METHODS:
Ten chronic obstructive pulmonary disease patients (69±9 years; FEV1/FVC 59±12 percent and FEV1 41±11 percent predicted) and nine age-matched healthy volunteers (64±5 years) participated in this study. Heart-rate variability (HRV) was obtained at rest and during respiratory sinusal arrhythmia maneuver (RSA-M) by electrocardiograph.RESULTS:
Chronic obstructive pulmonary disease patients demonstrated impaired cardiac autonomic modulation at rest and during RSA-M when compared with healthy subjects (p<0.05). Moreover, significant and positive correlations between maximal inspiratory pressure (MIP) and the inspiratory-expiratory difference (ΔIE) (r = 0.60, p<0.01) were found.CONCLUSION:
Patients with chronic obstructive pulmonary disease presented impaired sympathetic-vagal balance at rest. In addition, cardiac autonomic control of heart rate was associated with inspiratory muscle weakness in chronic obstructive pulmonary disease. Based on this evidence, future research applications of respiratory muscle training may bring to light a potentially valuable target for rehabilitation.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Respiración
/
Músculos Respiratorios
/
Debilidad Muscular
/
Enfermedad Pulmonar Obstructiva Crónica
/
Frecuencia Cardíaca
Tipo de estudio:
Estudio de etiología
/
Factores de riesgo
Límite:
Anciano
/
Femenino
/
Humanos
/
Masculino
Idioma:
Inglés
Revista:
Clinics
Asunto de la revista:
Medicina
Año:
2010
Tipo del documento:
Artículo
País de afiliación:
Brasil
/
Estados Unidos
Institución/País de afiliación:
Federal University of São Carlos/BR
/
Virginia Commonwealth University/US
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