Chest
Clinical InvestigationsThe Pattern of Respiratory Muscle Recruitment during Pursed-Lip Breathing
Section snippets
MATERIALS AND METHODS
Thirteen patients with stable severe COPD participated in this clinical investigation. Informed consent was obtained from each subject. Pulmonary function tests were performed prior to the experimental trials (Collins DSII Plus spirometer 1167).
The pattern of respiratory muscle recruitment and pulmonary function tests were measured. Two minute trials of two breathing conditions, baseline tidal breathing (TB) and PLB, were carried out while subjects were seated in an upright position at rest.
RESULTS
Thirteen male patients (mean age, 61 ±6 yr) with moderately severe and severe COPD (mean FEV1 = 1.05 ±0.44 L/s) participated in the study.
Their characteristics (mean ± SD) are shown in the following tabulation:
No. of subjects 13 Gender male Age, yr 63 ± 7 FEV1, L 1.05 ± 0.44 FEV1, percent of predicted 37 ± 12 FVC, L 2.3 ± 0.9 FVC, percent of predicted 57 ± 16 Maximal inspiratory pressure (MIP), cm H2O 66 ± 31 Pdimax, cm H2O 72.6 ± 20.3
When compared with baseline TB, PLB resulted in statistically
DISCUSSION
Several changes in the pattern of respiratory muscle recruitment were observed with PLB. When compared with TB, PLB led to increases in inspiratory rib cage and accessory muscle recruitment and reductions in diaphragm recruitment during inspiration; overall Pdi did not change. There were also increases in expiratory rib cage and abdominal muscle recruitment with PLB. Duty cycle of the inspiratory muscles and the RR were decreased from TB with PLB. Also, during PLB the pattern of diaphragm
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Supported in part by NCNR and NIH F32 NR06339.