Longitudinal association between respiratory muscle strength and cough capacity
DOI:
https://doi.org/10.2340/16501977-1986Keywords:
spinal cord injury, respiratory muscles, expiratory airflow, cough, longitudinal analysis.Abstract
OBJECTIVE: To assess the longitudinal association between respiratory muscle strength and cough capacity in persons with recent spinal cord injury. DESIGN: Longitudinal analyses. SUBJECTS: Forty persons with recent spinal cord injury and impaired pulmonary function. METHODS: Measurements were performed 4 weeks after the start of rehabilitation, 9 and 17 weeks after the first measurement, and one year after discharge from inpatient rehabilitation. Peak cough flow was measured with a spirometer. Maximum inspiratory and expiratory pressures (MIP and MEP), expressed in cmH2O, were measured at the mouth. RESULTS: Both MIP and MEP were significantly positively associated with peak cough flow. After correction for confounders and time 10 cmH2O higher MIP was associated with a 0.32 l/s higher peak cough flow, and a 10 cmH2O higher MEP was associated with a 0.15 l/s higher peak cough flow. The association between MIP and peak cough flow was mainly based on within-subject variance. The association between MIP and peak cough flow was stronger than between MEP and peak cough flow. CONCLUSION: Improvement in respiratory muscle strength is associated with improvement in cough capacity in persons with recent spinal cord injury who have impaired pulmonary function.Downloads
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