Inspiratory High Frequency Airway Oscillation Attenuates Resistive Loaded Dyspnea and Modulates Respiratory Function in Young Healthy IndividualsReportar como inadecuado




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Direct chest-wall percussion can reduce breathlessness in Chronic Obstructive Pulmonary Disease and respiratory function may be improved, in health and disease, by respiratory muscle training RMT. We tested whether high-frequency airway oscillation HFAO, a novel form of airflow oscillation generation can modulate induced dyspnoea and respiratory strength and-or patterns following 5 weeks of HFAO training n = 20 compared to a SHAM-RMT conventional flow-resistive RMT device n = 15 in healthy volunteers 13 males; aged 20–36 yrs. HFAO causes oscillations with peak-to-peak amplitude of 1 cm H2O, whereas the SHAM-RMT device was identical but created no pressure oscillation. Respiratory function, dyspnoea and ventilation during 3 minutes of spontaneous resting ventilation, 1 minute of maximal voluntary hyperventilation and 1 minute breathing against a moderate inspiratory resistance, were compared PRE and POST 5-weeks of training 2×30 breaths at 70% peak flow, 5 days a week. Training significantly reduced NRS dyspnoea scores during resistive loaded ventilation, both in the HFAO p = 0.003 and SHAM-RMT p = 0.005 groups. Maximum inspiratory static pressure cm H2O was significantly increased by HFAO training vs. PRE; p<0.001. Maximum inspiratory dynamic pressure was increased by training in both the HFAO vs. PRE; p<0.001 and SHAM-RMT vs. PRE; p = 0.021 groups. Peak inspiratory flow rate L.s−1 achieved during the maximum inspiratory dynamic pressure manoeuvre increased significantly POST vs. PRE; p = 0.001 in the HFAO group only. HFAO reduced inspiratory resistive loading–induced dyspnoea and augments static and dynamic maximal respiratory manoeuvre performance in excess of flow-resistive IMT SHAM-RMT in healthy individuals without the respiratory discomfort associated with RMT.



Autor: Theresa Morris, David Paul Sumners, David Andrew Green

Fuente: http://plos.srce.hr/



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