Influência da obstrução e hiperinsuflação pulmonar na atividade dosmúsculos respiratórios e mobilização de volumes pulmonares

by Santos Silva, Thayse Neves

Abstract (Summary)
Ventilatory patterns adopted during muscular resistance tests have been reported in various studies however, there are few reports comparing muscular contractility and its mechanical efficiency on respiratory system in patients with COPD. Theaim of this study was to assess Impact of pulmonary obstruction and hyperinflation on the respiratory muscles activity and pulmonary volumes mobilization. We evaluated 22 individuals from both sexes, 14 COPD patients (FEV1 = 54.1 ± 15.9 % predicted) and 8 healthy volunteers (control, FEV1 = 98.5 ± 17.6 % predicted), mean age (COPD 63.2 ± 11.3 and control 56.5 ± 7.9). All subjects were submitted to MIP and resistance tests (incremental loading test), and electromyography of scalene, sternocleidomastoid and diaphragm muscles and ventilatory strategy were measured through mobilized volumes during incremental loading test. Data were analyzed through Student t-test or Mann Whitney test, 2-way ANOVA, ANOVA with repeated measures followed by Tukey and Spearman correlation test also was run to identify associations between variables spirometric, EMG activies and expired volume values during test incremental loading. Although the level of MIP was lower in COPD group compared to control, electromyography was similar in both groups. Furthermore, the addition of load altered only scalene muscular activity, while loads equal to 60% MIP showed the predominance of accessory activity during ventilation. In conclusion, we suggested that force and resistance deficits of inspiratory muscles were more related to respiratory mechanics alterations than possible damages in the inspiratory muscles contractility
This document abstract is also available in Portuguese.
Bibliographical Information:

Advisor:Armele de Fátima Dornelas de Andrade

School:Universidade Federal de Pernambuco

School Location:Brazil

Source Type:Master's Thesis

Keywords:Inspiratory muscle Electromyography COPD


Date of Publication:12/28/2006

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