![]() ![]() Cependant cette hypothèse n’a jamais été vérifiée. L’appareil respiratoire autonome (SCBA) augmente la pression expiratoire pour maintenir des hauts régimes de ventilation et augmenter ainsi le travail lors de l’expiration (WOB). ![]() The SCBA regulator causes an increase in the active expiratory resistive work to maintain high ventilatory rates and an increase inspiratory elastic work through an elevation in lung volumes. min –1 in the BA condition), active expiratory resistive work increased by 59% ± 51%, inspiratory elastic work increased by 26% ± 24%, and total WOB increased by 13% ± 12% in the BA condition ( p End-inspiratory and -expiratory lung volumes were elevated ( p < 0.05) in the BA condition at higher ventilation rates, which increased inspiratory elastic work and decreased expiratory elastic work at 180 and 210 W ( p < 0.05). There were no differences in WOB between BA and RV conditions at 150 W. Modified Campbell diagrams were created to calculate the resistive and elastic components of WOB during inspiration and expiration. Inspired and expired tidal volumes were measured using a body plethysmograph, whereas esophageal pressures were measured with an esophageal balloon. Twelve healthy male subjects underwent two randomized exercise trials, consisting of cycling at 150, 180, 210, and 240 W. The objective of this study, therefore, was to determine if the WOB is increased with the SCBA regulator (BA condition) compared with a low-resistance breathing valve (RV condition) during exercise. The self-contained breathing apparatus (SCBA) increases the expiratory pressure required to maintain high rates of ventilation, suggesting that the expiratory work of breathing (WOB) is increased however, this has never been reported. ![]()
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