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Article Dans Une Revue (Data Paper) Respiratory Physiology & Neurobiology Année : 2022

Intercostal muscle oxygenation and expiratory loaded breathing at rest: Respiratory pattern effect

Résumé

In patients with airway obstruction, an increase in breathing frequency at rest is commonly associated with a dynamic hyperinflation (DH). In such a situation, intercostal muscle oxygenation may be disturbed. This hypothesis was examined in a context of simulated airway obstruction in healthy subjects. After a control period of 5 min, twelve participants (20 ± 2 years) breathed at rest through a 20-cmH2O expiratory threshold load, either by increasing or reducing their respiratory rate (ETLF+ or ETLF). Tissue saturation index (TSI) and concentration changes in oxyhaemoglobin (oxy[Hb+Mb]) were measured as well as cardiorespiratory variables. Inspiratory capacity was decreased in ETLF+ (p < 0.001) and correlated with dyspnea. An increase in oxy[Hb+Mb] occurred in ETLF+ that was higher than in ETLF (p < 0.01). TSI was not different between conditions. In healthy subjects at rest, an increase in respiratory rate during a simulated obstruction with an expiratory threshold load resulted in paradoxical response with DH emergence while intercostal muscle oxygenation was preserved.
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hal-04563409 , version 1 (22-07-2024)

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Quentin Bretonneau, Claire de Bisschop, Valentin Mons, Aurélien Pichon. Intercostal muscle oxygenation and expiratory loaded breathing at rest: Respiratory pattern effect. Respiratory Physiology & Neurobiology, 2022, 304, pp.103925. ⟨10.1016/j.resp.2022.103925⟩. ⟨hal-04563409⟩
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