Expiratory pattern and laryngeal responses to single-breath expiratory resistance loads

• Published in: Respiration physiology Vol. 54; no. 3; pp. 307 - 316
• Main Authors: Daubenspeck, J.Andrew, Bartlett, Donald
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier B.V 01.01.1983; Amsterdam Elsevier
• Subjects: Adult; Air breathing; Airway Resistance; Animals; Biological and medical sciences; Cats; Control of breathing; Expiratory duration; Female; Fundamental and applied biological sciences. Psychology; Humans; Laryngeal aperture; Larynx - physiology; Lung volume; Lung Volume Measurements; Male; Mechanical loading; Mechanoreceptors - physiology; Pulmonary Stretch Receptors - physiology; Respiration; Respiratory system: anatomy, metabolism, gas exchange, ventilatory mechanics, respiratory hemodynamics; Vertebrates: respiratory system; Lung volume; Laryngeal aperture; Control of breathing; Mechanical loading; Expiratory duration; Human; Respiratory tract; Regulation(control); Expiration; Mechanics; Larynx; Pulmonary ventilation; Respiration
• ISSN: 0034-5687
• DOI: 10.1016/0034-5687(83)90074-9

Responses of expiratory duration (T E) and laryngeal aperture to small flow resistance loads (2 and 5 cm H 2O/LPS) applied to single expirations were measured using repeated applications in four subjects during quiet breathing. All subjects significantly prolonged T E in response to the higher load and 3 of the 4 showed that same response to the lower load, which was not perceived by these subjects. These same 3 subjects showed a narrowed laryngeal aperture in response to loading such that their expiratory impedance must have been greater than the increase provided by the load alone. The effect of such a loading response was to slow the expiratory volume decay so that a small but significantly increase in the halftime for volume decay was observed. The prolongation of T E seen with loading could be due to the alteration of volume-related feedback consequent to the increased expiratory impedance. This may serve a role in regulation of expiratory muscle function.