**Abbreviation/Nomenclature list**

AHI: Apnea-hypopnea index AUC: Area under preceding control curve subtended by the NEP curve BMI: Body mass index EFL: Expiratory flow limitation

FEV1: Forced expiratory volume in 1 second FRC: Functional residual capacity FVC: Forced vital capacity AUC: Area under control tidal curve subtended by the immediately following NEP curve NEP: Negative expiratory pressure OSA: Obstructive sleep apnea PEF: Peak expiratory flow PIIA, post-inspiratory inspiratory activity Vt: Tidal volume Ti: Inspiratory time Te: Expiratory time TLC: Total lung capacity

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*Medicine,* Vol. 126, pp. 206-210, ISSN 00030805.

*cine,* Vol. 150, pp. 1581-1586, ISSN 1073-449X.

ISSN 1073-449X.

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