The best peak expiratory flow is flow-limited and effort-independent in normal subjects.

Abstract

Recently, it has been suggested that peak expiratory flow (PEF) may be determined by the wave speed flow-limiting mechanism. In six normal male subjects (age = 33 +/- 8 years) performing expiratory forced vital capacity (FVC) maneuvers, a negative expiratory pressure (NEP) of -10 cm H2O was randomly applied at the beginning of maximal expiration to assess… (More)

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