Lenz H, Theelen W, Eichler J
HNO. 1985 Feb;33(2):58-61.
Observations on cyclical variations in the nasal resistance were made using active anterior rhinomanometry. About 80% of 40 healthy individuals showed a nasal cycle with a mean period of 2.5 h. Measurements were made during a 8 h at intervals of 30 min. Quantitative values for the variations of the flow volume V1.5 at 1.5 hPa are given and discussed.