In diagnostic evaluation of the nose and allergology, the transnasal pressure delta p and the volume flow V is measured during breathing. It is shown that information is lost when measurements are represented form of a rhinomanogram. It is proposed using the measurements to derive the power during breathing and the mean volume flow of a breathing cycle. At a variable amplitude of breathing, the respiration power can be represented as a function of the mean air flow. For this purpose the software of available rhinomanometers merely has to be modified.