Über den therapeutischen Einfluß kurzer Schallwellen auf das Ohr

Some Aspects of Temperature, Moisture And Heat Relationships in The Upper Respiratory Tract

“…Proetz (1941) summarizes the result of many workers and remarks that the upper respiratory tract yields about a pint of water and 470 calories to respiratory air in a day. Perwitzschky (1927) follows a critical survey of previous work by an exhaustive series of experiments indicating that during nasal breathing, inspiratory air almost reaches alveolar temperature and moisture content by the time it is passing through the trachea, also that expiratory air is cooler and contains less moisture than alveolar air when it leaves the body.…”

“…The present writer felt that further investigation of the air conditioning efficiency of the upper respiratory tract could perhaps yield interesting facts, and by a method similar to that used by Perwitzschky (1927), attempted to demonstrate the effects of higher respiratory rates on the moistening and warming of inspiratory air and also to compare the efficiency of the upper respiratory tract with a simple heat and moisture exchange apparatus.…”

“…It would appear that of this total a considerable quantity is returned to the respiratory tract by the expiratory air. Perwitzschky (1927) inspiratory air in the oropharynx to contain 30-34 gm./c.m. of water and to be at a temperature of 32-34 0 C. (90-93 0 F.) with respiratory rates of 7 to 42 l./min.…”