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Physiologically optimized processes, such as respiration, walking, and cardiac function, usually show a range of variability about the optimized value. Airway resistance has, in the past, been noted as variable, and this variability has been connected to pulmonary disease (e.g., asthma). A hypothesis was presented many years ago that postulated airway resistance as an optimized parameter in healthy...
We have developed a simple pulmonary diagnostic device that measures respiratory resistance of adults and children. The device is Airflow Perturbation Device (APD). There are many commercially available respiratory diagnostic devices in clinical use, but the major advantage of the APD is that it is an effortless device that evaluates the respiratory resistance effortlessly. Further, it can do this...
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