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Forced Oscillation Technique (FOT) is a noninvasive method to assess lung function during normal breathing. Differently from spirometry, where the subject is requested to forcefully and repeatedly exhale all the air from the maximum to the lowest reachable lung volume, FOT uses a small pressure oscillation (equivalent to the pressure exerted by 2 cm of water) over imposed on regular quiet breathing to “force” a small quantity of air to move in and out the respiratory system. To separate the response of the respiratory system from the spontaneous breathing activity, the respiratory system is stimulated using pressure oscillations that are at least 10 times faster of the human breathing frequencies ranging from 4 Hz up to 40 Hz. Since slow pressures (i.e. < 10 Hz) are more able to probe lung periphery ((Bates & Suki, 2008) they are used to measure the entire system alone or in combination with faster stimuli.