The difference between mean inspiratory and expiratory respiratory reactance (delta(rs)) measured with forced oscillation technique (FOT) at 5 Hz allows the detection of expiratory flow limitation (EFL) in chronic obstructive pulmonary disease (COPD) patients breathing spontaneously. This aim of this study was to evaluate whether this approach can be applied to COPD patients during noninvasive ...

OBJECTIVE To identify changes in the forced and quiet breathing parameters of lung function in healthy children and adolescents exposed to passive smoking (PS). METHOD Comparative cross-sectional study. Healthy schoolchildren aged 6 to 14 years. We collected anthropometric data, lung function parameters using spirometry (forced breathing), and quiet breathing parameters using impulse oscillom...

Warning labels on violent television programs give viewers discretionary advice and, therefore, might arouse reactance in viewers of all ages. Information labels give viewers information but no advice and, therefore, should not arouse reactance. Five age groups were tested: 9-11 year olds, 12-14 year olds, 15-17 years olds, 18-20 year olds, and adults at least 21 years old. Participants (N5900)...

This study examined smokers’ reactions to antismoking messages that emphasized either the harms of secondhand smoke or vulnerability to smoking addiction and framed the need for smoking cessation using either gain or loss message frames. One hundred fifty-four college smokers participated in a study that used a 2 x 2 factorial design crossing message type (secondhand smoke appeals, smoking addi...

This paper proves the invariance of the second-order modes of continuous-time systems under general frequency transformation, that is, under reactance function. The invariance is proved by obtaining the state-space representation of the transformed system, and its controllability / observability grammians in terms of those of the original system and the reactance system. This invariance propert...

Deep inspirations modulate airway caliber and airway closure and their effects are impaired in asthma. The association between asthma and obesity raises the question whether the deep inspiration (DI) effect is also impaired in the latter condition. We assessed the DI effects in obese and nonobese nonasthmatics. Thirty-six subjects (17 obese, 19 nonobese) underwent routine methacholine (Mch) cha...

Nasal mucosa has an extraordinary nerve supply with unique geometry that encompasses complex physiology. Among these, side-specific predilections to the respiratory and autonomic centers are the interesting issues that have been raised about the consequences of the nasal irritations. The aim of the study was an evaluation of how intranasal stimulation influences lung mechanics and determines wh...

BACKGROUND Within-breath reactance from forced oscillometry estimates resistance via its inspiratory component (X(rs,insp)) and flow limitation via its expiratory component (X(rs,exp)). AIM To assess whether reactance can detect recovery from an exacerbation of chronic obstructive pulmonary disease (COPD). METHOD 39 subjects with a COPD exacerbation were assessed on three occasions over 6 w...

The effects of three different regimens of inhaled bronchodilators on spirometry and respiratory impedance as measured with the technique of forced oscillations were compared in a double-blind crossover study in 22 patients with stable chronic obstructive pulmonary disease (FEV1 less than 70 percent predicted). On three trial days, patients inhaled, in random order, 40 micrograms ipratropium br...

Title of Dissertation: THE DYNAMICS OF REACTANCE AND COGNITIVE STRUCTURE: REACTANCE, RESTORATION, AND TIME. Elena Bessarabova, Ph.D., 2010 Directed By: Professor Edward L. Fink and Professor Monique M. Turner, Department of Communication This dissertation examined the effects of freedom-limiting communication on attitude structures at three points in time. A 2 (Threat to freedom: low threat vs....