BACKGROUND Multifrequency bioelectrical impedance analysis (MF-BIA) is a technique that measures body impedance (Z) at different frequencies (5, 10, 50, 100, and 250 kHz). Body composition may be estimated using empirical equations, which include BIA variables or, alternatively, raw BIA data may provide direct information on water distribution and muscle quality. OBJECTIVES To compare raw MF-...

BACKGROUND The physiologic mechanisms by which exercise may clear secretions in subjects with cystic fibrosis (CF) are unknown. The purpose of this study was to compare ventilation, respiratory flow, and sputum properties following treadmill and cycle exercise with resting breathing (referred to as "control"). METHODS In 14 adult subjects with CF, ventilation and respiratory flow were measure...

OBJECTIVE Recent work has suggested that within-breath respiratory impedance measurements performed using the forced oscillation technique may help to noninvasively evaluate respiratory mechanics. We investigated the influence of airway obstruction on the within-breath forced oscillation technique in smokers and chronic obstructive pulmonary disease patients and evaluated the contribution of th...

OBJECTIVE To utilize real-time electrical impedance tomography to guide lung protective ventilation in an animal model of acute respiratory distress syndrome. DESIGN Prospective animal study. SETTING Animal research center. SUBJECTS Twelve Yorkshire swine (15 kg). INTERVENTIONS Lung injury was induced with saline lavage and augmented using large tidal volumes. The control group (n = 6) ...

The aim of the study was to determine whether the response of respiratory impedance (Zrs) to decreasing levels of continuous negative airway pressure (CNAP) during wakefulness, differs in controls and subjects with obstructive sleep apnoea syndrome (OSAS). Zrs was measured by the forced oscillation technique (4-32 Hz) in 15 controls and 21 patients with OSAS (apnoea/hypopnoea index >20 per slee...

OBJECTIVE To measure the imposed power of breathing (imposed work of breathing per minute) associated with spontaneous breathing through an active impedance threshold device and a sham impedance threshold device. DESIGN Prospective randomized blinded protocol. SETTING University medical center. PATIENTS Nineteen healthy, normotensive volunteers (10 males, 9 females, age range 20-56 y, mea...

BACKGROUND Forced oscillation technique (FOT) has been reported to be useful in the evaluation and management of obstructive lung disease, including COPD. To date, no data are available concerning long-term changes in respiratory system impedance measured by FOT. Additionally, although exacerbations have been reported to be associated with excessive lung function decline in COPD, the impact of ...

Breathing disorders of different etiologies are frequent problems in neonatal intensive care, but also in hospital and outpatient treatment of small infants. Thus, there is a great need for secure and practicable assessment of infants’ respiratory movements and detection of apneas. Current measurement techniques for this purpose include piezo elements, infra red sensors, pneumatic elements, tho...