Respiratory air flow transducer calibration technique for forced vital capacity test

[Association between the forced midexpiratory flow/forced vital capacity ratio and bronchial hyperresponsiveness].

OBJECTIVE A long-standing hypothesis is that a low ratio of airway caliber to lung size is associated with bronchial hyperresponsiveness (BHR). The aim of our study was to measure the association between airway caliber relative to lung size (expressed as the ratio between forced expiratory flow, midexpiratory phase, divided by forced vital capacity [FEF(25%-75%)/FVC]) and BHR measured by a meth...

Use of forced vital capacity and forced expiratory volume in 1 second quality criteria for determining a valid test

The 2005 American Thoracic Society (ATS)/European Respiratory Society (ERS) spirometry guidelines define valid tests as having three acceptable blows and a repeatable forced vital capacity (FVC) and forced expiratory volume in 1 s (FEV1). The aim of this study was to determine how reviewer and computer-determined ATS/ERS quality could affect population reference values for FVC and FEV1. Spirome...

Forced Vital Capacity (FVC) and Forced Vital Capacity in 1 Second (FEV1) of Apparently Healthy Non-smoker Adult Obese

A Simple Measure to Assess Hyperinflation and Air Trapping: 1-Forced Expiratory Volume in Three Second / Forced Vital Capacity

BACKGROUND Several recent studies have suggested that 1 minus-forced expiratory volume expired in 3 seconds / forced vital capacity (1-FEV3/FVC) may be an indicator of distal airway obstruction and a promising measure to evaluate small airways dysfunction. AIMS To investigate the associations of 1-FEV3/FVC with the spirometric measures and lung volumes that assess small airways dysfunction an...

Effects of forward head posture on forced vital capacity and respiratory muscles activity

[Purpose] This study investigated the effects of forward head posture on forced vital capacity and deep breathing. [Subjects] Twenty-six subjects, divided into the two groups (normal and forward head posture groups), participated in this study. [Methods] Forced vital capacity and forced expiratory volume in 1 second were measured using respiratory function instrumentation that met the American ...