In an attempt to detect the influence of various kinds of face masks and a nasal nozzle on nasal airflow, we made measurements of nasal resistance by a head-out body plethysmograph with or without the masks on the face or the nozzle to the nostril of the normal adult subjects. The mean values of nasal resistance with the masks differed from the mean values without the masks significantly. No si...

The Mechanics of Breathing and Stabilization of Ventilation in Patients With Unilateral Cerebral Infarction • The mechanics of breathing and responses of the respiratory system to CO2 during resistance breathing were studied in 12 patients with clinical evidence of unilateral cerebral infarction and compared with the findings in normal subjects. The respiratory abnormalities in patients with ce...

Familial aggregation of chronic obstructive pulmonary disease (COPD) has been demonstrated, but linkage analysis of COPD-related phenotypes has not been reported previously. An autosomal 10 cM genome-wide scan of short tandem repeat (STR) polymorphic markers was analyzed for linkage to COPD-related phenotypes in 585 members of 72 pedigrees ascertained through severe, early-onset COPD probands w...

The aim of the present study was to measure age-specific prevalence of airflow obstruction in Switzerland in smokers and never-smokers using pulmonary function tests and respiratory symptoms from 6,126 subjects participating in the Swiss Cohort Study on Air Pollution and Lung Diseases in Adults. The lower limit of normal of the forced expiratory volume in 1 s/forced vital capacity ratio was use...

In cycling, air resistance corresponds to 90% of the on bicycle and cyclist 70% this is applied body cyclist. Despite research postures that could reduce resistance, few studies have been conducted full-body cycling suits. As aerodynamics surface shape clothing fabric are still unclear, airflow around cyclists were examined using a computational fluid dynamics (CFD) method wind tunnel experimen...

Characterization of the airflow across food items involves identification their viscous and inertial resistances. This paper presents an extensive numerical experimental study to determine resistances placed in array. The used array sliced sweet potato with different initial slice diameters. resistance was determined from a series wind tunnel measurements. arrays were dehydrated digital images ...

Airflow through the upper airways is a basic ingredient for human speech production. In real life, the airflow is subjected to complex initial and boundary conditions defined by upper airway geometry, tissue properties and airflow. In order to increase understanding, the current paper considers airflow through simplified geometries derived from ‘in-vivo’ rigid and steady upper airway configurat...

The embouchure of a musician plays crucial role in the correct tuning an instrument. This work examines influence lip position, force and blowing pressure on alto saxophone mouthpiece. measurements were collected by means artificial mouth setup which mimics realistic playing condition. range forces pressures mouthpiece generates chosen note, is defined as total playability area (TPA) for that n...

History of treatment for tuberculosis (TB) is a risk factor for obstructive lung disease. However, it has been unclear whether the clinical characteristics of patients with destroyed lung by TB differ according to the presence or absence of airflow limitation. The objective of the study was to evaluate differences in acute exacerbations and forced expiratory volume in 1 second (FEV1) decline in...

Airflow hazards such as turbulence, vortices, or low-level wind shear can pose a threat to landing aircraft and are especially dangerous to helicopters. Because pilots usually cannot see airflow, they may be unaware of the extent of the hazard. We have developed a prototype airflow hazard visual display for use in helicopter cockpits to alleviate this problem. We report on the results of a prel...