Measurements of lung volumes, airway conductance (Ca) and expiratory flow rates were compared in 40 patients with chronic obstructive pulmonary d i i (COPD) who were observed for an average of 3.3 years. The first and find study of each patient were compared and the average changes for the group were analyzed statistically. Although a diminution in expiratory flow rate was an almost invariable ...

In patients with chronic obstructive pulmonary disease (COPD), reduced levels of daily physical activity are associated with the degree of impairment in lung, peripheral muscle, and central hemodynamic function. There is, however, limited evidence as to whether limitations in tidal volume expansion also, importantly, determine daily physical activity levels in COPD. Eighteen consecutive patient...

OBJECTIVE To determine whether weight loss in women with morbid obesity subjected to bariatric surgery alters lung function, respiratory muscle strength, functional capacity and the level of habitual physical activity and to investigate the relationship between these variables and changes in both body composition and anthropometrics. METHODS Twenty-four women with morbid obesity were evaluate...

The morbidly obese are known to have impaired respiratory function. A prospective study of the changes in lung volumes, carbon monoxide transfer, and arterial blood gas tensions was undertaken in 29 morbidly obese patients before and after surgery to induce weight loss. Before surgery the predominant abnormality in respiratory function was a reduction in lung volumes. These increased towards no...

Upright immersion imposes a pressure imbalance across the thorax. This study examined the effects of air-delivery pressure on inspiratory muscle work during upright immersion. Eight subjects performed respiratory pressure-volume relaxation maneuvers while seated in air (control) and during immersion. Hydrostatic, respiratory elastic (lung and chest wall), and resultant static respiratory muscle...

Introduction The basic 4 volumes do not overlap each other: tidal volume, inspiratory and expiratory reserve volumes and residual volume. On the other hand, lung capacities include two or more volumes: inspiratory capacity, vital capacity, functional residual capacity and total lung capacity. Spirographic examination of lung functions is characterized by the following main changes: in the obstr...

The relationship between lung volume and regional distribution of ventilation measured by the single breath oxygen test has been found to be similar in the upright and supine positions. When subjects breathe at progressively smaller lung volumes there is an increase in the slope of the alveolar plateau indicative of a redistribution of ventilation to the uppermost parts of the lung. On assuming...

BACKGROUND There are not many studies about the effects of physical activity on pulmonary function in normal population. However, it seems that strengthening and persevering respiratory muscles is an effective technique for improving pulmonary function. OBJECTIVE The purpose of this study was to evaluate and compare the effects of eight-week aerobic, resistance, and interval exercise routines...