orthostatic intolerance/hypoxia

Six male subjects were exposed on two separate occasions to simulated microgravity with 28 degrees head-down tilt (HD) for 1 h with baseline followed by recovery at + 17 degrees head-up. Pulmonary ventilation, gas exchange, spirometry, and central and cerebral blood flow characteristics were

OBJECTIVE To try to find a new method for countermeasuring the effect of simulated weightlessness. METHODS The study was carried out in fifteen male healthy subjects, 19-22 years, -6 degrees head-down bed rest (-6 degrees HDBR) for 21 d was used as a weightlessness simulation model. The subjects

The effect of moderate hypoxemia upon postural sympathetic vasoconstrictor reflexes in skeletal muscle was studied in five healthy young students, aged 20-30 years. The vasoconstrictor response to head-up tilt was studied in brachio radial muscle kept at heart level and in the anterior tibial

Dilation of the pulmonary arteries and increased pulmonary blood volume are recorded in sudden infant death syndrome and in infants living at low barometric pressures (high altitude). Low barometric pressure leads to chronic alveolar hypoxia (1,2). There is diversion and loss of body-fluid under

BACKGROUND During spaceflight, changes in the cardiovascular system and in pulmonary mechanics take place but no apparent impairment of respiratory function occurs. However, little is known about the first hours in microgravity. OBJECTIVE The changes occurring at the same time in the cardiovascular