[Effect on humans and animals of multiple exposures to rarefied atmospheres]

In order to study the chronic form of decompression disease, clinical and physiological examinations of 38 test subjects were carried out. They participated in 133 chamber experiments and were exposed to an altitude of 11,000--12,000 m for 2--3 to 20--24 hours after desaturation of different duration. Besides, histological and histochemical examinations of organs and tissues of 3 dogs were performed. During 70, 110 and 140 days the dogs were exposed 20, 33 and 35 times to an altitude of 12,000 m for 2--2.5 hours without preliminary desaturation. No persistent pathological changes were found in the animal or human body.