[Various aspects of determining physical work capacity of humans in hyperbaric environment]. / Nekotorye aspekty opredeleniia fizicheskoi rabotosposobnosti cheloveka v usloviiakh giperbarii.

Physical work capacity of man during real and stimulated dives is discussed in view of the reported data. The parameter is known to decrease as the breathing gas density and immersion depth increase. The factors limiting the work capacity growth are as follows: greater respiration resistance, higher energy cost of ventilation, CO2 retention, dyspnea, adverse circulation changes. During exposure hyperbaric bradycardia occurs both at rest and upon a work load. This precludes prediction of physical work capacity on the basis of the heart rate alone as a parameter used in a normobaric environment. The paper contains tabulated data on the work capacity of divers at various depths obtained by different authors.

[General characteristics of an experiment to study the ontogeny of rats on board the Kosmos-1514 biosatellite]. / Obshchaia kharakteristika éksperimenta po izucheniiu ontogeneza krys na biosputnike "Kosmos-1514".

Ten female Wistar rats were exposed to zero-g during 5 days, i. e., from gestation day 13 to day 18. After recovery the flight animals showed a significant delay in weight gain, thymus involution, decreased liver weight, hemoglobin concentration. Nevertheless, their reproductive function did not differ from that of the controls: the rate of preimplantation and total fetal mortality as well as the number of live fetuses were very similar in the experimental and control animals. The flight group showed a slight decline of fetal weight and water content. The size of the litters produced by the flight and control rats was identical but the mortality rate of those former during the first 7 days after birth was significantly higher. This experiment has demonstrated that the mammalian fetus exposed to zero-g during the last term of pregnancy, i. e., at the stage of active organogenesis, can grow and develop in the normal way. A large body of biological material has been obtained for biochemical and histological examinations that will help evaluate the condition of dams, fetuses, and newborns.

[Potential disturbance in the regulation of respiration during hyperbaric nitrogen narcosis]. / O vozmozhnosti narusheniia reguliatsii dykhaniia v usloviiakh giperbaricheskogo azotnogo narkoza.

In order to explore the possibility of disorders in the respiration regulation under conditions of hyperbaric nitrogen narcosis, experiments on 4 test subjects were carried out. Nitrogen narcosis was simulated by nitrous oxide. The ventilation increment was measured as a function of an increase of the hypercapnic stimulus. A combination of high degrees of hypercapnia and the narcotic effect may lead to ventilation inhibition and respiration disturbance.