Abstract
This chapter discusses the experiment involving the effects on orthostatic tolerance and exercise response created by prolonged bedrest in antiorthostatic position. The objective of this work was to confirm the value of such a position where the intention is to stimulate the cardiovascular changes that occur during weightlessness. For the purpose of experiment, four healthy male volunteers with an average age of 25 years were selected after undergoing medical and psychological tests. Two tests were carried out for studying the orthostatic tolerance: first, with the patient passive on the tilting table at 85° for a period of 20 minutes and second, an active test, the squatting–standing up test during which a continuous recording was made of carotid circulation velocities and cardiac frequency. The results of the experiment confirm the value of such a position where the intention is to simulate the cardiovascular changes that occur during weightlessness. The results are in agreement with those of the different authors in both bedrest studies and immersion simulations.
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