HUMAN CARDIOVASCULAR AND VESTIBULAR RESPONSES IN LONG MINUTES AND LOW+GZ LOADING BY A SHORT ARM CENTRIFUGE

1.4 G, 1.7 G, and 2.0 G of +Gz and 60 minutes centrifugation was adopt ed to 20 healthy male subjects using 1.8 m radius centrifuge equipped to Nihon University School of Medicine. G was applied from lower G, co nsidering G training effect for the subjects. Effects on performance d ecline and side effects of such a short-arm centrifugation were especi ally observed in the experiments, because this size of centrifuge coul d be used in space station in future for a strong countermeasure of ca rdiovascular deconditioning, demineralization from bone, etc. G traini ng effect was observed same as higher and rapid G acceleration in figh ter pilot. Subjects suffered from many types of discomfort; such as se nsation of heaviness of diaphragm, cold sweat, nausea, irritable feeli ng, arrhythmia, tachycardia, rapid decrease of blood pressure, which s ometimes caused interruption of G load. As 2.0 G and 60 minutes centri fugation seemed very tough load to the subjects, there should be neces sary some G suit or other countermeasure, if we apply a higher G and/o r longer G duration. Performance decline due to the load commonly cont inued for 1 hour or so. Side effects were observed in relation to neur o-vestibular, cardio-vascular, and autonomic nervous system.