CARDIOVASCULAR-RESPONSES TO KC-135 HYPER-GRAVITY

The present study was designed with two intentions; Are the effects of angular velocity detectable in the cardiovascular responses during th e hyper-G? Another is object to examine how the otolith signal could m odify the cardiovascular responses provoked by the exposure to the hyp er-G. NASA/KC-135 hyper-gravity flight was used to generate high gravi to-inertial forces to exclude a possible effect of angular velocity. S ix healthy subjects was indicated to make dorsal flexion of the neck t o reduce the otolith input. An exposure to +1.8Gz stress resulted in a remarkable increase of systolic and diastolic blood pressure, thereby pulse pressure became a little bit narrower. R-R interval revealed a tachycardia during the hyper-G except one subject. The present experim ent bore the similar cardiovascular responses as those observed in the previous studies with a short rotating radius, suggesting that almost no effect of angular velocity acts on their responses. A weaker otoli th input could possibly work on them. However a systematical observati on can not recognize among the subjects for the vestibular effect on t he cardiovascular responses. This fact of vestibular qualification lea ds us to speculate that it would depend on the subjects or other facto rs.