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.