Ocular torsion before and after 1 hour centrifugation
article
To assess a possible otolith contribution to effects observed following prolonged expo-sure to hyper gravity, we used video-oculography to measure ocular torsion during static and dynamic conditions of lateral body tilt (roll) before and after one hour of centrifugation with a Gx-load of 3G. Static tilt (from 0 to 57 deg. to either side) showed a 10% decrease in otolith induced ocular torsion after centrifugation. This implies a reduced gain of the otolith function. The dynamic condition consisted of sinusoidal body roll (frequency 0.25 Hz, amplitude 45 deg.) about an earth horizontal and about an earth vertical axis (respectively, "with" and "without" otolith stimulation). Before centrifugation the gain of the slow component velocity (SCV) was significantly lower "with" otolith stimulation than "without" otolith stimulation. Apparently, the contribu-tion of the otoliths counteracts the ocular torsion response generated by the semicircular canals. Therefore, the observed increase in SCV gain in the condition "with" otolith stimulation after centrifugation, seems in correspondence with the decreased otolith gain in the static condition.
Topics
AdaptationHypergravityOtolithsVestibulo-ocular reflexadaptationadultcentrifugationconference papercontrolled studyeye movementfemalegravityhumanhuman experimentmalenormal humanoculographyotolithpriority journalsemicircular canaltorsionvestibuloocular reflexAdultCentrifugationEye MovementsFemaleHumansMaleOtolithic MembraneTorsion
TNO Identifier
8610
Source
Brain Research Bulletin, 40(5-6), pp. 331 - 333.
Pages
331 - 333
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