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Results for “Coriolis Force”

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At least 19 recordsLinked to original sources
PubMedDate not supplied

[Model of motion sickness in dogs for assessing the effectiveness of pharmacological substances].

The paper describes a model of motion sickness for dogs. The method is based on the simultaneous use of vertical and rotatory movement of the device with a continuously varying angular velocity of rotation to generate Coriolis acceleration. The exposure increases significantly the number of sick animals to be used in the selection of antimotion drugs. Diphenidol, marezine, tigane, bromotigane and metachloropromide were tested. Diphenidol and to a lesser extent marezine and metachloropromide proved effective. Tigane and bromotigane were ineffective against motion sickness.

Animals↗
PubMedDate not supplied

[Cardiovascular reactions in orthostatic tests and human resistence to vestibular stimuli].

The paper discusses the relationship between the vestibular stability of man and his cardiovascular regulation that develops during the recumbent-to-upright change of the body position. It describes specific parameters typical of the intermediate processes of the cardiovascular system that are prognostically important for the evaluation of the vestibular stability. The paper gives equations of multiple regression helping to predict the level of vestibular resistance with respect to the pattern of intermediate processes of the cardiovascular system during orthostatic tests.

Adolescent↗
PubMed1978

Coriolis cross-coupling effects: disorienting and nauseogenic or not?

Nausea and disorientation are sometimes produced by head movements during turning maneuvers in aircraft. These responses are usually attributed to Coriolis cross-coupling stimulation of the vestibular system, although it has been indicated recently that many turning maneuvers of aircraft have insufficient angular velocity to generate such effects. The purpose of the present study was to further distinguish conditions in which Coriolis cross-coupling effects are disorienting and nauseogenic from conditions in which they are neither.

Adult↗
PubMed1978

Visual counteraction on nauseogenic and disorienting effects of some whole-body motions: a proposed mechanism.

It has been indicated that the nauseogenic and disorienting effects of several kinds of provocative motion stimuli can be ameliorated by visual reference to the Earth. The purpose of the present experiment is to investigate a hypothesis concerning the mechanism of this beneficial effect. The results demonstrate that the aftereffects of large-field optokinetic stimulation can nullify the nauseogenic and disorienting effects of Coriolis cross-coupled vestibular stimuli. It is hypothesized that large-field optokinetic stimulation in a particular head plane modifies activity in the vestibular nuclei as though the semicircular canals in that plane had been stimulated. A previous study illustrated that such semicircular canal stimulation would completely nullify the disturbing and disorienting effects of Coriolis cross-coupled stimulation according to theoretical expectations. The results provide inferential support for the hypothesis and suggest that predictability of disorientation and nauseogenic disturbance is reasonably well handled by current theory when the conditions of motion are fairly well specified.

Adult↗
PubMedDate not supplied

[Human visual functions during mild vestibular exposures].

Human experiments have shown that after mild stimulation of semi-circular receptors, which induces no motion sickness symptoms, the time of recovery of the central vision acuity shortens and after stimulation of otolith receptors tends to increase. Thresholds of color discrimination as applied to the red, green and violet colours as well as the course of back adaptation after mild stimulation of otolith receptors remain unchanged. The time of appearance of the Purkinje phenomenon after stimulation of receptors of semi-circular canals often remains unaltered and sometimes increases. It is assumed that the visual fixation of objects occurring with the time deficiency as related to the object display is accompanied by a compensatory-adaptive increase in the resolution capacity of the visual system.

Adult↗
PubMedDate not supplied

Vestibular nystagmus under hyperbaric conditions.

Sixty subjects participated in 454 experiments, 94 of which involved a centrifuge and an overload of 2 units. The studies showed that otolithic stimulation (the 2 unit overload) either activated nystagmus or had no substantial effect on the magnitude of this property. The paper advances a new, supplementary method for individual evaluation of the functional state of the vestibular analyzer of a pilot, in complicated cases of vestibulometry in clinical examinations, by comparative evaluation of the intensity of the nystagmic response under normal and hyperbaric conditions. Patients in whom the nystagmic slow phase speed (SPS) during hyperbaria (2 units) exceeds its usual value are designated as vestibulo-resistant; persons in whom the SPS of the nystagmus does not change substantially during hyperbaria are designated as vestibulo-susceptible.

Acceleration↗