A predictive test for space motion sickness.

C H Markham; S G Diamond

Home/Archive/PubMed

PubMed · 8275263

A predictive test for space motion sickness.

C H Markham·S G Diamond

View original source ↗Export metadata ↓

Abstract

Eye torsion was examined in 13 astronaut subjects, tested during repeated episodes of 0 G and 1.8 G in parabolic flight aboard NASA's KC-135. Four findings are included. 1) A strong relationship between previous history of SMS and ocular torsional disconjugacy in novel gravitational states. 2) Responses were unchanged in 4 subjects retested a year later. 3) Ocular torsional disconjugacy scores increased as exposure to 0 and 1.8 G increased. This was particularly evident in subjects who had had SMS. 4) Torsional studies during 10 to 20 parabolas are required to accurately predict SMS. The hypothesis of otolith asymmetry, compensated in 1 G but becoming unmasked in novel gravitational states, is proposed to explain the torsional disconjugacy and ensuing SMS.

Explore related subjects

Eye Diseases Eye Movements Gravitation Humans Motion Sickness Space Flight Torsion Abnormality Vestibular Diseases Journal Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

C H Markham, S G Diamond. 1993. A predictive test for space motion sickness.. https://pubmed.ncbi.nlm.nih.gov/8275263/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2001

[Neuroradiological methods in ophthalmology].

Explore the source record for details and available documents.

Eye Diseases↗

PubMed2001

[Choice of neuroradiological methods in ophthalmology--the eye and the lacrimal apparatus].

With improved imaging methods, the possibility of demonstrating pathological changes in the visual pathways has increased substantially. However, optimal evaluation of visual disorders requires familiarity with the anatomy and pathology of the visual pathways, and with the many advances in neuroimaging. The purpose of this article is to provide clinicians with a practical approach for selecting the most appropriate imaging modalities. Choice of technique is discussed with reference to anatomical regions rather than a complete list of diseases. Ophthalmoscopy reveals many intraocular abnormalities. Imaging studies help in cases where opaque media preclude a view of the fundus. In addition, imaging studies assist in confirming the extraocular extent of the lesion. The advantages and disadvantages of x-ray, computed tomography and magnetic resonance imaging are discussed and illustrated by examples.

Eye Diseases↗

PubMed2001

[Choice of neuroradiological methods in ophthalmology--the optic nerve, muscles of the eye and orbit].

Optimal imaging of the orbital structures presents a challenge. Images of this region may be disturbed by ocular movements, and orbital fat may prevent visualisation of the optic nerve and retrobulbar lesions. In this article, we intend to provide practical guidelines for the evaluation of orbital abnormalities, on the basis of our own experiences and a study of selected literature. Computed tomography (CT) and magnetic resonance imaging (MRI) are both useful for the detection and characterisation of orbital abnormality. However, for diagnostic work-up of the optic nerves, contrast-enhanced, fat-suppressed MRI best demonstrates the pattern and severity of optic nerve abnormality and allows assessment of the intracranial part of the optic nerves and associated intracranial abnormality. In the case of bony involvement, spiral CT imaging is the modality of choice. It is quick, inexpensive and allows multiplanar reconstruction. Not uncommonly, CT as well as MRI may be needed to characterise an orbital lesion.

Eye Diseases↗