Symposium on the Role of the Vestibular Organs in Space Exploration (1970) / Chapter Skim
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THE SYMPTOMATOLOGY OF MOTION SICKNESS
THE SYMPTOMATOLOGY OF MOTION SICKNESS
Pages 89-100
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From page 89... ...
Symptoms arise as the result of failure to make adequate compensatory adjustments, as the result of inappropriate or incorrect adjustments and preparations, and as a result of the additional information-processing load imposed by incorrect perceptual data processing and the effort to correct it. Similar symptoms can be produced by bringing about these same conditions in various ways, other than by subjecting the victim to the motions typically associated with motion sickness.
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From page 90... ...
With the advent of laboratory interest in the condition, we acquired rotating chair sickness, Coriolis sickness, elevator sickness, swing sickness, and even Cinemascope sickness, 2-FH-2 Hoover simulator sickness, and still sickness. Motion sickness provides a pertinent and insightful name for the syndrome occurring under all of these circumstances.
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From page 91... ...
There can be no doubt that nausea often accompanies decreasing blood pressure and falling cardiac output from any cause. Whether or not this nausea is secondary to embarrassed cerebral circulation is less certain.
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From page 92... ...
The problem is made more difficult by the need to predict the inertial environment in order that intended movements and dynamic postural reflexes may be properly compensated in time to achieve their objectives. Correcting muscle tension after an arm or leg has been deflected by an improperly predicted force is not a satisfactory solution.
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From page 93... ...
Cardiovascular Factors Having described the manner in which muscle preparation for vigorous action can place additional loads on the cardiovascular system, I should like to examine the evidence that such a load does actually occur and that failure to adjust to it correlates highly with development of symptoms. The most severe motion-sickness symptoms seem to be caused by a decrease in circulating blood volume.
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From page 94... ...
It is not known for certain how decreased cardiac output and blood pressure produce nausea. There are several reasons to believe that it involves embarrassment of cerebral circulation and metabolism.
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From page 95... ...
Symposium on Motion Sickness, With Special Reference to Weightlessness, AMRL-TDR-63-25, Aerospace Medical Research Laboratories, Wright-Patterson Air Force Base, Ohio, June 1963, pp.
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From page 96... ...
Symposium on Motion Sickness. With Special Reference to Weightlessness, AMRI.-TDR-63-25, Aerospace Medical Research Laboratories, Wright-Patterson Air Force Base, Ohio, June 1963, pp.
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From page 97... ...
As I did mention, the decrease in blood sugar was reported as augmenting the symptoms, whereas an increase tended to reduce symptoms. Money: That explains the difference, because the negative report I saw compared two groups of subjects both of whom were exposed to motion.
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From page 98... ...
Is that right, or did I understand that you meant to say that vertigo accompanies the positional alcohol nystagmus, or do you feel th.it vertigo and positional alcohol nystagmus are quite separate? Johnson: I did not mean to say that the positional alcohol nystagmus causes nausea, although we all know that nausea can result from too much alcohol.
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From page 99... ...
Army Aeromedical Research Laboratory
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