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Shift in arm-pointing movements during gravity changes produced by aircraft parabolic flight.

Authors
  • Chen, Y
  • Mori, S
  • Koga, K
  • Ohta, Y
  • Wada, Y
  • Tanaka, M
Type
Published Article
Journal
Uchū Seibutsu Kagaku
Publication Date
Jun 01, 1999
Volume
13
Issue
2
Pages
77–81
Identifiers
PMID: 11542494
Source
Medline
License
Unknown

Abstract

It has been shown that target-pointing arm movements without visual feedback shift downward in space microgravity and upward in centrifuge hypergravity. Under gravity changes in aircraft parabolic flight, however, arm movements have been reported shifting upward in hypergravity as well, but a downward shift under microgravity is contradicted. In order to explain this discrepancy, we reexamined the pointing movements using an experimental design which was different from prior ones. Arm-pointing movements were measured by goniometry around the shoulder joint of subjects with and without eyes closed or with a weight in the hand, during hyper- and microgravity in parabolic flight. Subjects were fastened securely to the seat with the neck fixed and the elbow maintained in an extended position, and the eyes were kept closed for a period of time before each episode of parabolic flight. Under these new conditions, the arm consistently shifted downward during microgravity and mostly upward during hypergravity, as expected. We concluded that arm-pointing deviation induced by parabolic flight could be also be valid for studying the mechanism underlying disorientation under varying gravity conditions.

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