| Project/Area Number |
10671617
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Otorhinolaryngology
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| Research Institution | THE JIKEI UNIVERSITY SCHOOL OF MEDICINE |
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Principal Investigator |
YASHIRO Toshinobu UNIVERSITY SCHOOL OF MEDICINE OF JIKEI ・ OTOLARYNGOLOGY LECTURER, 医学部, 講師 (20200488)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Shigeru THE JIKEI UNIVERSITY SCHOOL OF MEDICINE・ OTOLARYNGOLOGY, ASSISTANT, 医学部, 助手 (90266700)
KOBAYASHI Naoki THE JIKEI UNIVERSITY SCHOOL OF MEDICINE・ OTOLARYNGOLOGY, ASSISTANT, 医学部, 助手 (80256320)
KANETA Kensaku THE JIKEI UNIVERSITY SCHOOL OF MEDICINE・ OTOLARYNGOLOGY, ASSISTANT, 医学部, 助手 (90194927)
NAKAMURA Masahiro THE JIKEI UNIVERSITY SCHOOL OF MEDICINE・ OTOLARYNGOLOGY, ASSISTANT, 医学部, 助手 (40297411)
SOEDA Kazuhiro THE JIKEI UNIVERSITY SCHOOL OF MEDICINE・ OTOLARYNGOLOGY, ASSISTANT, 医学部, 助手 (50256400)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | OTOLITH / DYNAMIC EQUIBRIUM FUNCTION / HEAD STABILITY / LINEAR ACCELERATION / POSTURE CONTROL / 直線加速度負荷 / 平衡機能 / 適応 |
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| Research Abstract |
The linear acceleration loading apparatus installed at the Tsukuba Space Center was employed. One cycle of linear acceleration loading lasted 4 sec (64 cm), and the subjects underwent 128 cycles. The loading was applied along the X and Y axes with the subject in the sitting position, and along the Y and Z axes with the subject in the dorsal position. These directions were decided so that the linear acceleration loading would be applied anteroposteriorly (i.e., along the X axis in the sitting position), left-right (i.e., along the Y axis in both the sitting and dorsal positions), and superiorly-inferiorly (i.e., along the Z axis in the dorsal position) in relation to the body axis. Foot pressure sensors were attached to the subjcts so that the gait function could be measured, while magnetic sensors were used to accurately measure the position of the head. In addition, three-dimensional image analysis and the Equi Test were employed to evaluate the dynamic balance function of the subject
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s.
When the otolith was stimulated by linear acceleration loading, especially along the Y axis in the sitting position, the posture and head axis became unstable. This finding indicated that the utricle of the otolith is deeply involved in posture control, including that relating to the head and the gait. Immediately after application of the linear acceleration loading, the spatial orientation in the direction of the gravitational axis showed a clear increase in recognition errors when the loading was applied along the Y axis in the sitting position and along the Y and Z axes in the dorsal position.
These results showed that the otolith is deeply involved in posture control, including in relation to the head and the gait. Further analysis revealed that the otolith is also involved in spatial orientation in the direction of the gravitational axis. These findings thus indicate the possibility that the otolith sends information regarding the gravitational direction to the central nervous system. Less
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