Changes in Saccadic Reaction Time while Maintaining Neck Flexion in the Elderly
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概要
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We investigated changes in saccadic reaction time during maintenance of neck flexion in elderly individuals. Subjects comprised 49 volunteers, including 19 young adults and 30 elderly adults. Elderly subjects were separated into 2 groups (trained group: n=18; untrained group: n=12) based on responses to a questionnaire concerning activities of daily living. Saccadic reaction time was measured at angles of neck flexion of 0°(resting position), 10°and 20°, with the chin either resting on a stand (chin-on) or not (chin-off). Reaction time was determined as the latency to the beginning of eye movement toward the lateral target, which was moved at random intervals in jumps of 20°amplitude. In the chin-on posture, the angle of neck flexion had no significant effect on reaction time in any group. In the chin-off posture, the flexion angle significantly affected reaction time in both young and elderly trained groups. Significant shortenings of the reaction time were obtained at 10°and 20°neck flexion in the young group, and at 20°neck flexion in the elderly trained group. No significant shortening of reaction time was noted in the elderly untrained group. These findings suggest that neural function associated with shortening of saccadic reaction time due to neck extensor activity decreases with age, and the decrements become more marked with inactivity in daily life.
- 日本生理人類学会の論文
著者
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Fujiwara Katsuo
Dep. Of Human Movement And Health Graduate School Of Medical Sci. Kanazawa Univ.
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Fujiwara Katsuo
Department Of Health And Physical Education College Of Liberal Arts Kanazawa University
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Kunita Kenji
Research Center for Urban Health and Sports, Osaka City University
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Kunita Kenji
Research Center For Urban Health And Sports Osaka City University
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