頚部前屈位での頚筋の筋活動量と眼球運動反応時間との関係

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This study investigated the relationship between the muscle activity of the neck and the reaction time of eye movement (RTEM) during neck flexion. This study consisted of two experiments: (1) the relationship between RTEM and the angle of necl flexion with the condition that the chin was placed or was not placed on a fixed stand, and (2) the relationship between RTEM and muscle activity of the neck extensor muscles under hanging weight so as to increase the moment around the joints of neck. Seven male subjects, aged 23 to 28 years, sat on a chair and the trunk was stabilized. The angle of neck flexion, which is defined as the angle between perpendicular line and tragusacromion line, was established using an angular detector with the baseline angle (0°) being the angle between both lines at rest. The subjects were instructed to pursue a light target which moved horizontally and tectangularly with an amplitude of 10° for a random duration of 1-3 seconds; (1) while maintaining the angle of neck flexion at 10° and 20° under the condition that the chin was placed or was not placed on a fixed stand, and (2) while maintaining the neck at 20° with hanging the weights ranging from ten per cent to 50% of the maximal strength of the neck extensor muscles. Analysis items were RTEM and the relative muscle activity (RMA) of the upper trapezius muscle. The results were as follows: 1) When the chin was not placed on the placed on the fixed stand, RTEM shortened and RAM increased as the angle of neck flexion increased. However, when the chin was placed on the fixed stand, RTEM and RMA did not change at any angle. These results suggest that RTEM is shortened not by the changes in the engle of neck flexion but by the physiological factors accompanying the increase of muscular action of the neck extensor muscles. 2) The relationship between mean RTEM and mean RMA showed that RTEM was similarly reduced between approximately 5% and 20% compared with that in the quiet posture, but was prolonged by approximately 30% RMA causing the smallest RTEM ranged from 2.5% to 22.4% in each subject. These results suggest that RTEM is reduced when the muscular action of the neck extensor muscles increased somewhat, that subject-to-subject variance is relatively large, and that the mechanism which prevents the reduction of RTEM operates when muscle activity is above the optimal RMA.
日本運動生理学会の論文
1995-01-31

頚部前屈位での頚筋の筋活動量と眼球運動反応時間との関係

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