Saccadic reaction times during isometric voluntary contraction of the shoulder girdle elevators and vibration stimulation to the trapezius
Saccadic reaction times during isometric voluntary contraction of the shoulder girdle elevators and vibration stimulation to the trapezius
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DOI：
10.1007/s004210100509
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发表时间：
2001-10-01
影响因子：
3
通讯作者：
Miyaguchi, A
中科院分区：
文献类型：
--
作者：
Fujiwara, K;Kunita, K;Miyaguchi, A
我们调查了肩带提升器的肌肉传入信息增加对眼跳反应时间的影响。在肩带提升器等长自主收缩和斜方肌振动刺激的条件下测量眼跳反应时间。扫视反应时间被定义为眼球开始向外侧目标移动的潜伏期，该目标以随机的时间间隔以20度的幅度跳跃移动。用眼电技术测量眼球运动。肌肉收缩力从最大自主收缩(MVC)的0%到30%以10%的增量设置，振动频率保持在100 Hz。在自主收缩条件下，眼跳反应时间逐渐缩短，最高可达30%MVC。在0%MVC的振动刺激下，反应时缩短程度与30%MVC的自主收缩时相同。在振动刺激和自主收缩相结合的条件下，反应时间与这些值基本相同；即没有发现在缩短反应时间方面存在相加效应。结果表明，随着伸颈肌肉传入信息的增加，眼跳反应时间显著缩短。我们已经讨论了没有相加效应的原因和限制反应时间缩短的因素。
We investigated the effect of increases in muscle afferent information from the shoulder girdle elevators on saccadic reaction time. Saccadic reaction time was measured under conditions of isometric voluntary contraction of the shoulder girdle elevators and vibratory stimulation of the trapezius. Saccadic reaction time was defined as the latency until the beginning of eye movement toward the lateral target, which was moved at random time-intervals in jumps of 20 degrees amplitude. Eye movement was measured using the electro-oculogram technique. Muscle contraction force was set in 10% increments from 0% to 30% of maximal voluntary contraction (MVC), and vibration frequency was maintained at 100 Hz. Under voluntary contraction, the saccadic reaction time gradually shortened up to 30% MVC. Under vibration stimulation at 0% MVC, the reaction time shortened to the same degree as that under voluntary contraction at 30% MVC. Under conditions of combined vibratory stimulation and voluntary contraction, the reaction time was essentially identical to these values; namely, no additive effect in shortening of the reaction time was recognized. The results demonstrated that saccadic reaction times were remarkably shortened by increases in muscle afferent information from the neck extensors. We have discussed reasons for the lack of an additive effect and factors limiting shortening of reaction times.