Grossman G E, Leigh R J, Abel L A, Lanska D J, Thurston S E
Department of Neurology, University Hospitals of Cleveland, Case Western Reserve University, OH 44106.
Exp Brain Res. 1988;70(3):470-6. doi: 10.1007/BF00247595.
We used the magnetic search coil technique to record horizontal (yaw) and vertical (pitch) head rotations of 20 normal subjects during (1) walking in place, (2) running in place, (3) vigorous, voluntary, horizontal head rotation and (4) vigorous, voluntary, vertical head rotation. During walking or running, the predominant frequency of pitch rotations was at least twice that of yaw rotations. During running, the median, predominant pitch frequency from all subjects was 3.2 Hz, but significant harmonics were present up to 15-20 Hz in several subjects. Group median maximal head velocity during walking or running did not exceed 90 degrees/second. During vigorous, voluntary head rotations median frequency for yaw and pitch was similar and did not exceed 2.6 Hz. However, group median maximal head velocity during vigorous voluntary yaw rotation was 780 degrees/second. Thus, (1) during locomotion, the head is stabilized in space incompletely but adequately so that the vestibulo-ocular reflex (VOR) is not saturated, (2) during vigorous, voluntary head rotations, the maximum head velocity exceeds the range where the VOR can stabilize gaze, (3) the frequencies of head rotations that occur during locomotion greatly exceed frequencies conventionally used in the laboratory for testing the VOR.
我们使用磁搜索线圈技术记录了20名正常受试者在以下情况下的水平（偏航）和垂直（俯仰）头部转动：（1）原地行走，（2）原地跑步，（3）剧烈、自主的水平头部转动，以及（4）剧烈、自主的垂直头部转动。在行走或跑步过程中，俯仰转动的主要频率至少是偏航转动频率的两倍。在跑步过程中，所有受试者的俯仰频率中位数为3.2赫兹，但在几名受试者中，高达15 - 20赫兹的显著谐波也存在。行走或跑步过程中，组中位数最大头部速度不超过90度/秒。在剧烈、自主的头部转动过程中，偏航和俯仰的频率中位数相似，且不超过2.6赫兹。然而，在剧烈自主偏航转动过程中，组中位数最大头部速度为780度/秒。因此，（1）在运动过程中，头部在空间中未完全但充分地稳定，使得前庭眼反射（VOR）未饱和；（2）在剧烈、自主的头部转动过程中，最大头部速度超过了VOR能够稳定注视的范围；（3）运动过程中发生的头部转动频率大大超过了实验室中传统用于测试VOR的频率。
