Hirvonen T P, Aalto H, Pyykkö I, Juhola M
Department of Otorhinolaryngology, University Central Hospital of Helsinki, Finland.
J Vestib Res. 1999;9(2):119-25.
The head autorotation test is a novel method for studying the high-frequency vestibuloocular reflex without heavy machinery to generate whole-body rotation. Despite many studies with the test, the method is far from standardized, and no comparison has been made of different versions of the test. The objective of this study was to compare the vestibuloocular reflex of 100 healthy subjects measured simultaneously with two versions of the head autorotation test. Gain, phase, asymmetry, and the frequency bands reached were determined in the frequency bands of 1, 2, 3, 4, and 5 Hz. The gain measured with both tests was close to unity (range 0.95-1.04) from 1 to 4 Hz and about 0.9 at 5 Hz. In the test developed by Vorteq the phase lagged (-7 to -21 degrees) in all the frequency bands, and it differed significantly from the phase lead of 2 to 5 degrees that was measured by the other test. The asymmetry measured with the Vorteq test increased continuously from 1.5% (1 Hz) to 5.7% (5 Hz). The results of the tests showed intersubject variation, which was larger in the higher frequency bands. In conclusion, the high-frequency vestibuloocular reflex of healthy subjects can be quantified with active head oscillation. Both tests produced similar gain results, but the phase results differed systematically. Thus, the results of different head autorotation tests may not be directly comparable.
头部自转试验是一种研究高频前庭眼反射的新方法，无需重型机械来产生全身旋转。尽管对该试验进行了许多研究，但该方法远未标准化，且尚未对不同版本的试验进行比较。本研究的目的是比较用两种版本的头部自转试验同时测量的100名健康受试者的前庭眼反射。在1、2、3、4和5赫兹的频段中确定增益、相位、不对称性和达到的频段。两种试验测量的增益在1至4赫兹时接近1（范围为0.95 - 1.04），在5赫兹时约为0.9。在Vorteq开发的试验中，相位在所有频段均滞后（-7至-21度），且与另一种试验测量的2至5度的相位超前有显著差异。用Vorteq试验测量的不对称性从1赫兹时的1.5%持续增加到5赫兹时的5.7%。试验结果显示受试者间存在差异，在较高频段差异更大。总之，健康受试者的高频前庭眼反射可用主动头部摆动来量化。两种试验产生了相似的增益结果，但相位结果存在系统性差异。因此，不同头部自转试验的结果可能无法直接比较。
