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  • Title: [Analysis of broadband sinusoidal harmonic acceleration test results for normal young people].
    Author: Wang W, Li SS, Chen TS, Xu KX, Han X, Liu Q, Wen C, Lin P.
    Journal: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi; 2020 May 07; 55(5):479-482. PubMed ID: 32842362.
    Abstract:
    Objective: We tested more frequency (0.01-3.0 Hz) of the sinusoidal harmonic acceleration test(SHAT) by the NKI rotation chair, aimed to analyze the results of the normal youth. Methods: Fifty normal young people were tested with sinusoidal harmonic acceleration by NKI rotation chair. Including 24 men and 26 women, aged from 20 to 40 years old, with median age of 27 years, with no vestibular dysfunction participated in the present study. All the volunteers accepted the sinusoidal harmonic acceleration test by the NKI rotation chair, the frequency included 0.01 Hz, 0.02 Hz, 0.03 Hz, 0.05 Hz, 0.1 Hz, 0.2 Hz, 0.3 Hz, 0.6 Hz, 1.0 Hz, 1.5 Hz, 2.0 Hz, 3.0 Hz. Taken the gain, phase, and asymmetry as the parameters, the trait of each frequency was analysed. Results: From 0.01 Hz to 1.5 Hz, the gain increased close to 1 gradually, and with fluctuates slightly at the 2.0 Hz and 3.0 Hz frequencies. The phase decreased as frequencies increased close to 0 at 0.3 Hz. The frequency above 0.6 Hz presented negative. Asymmetric values were distributed on both positive and negative sides at each frequency and were different from each other, both values were less than 20%. Conclusion: Broadband SHAT can accurately assess the horizontal semicircular canal function at different frequencies in a wider frequency range, and objectively, reflect the physiological function of the horizontal semicircular canal, and expand the clinical value of traditional SHAT. 目的： 分析健康青年人宽频（0.01~3.0 Hz）正弦谐波加速试验（sinusoidal harmonic acceleration test，SHAT）结果特点，探讨其临床价值。 方法： 50名健康青年志愿者，男24名、女26名，年龄20~40岁，中位年龄27岁。应用I-portal NOTC旋转椅系统（美国NKI）进行宽频SHAT（0.01、0.02、0.03、0.05、0.1、0.2、0.3、0.6、1.0、1.5、2.0、3.0 Hz），以各频率的增益、相位和非对称参数作为观测指标，分析各个频率的参数特征。 结果： 宽频SHAT的增益随着频率的增高逐渐增大，并在1.5 Hz最趋近于1，2.0 Hz和3.0 Hz的增益值略有波动；相位值随频率增高呈降低趋势，在0.3 Hz接近于0（即眼动相对于头动/转椅的延迟时间最短），并在0.6 Hz及以上频率出现负值；各频率的非对称值分布在左右两侧，且并不完全相同，但两侧值均<20%。 结论： 宽频SHAT能够在更宽频域内对健康青年人水平半规管功能进行不同频率的准确评估，客观反映水平半规管生理功能，拓展了传统SHAT的临床价值。.
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