Quantifying the importance of high frequency components on the amplitude of physiological tremor
Quantifying the importance of high frequency components on the amplitude of physiological tremor
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DOI：
10.1007/s00221-009-2132-7
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发表时间：
2010-04-01
影响因子：
2
通讯作者：
Duval, Christian
中科院分区：
文献类型：
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作者：
Carignan, Benoit;Daneault, Jean-Francois;Duval, Christian
本研究的目的是确定每个频率分量对总生理性震颤(PT)波幅的重要性。我们怀疑，由于高频PT的位移幅度较低，去除它们对PT幅度的影响很小，甚至没有影响。水平握住食指时，用激光位移传感器测量食指PT。用位移、速度和加速度计算震幅。同时计算五个频段的PT波幅。虽然7.5-12.5和16.5-30 Hz频段内振荡的位移幅度分别占PT总振荡幅度的24%和10%，但它们的去除使PT幅度降低了不到3%。相反，从PT信号中去除1-3.5赫兹范围内的振荡使原始PT信号的幅度在位移中减少56%。这表明，当要研究的任务涉及到震颤减少的测量时，重点应该放在1-3.5赫兹频段的振荡上。
The objective of this study was to determine the importance of every frequency component on total physiological tremor (PT) amplitude. We suspect that since high frequencies of PT are of lower amplitude in displacement, removing them will have little to no impact on PT amplitude. PT of the index finger was measured with a laser displacement sensor while the finger was held horizontally. Amplitude of tremor was calculated in displacement, velocity and acceleration. PT amplitude was also calculated within five frequency bands. Although displacement amplitude of oscillations within the 7.5-12.5 and 16.5-30 Hz frequency bands represent 24 and 10% of total PT oscillation amplitude, respectively, their removal reduced PT amplitude by less than 3%. Conversely, the removal of the oscillations within 1-3.5 Hz band from the PT signal reduced the amplitude of the original PT signal by 56% in displacement. This suggests that when a task to be studied involves the measurement of a reduction in tremor, focus should be on the oscillations in the 1-3.5 Hz band.