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cVEMP morphology changes with recording electrode position, but single motor unit activity remains constant

機譯：cVEMP形態(tài)隨記錄電極位置的變化而變化，但單個電機單元的活動保持恒定

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Cervical vestibular evoked myogenic potentials (cVEMPs) recorded over the lower quarter of the sternocleidomastoid (SCM) muscle in normal subjects may have opposite polarity to those recorded over the midpoint. It has thus been suggested that vestibular projections to the lower part of SCM might be excitatory rather than inhibitory. We tested the hypothesis that the SCM muscle receives both inhibitory and excitatory vestibular inputs. We recorded cVEMPs in 10 normal subjects with surface electrodes placed at multiple sites along the anterior (sternal) component of the SCM muscle. We compared several reference sites: sternum, ipsilateral and contralateral earlobes, and contralateral wrist. In five subjects, single motor unit responses were recorded at the upper, middle, and lower parts of the SCM muscle using concentric needle electrodes. The surface cVEMP had the typical positive-negative polarity at the midpoint of the SCM muscle. In all subjects, as the recording electrode was moved toward each insertion point, p13 amplitude became smaller and p13 latency increased, then the polarity inverted to a negative-positive waveform (n1-p1). Changing the reference site did not affect reflex polarity. There was a significant short-latency change in activity in 61/63 single motor units, and in each case this was a decrease or gap in firing, indicating an inhibitory reflex. Single motor unit recordings showed that the reflex was inhibitory along the entire SCM muscle. The cVEMP surface waveform inversion near the mastoid and sternal insertion points likely reflects volume conduction of the potential occurring with increasing distance from the motor point.
機譯：在正常受試者中，在胸鎖乳突肌（SCM）肌肉的下四分之一處記錄的頸前庭誘發(fā)肌原性電位（cVEMP）可能與在中點處記錄的相反。因此，有人提出，前庭投射到SCM的下部可能是興奮性的而不是抑制性的。我們測試了SCM肌肉接受抑制性和興奮性前庭輸入的假設。我們記錄了10名正常受試者的cVEMP，其表面電極沿著SCM肌肉的前（胸骨）部分放置在多個位置。我們比較了幾個參考部位：胸骨，同側和對側耳垂以及對側腕部。在五名受試者中，使用同心針電極在SCM肌肉的上部，中部和下部記錄了單個運動單位的反應。表面cVEMP在SCM肌肉的中點具有典型的正負極性。在所有對象中，隨著記錄電極移向每個插入點，p13振幅變小，p13延遲增加，然后極性反轉為負-正波形（n1-p1）。更改參考部位不會影響反射極性。在61/63個單運動單元中，活動的短時延發(fā)生了顯著變化，在每種情況下，這是射擊的減少或間隙，表明存在抑制性反射。單個運動單位的記錄顯示，反射在整個SCM肌肉上都具有抑制作用。乳突和胸骨插入點附近的cVEMP表面波形反轉可能反映了隨著距運動點距離的增加而發(fā)生的電位的體積傳導。

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