Department of Neurology, Huashan Hospital, Fudan University, Shanghai, China.
Department of Rehabilitation Medicine, The Second Affiliated Hospital of Jiaxing University, Jiaxing, China.
Neural Plast. 2021 Mar 3;2021:8819169. doi: 10.1155/2021/8819169. eCollection 2021.
We studied the impact of vibratory stimulation on the electrophysiological features of digital sensory nerve action potential (SNAP).
The antidromic digit 3 SNAP was recorded in 19 healthy adults before, during, and after applying a vibration to either 3rd or 5th metacarpal phalangeal joint (MCPJ) at 60 Hz and amplitude of 2 mm. 100% supramaximal stimulus intensity was performed in 5 subjects (randomly selected from the 19 subjects) where the SNAP sizes were recorded.
The amplitude of digit 3 SNAP declined to 58.9 ± 8.6% when a vibration was applied to MCPJ digit 3. These impacts did not change by increasing the electrical stimulus intensity. The SNAP regained its baseline value immediately after the cessation of vibration stimulation. The magnitude of size reduction of digit 3 SNAP was less when vibration was moved to from MCPJ of digit 3 to MCPJ of digit 5. . The marked drop of the SNAP size during vibratory stimulation reflects the decreased responsiveness of A afferents to electrical stimulation, which deserve further investigation in the study of focal vibration in neurorehabilitation.
我们研究了振动刺激对数字感觉神经动作电位（SNAP）电生理特征的影响。
在 19 名健康成年人中，在对第 3 或第 5 掌指关节（MCPJ）施加 60Hz、2mm 振幅的振动之前、期间和之后，记录对向的第 3 指 SNAP。在 5 名受试者（从 19 名受试者中随机选择）中进行 100%最大刺激强度，记录 SNAP 大小。
当振动施加到 MCPJ 第 3 指时，第 3 指 SNAP 的振幅下降到 58.9±8.6%。这些影响不会因增加电刺激强度而改变。振动刺激停止后，SNAP 立即恢复基线值。当振动从第 3 指 MCPJ 移到第 5 指 MCPJ 时，第 3 指 SNAP 的大小减小幅度较小。在振动刺激过程中 SNAP 大小的明显下降反映了 A 传入纤维对电刺激的反应性降低，这在神经康复中对焦点振动的研究中值得进一步研究。
