Krause A, Gollhofer A, Freyler K, Jablonka L, Ritzmann R
Department of Sport Science, University of Freiburg, Freiburg, Germany.
J Musculoskelet Neuronal Interact. 2016 Dec 14;16(4):327-338.
The objective of this study was to investigate neural effects of acute whole body vibration (WBV) on lower limb muscles regarding corticospinal and spinal excitability.
In 44 healthy subjects (16 f/ 28 m), motor evoked potentials (MEP) and H-reflexes in m. soleus (SOL) and gastrocnemius medialis (GM) were elicited before (t), immediately after (t), 2 (t), 4 (t) and 10 min after (t) WBV.
After WBV, MEP amplitudes were significantly increased in SOL (t+15±30%, t+22±32%, t+15±35%, t+20±30%, P<0.05), but not in GM (t+32±62%, t+9±35%, t+8±36%, t+22±47%; P=0.07). Contrarily, H-reflexes were significantly reduced in SOL (t-19±28%, t-21±22%, t-20±21%, t-14±28%, P<0.05) and GM (t-14±37%, t-16±25%, t-18±29%, t-16±28%, P<0.05).
A temporary sustained enhancement of corticospinal excitability concomitant with spinal inhibition after WBV points towards persisting neural modulation in the central nervous system. This could indicate greater neural modulation over M1 and descending pathways, while the contribution of spinal pathways is reduced.
本研究旨在探讨急性全身振动（WBV）对下肢肌肉皮质脊髓和脊髓兴奋性的神经影响。
在44名健康受试者（16名女性/28名男性）中，在全身振动前（t）、振动后即刻（t）、振动后2分钟（t）、4分钟（t）和10分钟（t）引出比目鱼肌（SOL）和腓肠肌内侧头（GM）的运动诱发电位（MEP）和Hoffmann反射（H反射）。
全身振动后，比目鱼肌的运动诱发电位幅度显著增加（t+15±30%，t+22±32%，t+15±35%，t+20±30%，P<0.05），而腓肠肌内侧头则未增加（t+32±62%，t+9±35%，t+8±36%，t+22±47%；P=0.07）。相反，比目鱼肌和腓肠肌内侧头的H反射显著降低（比目鱼肌：t-19±28%，t-21±22%，t-20±21%，t-14±28%，P<0.05；腓肠肌内侧头：t-14±37%，t-16±25%，t-18±29%，t-16±28%，P<0.05）。
全身振动后皮质脊髓兴奋性的暂时持续增强与脊髓抑制同时出现，表明中枢神经系统存在持续的神经调节。这可能表明对初级运动皮层（M1）和下行通路的神经调节增强，而脊髓通路的作用减弱。
