Ritzmann Ramona, Krause Anne, Freyler Kathrin, Gollhofer Albert
Department of Sports and Sports Science, University of Freiburg, Schwarzwaldstraße 175, 79117 Freiburg, Germany.
Department of Sports and Sports Science, University of Freiburg, Schwarzwaldstraße 175, 79117 Freiburg, Germany.
Hum Mov Sci. 2018 Aug;60:191-201. doi: 10.1016/j.humov.2018.06.011. Epub 2018 Jun 26.
Based on previous evidence that whole-body vibration (WBV) affects pathways involved in disynaptic reciprocal inhibition (DRI), the present hypothesis-driven experiment aimed to assess the acute effects of WBV on DRI and co-contraction. DRI from ankle dorsiflexors to plantar flexors was investigated during submaximal dorsiflexion before and after 1 min of WBV. With electromyography, musculus soleus (SOL) H-reflex depression following a conditioning stimulation of the peroneal nerve (1.1x motor threshold for the musculus tibialis anterior, TA) was assessed and co-contraction was calculated. After WBV, DRI was significantly increased (+4%, p < 0.05). SOL (-13%, p < 0.05) and TA (-6%, p < 0.05) activities were significantly reduced; co-contraction tended to be diminished (-8%, p = 0.05). Dorsiflexion torque remained unchanged. After WBV, DRI increased during submaximal isometric contraction in healthy subjects. The simultaneous SOL relaxation and TA contraction indicate that a more economic movement execution is of functional significance for WBV application in clinical and athletic treatment.
基于先前的证据表明全身振动（WBV）会影响双突触交互抑制（DRI）所涉及的通路，本假设驱动实验旨在评估WBV对DRI和共同收缩的急性影响。在WBV 1分钟前后的次最大背屈过程中，研究了从踝背屈肌到跖屈肌的DRI。通过肌电图，评估了在腓总神经条件刺激（胫前肌，TA的1.1倍运动阈值）后比目鱼肌（SOL）H反射的抑制情况，并计算了共同收缩。WBV后，DRI显著增加（+4%，p<0.05）。SOL（-13%，p<0.05）和TA（-6%，p<0.05）的活动显著降低；共同收缩趋于减少（-8%，p=0.05）。背屈扭矩保持不变。在健康受试者中，WBV后次最大等长收缩期间DRI增加。SOL同时放松和TA收缩表明，更经济的运动执行对于WBV在临床和运动治疗中的应用具有功能意义。
