Koceja D M
Department of Kinesiology, Indiana University, Bloomington 47405, USA.
Electromyogr Clin Neurophysiol. 1995 Jan-Feb;35(1):25-30.
In an effort to investigate the interactions of the quadriceps and soleus muscles, the isometric force-time curve of the Achilles tendon-tap reflex (ATR) was measured in 10 college age subjects. The tendon-jerk was conditioned with a tap to the ipsilateral or contralateral patellar tendon, or by an electrocutaneous (3x perception) stimulus applied to the belly of the quadriceps. The conditioning stimulus preceded the test ATR by 25, 40, 55, 70, 85, 100, 115, 130 or 145 ms. The results indicated that the ipsilateral conditioning tendon-tap produced a wave of short-latency facilitation (40 ms) and long-latency inhibition (85-130 ms) to the triceps surae muscles. The ipsilateral cutaneous conditioning, however, did not alter reflex excitability. A contralateral conditioning to the patellar tendon again produced short-latency (50-70 ms) facilitation, whereas the electrocutaneous stimulus did not alter motoneuron excitability. Moreover, a barrage of electrocutaneous impulses to either the ipsilateral or contralateral quadriceps (1 minute/60 pps) did not significantly alter motoneuron excitability of the soleus muscle. These results indicate that motoneuron excitability changes are observed in the soleus muscle with mechanical conditioning but not with electrocutaneous conditioning. Several neurophysiological mechanisms are proposed to mediate these changes.
为了研究股四头肌和比目鱼肌之间的相互作用，对10名大学生进行了跟腱叩击反射（ATR）的等长力-时间曲线测量。通过叩击同侧或对侧髌腱，或通过施加于股四头肌肌腹的皮肤电刺激（3倍感知阈值）来对腱反射进行条件设定。条件刺激在测试ATR之前25、40、55、70、85、100、115、130或145毫秒施加。结果表明，同侧条件性腱叩击对小腿三头肌产生了一波短潜伏期易化（40毫秒）和长潜伏期抑制（85 - 130毫秒）。然而，同侧皮肤条件设定并未改变反射兴奋性。对髌腱的对侧条件设定再次产生了短潜伏期（50 - 70毫秒）易化，而皮肤电刺激并未改变运动神经元兴奋性。此外，对同侧或对侧股四头肌施加一连串皮肤电冲动（1分钟/60次/秒）并未显著改变比目鱼肌的运动神经元兴奋性。这些结果表明，在比目鱼肌中，机械性条件设定可观察到运动神经元兴奋性变化，而皮肤电条件设定则不然。提出了几种神经生理机制来介导这些变化。
