Centre for Physical Activity and Nutrition Research, School of Exercise and Nutrition Sciences, Deakin University, Melbourne, Australia.
Muscle Nerve. 2012 Sep;46(3):384-93. doi: 10.1002/mus.23316.
We used transcranial magnetic stimulation (TMS) to investigate 3 weeks of unilateral leg strength training on ipsilateral motor cortex (iM1) excitability, and short-latency intracortical inhibition (SICI).
Right leg dominant participants (n = 14) were randomly divided into either a strength training (ST) or control group. The ST group completed 9 training sessions (4 sets of 6 to 8 repetitions of single right leg squats).
We observed a 41% increase in right leg strength, and a 35% increase in strength of the untrained left leg (P < 0.01). There was a significant increase in motor evoked potential (MEP) amplitude recruitment curve for the untrained left leg (P < 0.01). SICI of the iM1 decreased by 21% for the untrained left leg (P < 0.01).
The findings provide evidence for corticomotor adaptation for unilateral leg strength training within the iM1 that is modulated by changes in interhemispheric inhibition.
我们使用经颅磁刺激（TMS）研究了单侧腿部力量训练对同侧运动皮层（iM1）兴奋性和短潜伏期皮质内抑制（SICI）的影响，持续 3 周。
右利手参与者（n=14）被随机分为力量训练（ST）组或对照组。ST 组完成 9 次训练（4 组，每组 6-8 次右腿单腿深蹲）。
我们观察到右腿力量增加了 41%，未训练的左腿力量增加了 35%（P<0.01）。未训练的左腿运动诱发电位（MEP）振幅募集曲线显著增加（P<0.01）。未训练的左腿 iM1 的 SICI 降低了 21%（P<0.01）。
这些发现为单侧腿部力量训练在 iM1 内引起的运动皮质适应提供了证据，这种适应受大脑两半球抑制变化的调节。
