Höllge J, Kunkel M, Ziemann U, Tergau F, Geese R, Reimers C D
Department of Clinical Neurophysiology, Georg-August-University, Göttingen, Germany.
Int J Sports Med. 1997 Nov;18(8):614-7. doi: 10.1055/s-2007-972691.
Previous transcranial magnetic stimulation (TMS) studies showed exercise-induced depression of motor evoked potentials (MEP). The purpose of the present study was to evaluate changes in MEP size and central motor conduction time (CMCT) after various kinds of exercise of daily life and sports. Changes of both central and peripheral motor conduction were recorded immediately after predominantly aerobic (climbing stairs and jogging) and anaerobic (press-ups, dumb-bell holding, and 400 m-run) exercise. Strength exercise resulted in a significant decrease of MEP amplitudes. Exhausting press-ups reduced the mean MEP amplitude by 33% as compared to pre-exercise value, exhausting dumb-bell holding reduced the mean MEP amplitude by 66%. Aerobic exercises (climbing 600 steps and jogging 50 minutes) did not significantly change MEP amplitudes. The compound motor action potentials (registered after supramaximal peripheral electrical stimulation) remained unchanged after each paradigm. CMCT was not significantly altered by any of the exercises under investigation. Peripheral motor conduction time (PMCT) was slightly lengthened by 4% after isometric dumb-bell holding. PMCT and total motor conduction time were decreased after aerobic exercises, probably due to an increase of temperature of the lower extremities. In conclusion, TMS is a suitable technique for objective evaluation of central fatigue. The present study is the first to show its possible use in sports medicine, indicating that only exhaustive or strength exercises result in reduced MEPs.
以往的经颅磁刺激（TMS）研究表明，运动可导致运动诱发电位（MEP）降低。本研究的目的是评估日常生活中的各种运动和体育锻炼后MEP大小及中枢运动传导时间（CMCT）的变化。在主要进行有氧运动（爬楼梯和慢跑）和无氧运动（俯卧撑、握哑铃和400米跑）后，立即记录中枢和外周运动传导的变化。力量训练导致MEP波幅显著降低。与运动前相比，力竭性俯卧撑使平均MEP波幅降低了33%，力竭性握哑铃使平均MEP波幅降低了66%。有氧运动（爬600级台阶和慢跑50分钟）并未显著改变MEP波幅。每种运动模式后，复合肌肉动作电位（在超强外周电刺激后记录）均保持不变。所研究的任何一种运动均未显著改变CMCT。等长握哑铃后，外周运动传导时间（PMCT）略有延长4%。有氧运动后，PMCT和总运动传导时间缩短，这可能是由于下肢温度升高所致。总之，TMS是客观评估中枢疲劳的一种合适技术。本研究首次表明其在运动医学中的可能用途，表明只有力竭性或力量训练才会导致MEP降低。
