Jaberzadeh Shapour, Zoghi Maryam, Morgan Prue, Storr Michael
Department of Physiotherapy, School of Primary Health Care, Monash University, Melbourne, Australia.
Rehabilitation Sciences Research Centre, University of Melbourne, Melbourne, Australia.
Basic Clin Neurosci. 2013 Summer;4(3):209-16.
IN THIS STUDY WE COMPARED TRANSCRANIAL MAGNETIC STIMULATION (TMS) ELICITED MOTOR EVOKED POTENTIALS (MEPS) IN A POSTURAL (BILATERAL LOW BACK EXTENSION: BLBE) and a respiratory (forced expiration during breath holding: FEBH) task.
Using TMS of the left motor cortex, simultaneous patterns of corticospinal facilitation of the contralateral erector spinae (ES) and rectus abdominis (RA) muscles during graded voluntary activation were compared in seven healthy subjects.
The facilitation pattern demonstrated task dependency by showing that MEP amplitudes in the ES muscle tended to be smaller at any given contraction level in the FEBH task than in the BLBE task.
The results suggested a linear-type relationship between the size of MEPs with increasing background contraction of ES and RA in the BLBE task. However, both muscles showed a plateau effect with higher background contractions (>50% of maximum) during the FEBH task. The varied response of ES and RA across these two tasks reinforces the importance of task specific training in clinical settings.
在本研究中，我们比较了在姿势任务（双侧下背部伸展：BLBE）和呼吸任务（屏气时用力呼气：FEBH）中经颅磁刺激（TMS）诱发的运动诱发电位（MEP）。
对七名健康受试者使用左侧运动皮层的TMS，比较在分级自主激活过程中对侧竖脊肌（ES）和腹直肌（RA）的皮质脊髓易化的同步模式。
易化模式显示出任务依赖性，表明在FEBH任务中，在任何给定收缩水平下，ES肌肉中的MEP振幅往往比在BLBE任务中更小。
结果表明，在BLBE任务中，随着ES和RA背景收缩增加，MEP大小之间呈线性关系。然而，在FEBH任务中，随着背景收缩增加（>最大收缩的50%），两块肌肉均表现出平台效应。ES和RA在这两项任务中的不同反应强化了临床环境中特定任务训练的重要性。
