Effect of volitional relaxation and motor imagery on F wave and MEP: Do these tasks affect excitability of the spinal or cortical motor neurons?

被引:19
作者
Fujisawa, R. [1 ,6 ]
Kimura, J. [2 ]
Taniguchi, S. [1 ]
Ichikawa, H. [3 ]
Hara, M. [4 ]
Shimizu, H. [5 ]
Iida, H. [6 ]
Yamada, T. [2 ]
Tani, T. [1 ]
机构
[1] Kochi Med Sch, Dept Orthopaed Surg, Nankoku, Kochi 7838505, Japan
[2] Univ Iowa, Coll Med, Dept Neurol, Div Clin Electrophysiol, Iowa City, IA 52242 USA
[3] Showa Univ, Dept Neurol, Sch Med, Shinagawa Ku, Tokyo 1428666, Japan
[4] Teikyo Univ, Dept Rehabil Med, Sch Med, Itabashi Ku, Tokyo 1738606, Japan
[5] Tohoku Univ Hosp, Dept Neurol, Aoba Ku, Sendai, Miyagi 9808574, Japan
[6] Kansai Med Univ, Dept Orthopaed Surg, Moriguchi, Osaka 5708506, Japan
关键词
F wave; MEP; Anterior horn cell; Motor neuron excitability; Motor imagery; Volitional relaxation; TRANSCRANIAL MAGNETIC STIMULATION; REST-INDUCED SUPPRESSION; EVOKED-POTENTIALS MEPS; HORN CELL EXCITABILITY; CORTICOSPINAL EXCITABILITY; CORTEX EXCITABILITY; H-REFLEXES; IMMOBILIZATION; CONTRACTION; PERFORMANCE;
D O I
10.1016/j.clinph.2010.12.041
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Objective: To test if simple motor imagery, like thumb abduction, preferentially influences the excitability of the spinal or cortical motoneurons. Methods: Ten healthy subjects underwent two separate experiments, each consisting of recording F waves and MEPs from abductor pollicis brevis (APB) in three consecutive sessions: (1) baseline, (2) after immobilizing APB for 3 h, and (3) after brief muscle exercise. During the immobilization, the subjects were instructed to volitionally relax APB in experiment 1 (relaxation task), and mentally simulate thumb abduction without actual movement in experiment 2 (imagery task). Results: Relaxation task suppressed both MEPs and F waves. Motor imagery reduced this suppression, restoring F waves nearly completely (94%) and MEPs only partially (77%). Hence, the rest-induced decline of MEPs in part results from cortical modulation. In contrast, statistical analysis revealed no differences in imagery-induced recovery of motoneuron excitabilities whether assessed by F wave or MEP. Thus, increased excitability of spinal motoneurons responsible for F-wave changes also accounts for recovery of MEPs. Conclusions: Volitional relaxation depresses the spinal and cortical motoneurons, whereas mental simulation counters rest-induced suppression primarily by restoring spinal excitability. Significance: The present findings help elucidate physiologic mechanisms underlying motor imagery. (C) 2010 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:1405 / 1410
页数:6
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