Journal of Clinical Neurophysiology

Skip Navigation LinksHome > October 2009 - Volume 26 - Issue 5 > Motor Imagery Facilitates the Spinal Motor Neurons Without H...
Journal of Clinical Neurophysiology:
doi: 10.1097/WNP.0b013e3181baaaa1
Original Article

Motor Imagery Facilitates the Spinal Motor Neurons Without Hemispheric Asymmetry

Ichikawa, Hiroo*; Kimura, Jun; Taniguchi, Shinichirou; Hara, Motohiko§; Fujisawa, Reiko; Shimizu, Hiroshi; Yamada, Thoru; Kawamura, Mitsuru*

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Purpose: To determine possible hemispheric differences of motor imagery in facilitating the anterior horn cells.

Methods: We conducted a side-to-side comparison of motor imagery to counter rest-induced suppression of spinal motor neurons in 10 right-handed healthy adults using the F wave as a measure of excitability. Studies consisted of sequential recording of F waves from the abductor pollicis brevis with 100 supramaximal stimuli applied to the median nerve on three consecutive sessions: (1) after standardized hand exercise to establish the baseline; (2) after immobilizing abductor pollicis brevis bilaterally for 3 hours, with one side assigned to relaxation task and the other side to motor imagery task; and (3) after standardized hand exercise to assess a recovery. The same sequence was repeated, switching the side of relaxation and motor imagery tasks.

Results: F-wave persistence and average amplitude showed a significant decrease (P < 0.01) from baseline after relaxation task, recovering quickly after exercise, but no change (P > 0.05) after motor imagery task. The results showed no significant differences (P > 0.05) between dominant and nondominant hands.

Conclusion: Motor imagery facilitates the spinal motor neurons without hemispheric asymmetry.

Copyright © 2009 American Clinical Neurophysiology Society


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