Influence of Motor Imagery of Isometric Opponens Pollicis Activity on the Excitability of Spinal Neural Function—Comparison of Contraction Strength

• Published in: Rigaku ryoho kagaku Vol. 27; no. 3; pp. 335 - 339
• Main Authors: BUNNO, Yoshibumi, SUZUKI, Toshiaki
• Format: Journal Article
• Language: English
• Published: The Society of Physical Therapy Science 2012
• Subjects: Age; F-wave; isometric opponens pollicis contraction; motor imagery
• ISSN: 1341-1667; 2434-2807
• DOI: 10.1589/rika.27.335

[Purpose] To study the difference of the excitability of spinal neural function at 10 and 50%MVC motor imagery. [Subjects] Subjects were 25 healthy subjects, mean age of 24.7±7.27 years. [Methods] We recorded the F-wave under 3 conditions. 1) In the rest condition, we recorded F-wave during relaxation. 2) At 10 and 50%MVC motor imagery, subjects were asked to imagine contraction while holding a pinch meter. 3) In the after imagery period, we recorded the F-wave at 0, 5, 10 and 15 minutes after imagery. [Results] Both persistence and the amplitude ratio of F/M during 10 and 50%MVC imagery were significantly higher than that at rest. The relative values of 50%MVC imagery to rest tended to be higher than those of 10%MVC imagery. [Conclusion] We consider that 50%MVC motor imagery increased the excitability of the spinal neural function more than 10%MVC motor imagery.