TITLE:
Motor Imagery did not Improve Strength of Biceps Brachii
AUTHORS:
Lanxiang He, Zhijun Tian
KEYWORDS:
Motor Imagery; EMG; Peak Torque; Reaction Time
JOURNAL NAME:
Engineering,
Vol.4 No.10B,
October
21,
2013
ABSTRACT:
Numerous studies have confirmed that motor imagery
may result in plastic change in motor system as actual physical activity. However,
whether motor imagery can improve muscle strength of the trained persons
remains unclear. The aim of this study is to investigate the effect of motor
imagery on muscle strength. Totally 12 healthy college students were involved
in 4 weeks of mental rehearsal of right upper limb movements (flexion and
extension of elbow) during 30 min supervision session three times a week. Electromyogram
(EMG) and peak torque of biceps brachii, reaction time of subjects
were analyzed. Results showed that no significant change in EMG of biceps brachii was observed during motor imagery. After motor rehearsal for 4 weeks,
statistically significant difference in EMG, peak torque and reactivity were
not observed (P > 0.05) when compared with the baseline data.
Therefore, motor imagery could not enhance muscle strength of subjects. Whether
mental practice is a valid rehabilitation technique needs to be investigated
further.