This article is from Journal of Physical Therapy Science , volume 26 . Abstract [Purpose] This study aimed to determine the differences in the excitability of spinal motor neurons during motor imagery of a muscle contraction at different contraction strengths. [Methods] We recorded the F-wave in 15 healthy subjects. First, in a trial at rest, the muscle was relaxed during F-wave recording. Next, during motor imagery, subjects were instructed to imagine maximum voluntary contractions of 10%,...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4135200