Participants in the MI + rPMS group were provided with rPMS on the right forearm during the MI task. rPMS targeted the right extensor carpi radialis longus, and the motor points were identified by repetitive stimulation to determine the location and orientation of the PMS coil during MI. We placed the coil on the right extensor carpi radialis longus with the handle facing the proximal part (i.e., the upper arm) at an angle of 45° to the forearm (Figure 2 ). rPMS was provided using a magnetic stimulation machine (MagPro R20; MagVenture, Inc., Farum, Denmark) and an rPMS coil (MC-B70; MagVenture, Inc., Farum, Denmark). The rPMS coil used in this study was a figure-eight coil. The inner and outer diameters of this coil are 27 mm and 97 mm, respectively, with a pulse width of 280 μs. The stimulation frequency, stimulation duration, and stimulation intensity was set to 20 Hz [39 (link)], 5 s, and 1.2 times the motor threshold [3 (link)], respectively. The motor threshold was the minimum intensity at which the muscle contracted upon stimulation and was visually assessed by two examiners [32 (link)]. rPMS induced dorsiflexion of the wrist joint during stimulation.
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