Effects of neck muscle vibration on motor planning in healthy young adults

The intervention will consist of experimentally induced, high-frequency, low-amplitude mechanical vibration applied to cervical muscles to transiently alter proprioceptive afferent input. Vibration will be delivered using portable mechanical vibration devices affixed to the skin over the right sternocleidomastoid muscle and left cervical extensor muscles using Hypafix tape. Participants randomly assigned to the active intervention group will receive mechanical vibration at a frequency of 100 Hz with an amplitude of less than 1 mm for a single continuous period of 10 minutes. The intervention will be delivered once during a single laboratory visit following baseline assessments. The intervention will be delivered face-to-face on an individual basis in a controlled laboratory environment at a university research facility by trained research personnel with experience in neuromuscular and neurophysiological experimental protocols. Intervention fidelity will be ensured through the use of identical vibration devices and standardized placement procedures across participants. Adherence will be ensured through direct supervision by research staff, and completion of the full 10-minute stimulation period will be confirmed for all participants.