Article

The aim of this study was to evaluate the effect of repetitive peripheral
magnetic stimulation at two different frequencies (20 and 30 Hz) on cortical
excitability in motor areas related to swallowing in healthy individuals. The
study participants were 10 healthy normal volunteers (two women and eight men,
age range 25-36 years). Repetitive peripheral magnetic stimulation was applied to
the submandibular muscle using a parabolic coil at the site where contraction of
the suprahyoid muscles was elicited. Stimulation was continued for 10 min (total
1200 pulses) at 20 Hz on 1 day and at 30 Hz on another day, with the stimulation
strength set at 90% of the intensity that elicited pain. The motor-evoked
potential amplitude of suprahyoid muscles was assessed before, immediately after,
and 30 min after stimulation. Stimulations at both 20 and 30 Hz significantly
increased motor-evoked potential amplitude (P<0.05), with the increase maintained
until 30 min after stimulation. The motor-evoked potential amplitude immediately
after stimulation was not significantly different between the 20 and 30 Hz
frequencies. The results indicated that repetitive magnetic stimulation increased
motor-evoked potential amplitude of swallowing muscles, suggesting facilitation
of the motor cortex related to swallowing in healthy individuals.

Langue : ANGLAIS