A detuned Medi-Link Systems ultrasound machine
from Electro-Medical Supplies (Greenham) Ltd. was
used. The subject was informed that pulsed ultrasound
was going to be used; that they should not feel
any sensation of heat or pain and that, if this was
felt, to let the clinician know and the machine
would be turned down. Since this was a sham procedure,
such adjustment made no actual difference.
Ultrasound lotion was applied over the TrP
and the ultrasound head was moved slowly over the
upper trapezius muscle in the region of the TrP for
2 min. The machine’s integrated timer was used to
alert the clinician when 2 min had elapsed.