Ultrasound-Guided Percutaneous Neuromodulation in the Strength of CrossFit Athletes

"The US-PNM intervention uses a square-wave biphasic current (10 Hz, 250 ms pulse width) at maximum tolerable intensity for 1.5 minutes (10 seconds 10 times), per Fermín Valera and Fran Minaya's protocol. Participants will lie on their side, with the area cleaned and an ultrasound probe cover used.~Needles (Agu Punt, Spain) will be inserted perpendicularly to target the nerve perineurium. For the axillary nerve (C5-C6), a 0.40/0.50×25 mm needle will be used in a short axis at 80°. For the suprascapular nerve (C5-C6), a 0.30/0.40×25 mm needle will be used.~Each session involves two needle insertions, with the needle stationary and monitored by a physiotherapist with two years of experience."