Decreased Spontaneous Electrical Activity and Acetylcholine at Myofascial Trigger Spots after Dry Needling Treatment: A Pilot Study

Table 1

Changes in the amplitudes and frequencies of EPN and EPS before and after dry needling.

Groups	Parameters	EPN		EPS
		BDN	ADN	BDN	ADN
BC	Amplitude (µV)			/	/
	Frequency (Hz/s)	/	/	/	/
MC	Amplitude (µV)
	Frequency (Hz/s)
DN-M	Amplitude (µV)
	Frequency (Hz/min)
DN-nM	Amplitude (µV)
	Frequency (Hz/min)

Note. indicates a significant difference in amplitudes or frequencies among groups. indicates a significant difference in amplitudes or frequencies compared with before and after dry needling treatment. BC: blank control, MC: MTrSs control, DN-M: dry needling at MTrSs, and DN-nM: dry needling at non-MTrSs; EPN: endplate noise; EPS: endplate spikes; BDN: before dry needling; ADN: after dry needling.