Myelinated Afferents Are Involved in Pathology of the Spontaneous Electrical Activity and Mechanical Hyperalgesia of Myofascial Trigger Spots in Rats

Table 1

Mechanical pain thresholds at MTrSs/non-MTrSs at different time before and after TTX injection.

Time (min)	MTrSs		Non-MTrSs
	Mean (g)	SD (g)	Mean (g)	SD (g)
0	235.50	20.05	415.00	15.22
5	300.10	14.63	379.00	13.74
15	343.00	13.12	423.40	15.63
30	369.90	9.94	431.30	10.70

“#” represents, before the TTX injection, MPTs at MTrSs were significantly lower than those at non-MTrSs (). “@” represents, 5 min, 15 min, and 30 min after the TTX injection, MPTs at MTrSs increased significantly (). “” represents, 5 min after the TTX injection, MPTs at non-MTrSs were lower than those before the injection (). “!” represents, 15 min and 30 min after the TTX injection, MPTs at non-MTrSs were higher than those at non-MTrSs before injection, but the differences did not reach the significant level (). “&” represents, 30 min after TTX injection, MPTs at MTrSs were significantly lower than those at non-MTrSs ().