Mechanical withdrawal thresholds of spinal nocifensive reflexes were measured on the left paw using Electronic von Frey Aesthesiometer (IITC Life Science, Woodland Hills, CA, United States) with a plastic tip in an exclusive testing area (catalog number 76-0488, Harvard Apparatus, Holliston, MA, United States) 1 day before-SNL and 1, 2, 3, and 4 weeks after respective treatments, as described in our previous studies (Ji et al., 2018 (link); Shen et al., 2022b (link)). The average of six measurements per subject, taken at least 30 s apart, was calculated.
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