Effect of manual compressive therapy on latent myofascial trigger point pressure pain thresholds.

OBJECTIVE: This study compared the effects of 90 s of manual compressive therapy (MCT) on latent myofascial trigger points (LTPs) for 3 sessions per week for 4 weeks to determine changes in individual pressure pain threshold (PPT). A total of 30 (15 males, 15 females; age = 22 ±â€¯4 y/o, height = 175 ±â€¯18 cm, weight = 162.5 ±â€¯57.5 kg) symptomatic subjects with LTPs volunteered for the study. METHODS: PPT was measured at baseline and pre- and post-treatment for all 12 sessions with a pressure algometer across the 4-week treatment time frame. The MCT was applied to the control group on their LTP at pressure intended to provide a sham condition (1/10 on verbalized analog scale (VAS)). Two experimental groups had MCT applied either directly on the LTP (d-TP) or in close-proximity to their LTP (cp-TP) at moderate pressure (7/10 on VAS). RESULTS: There was a significant increase in PPT from the first through twelfth treatment sessions (p < 0.001, partial η2 = 0.914). A significant increase in PPTs between treatment groups was acutely observed from pre- to post-therapy tests (p = 0.001, partial η2 = 0.146). The differences between pre- versus post-treatment PPT measures indicated significant differences (d-TP vs. control, p < 0.001; cp-TP vs. control, p = 0.007). No differences were observed between experimental groups (p = 0.215). CONCLUSIONS: PPT continued to increase after several weeks of MCT when applied directly on or within 2.5 cm of an identified LTP compared to control.