Fifty-six female patients with nonspecific low back pain were randomized to receive high-force massage therapy (n=28) or low-force massage therapy (n=28). The primary outcome of interest was pain intensity at 4 weeks, measured using the Visual Analog Scale (VAS). Secondary outcomes such as pain pressure threshold (PPT) and trunk mobility were measured at 4 weeks and Oswestry Disability Index (ODI), Roland-Morris Low Back Pain Disability Questionnaire (RMQ), and the World Health Organization Quality of Life (WHOQOL) were measured at 4 and 8 weeks. A between-group subgroup analyses of pain scores was also conducted at 8 weeks. The high-force massage therapy group reported significantly lower pain scores at 4 weeks, compared to the low-force massage therapy group.