Low-level laser therapy combined to functional exercise on treatment of fibromyalgia: a double-blind randomized clinical trial

This study aims to investigate the effects of low-level laser therapy (LLLT) combined to a functional exercise program on treatment of FM. A double-blind and placebo-controlled randomized clinical trial composed of 22 women divided into two groups: placebo group (functional exercise program associated with placebo phototherapy n=11) and laser group (same exercise program associated with active phototherapy; n=11). Each session lasted from 40 to 60min and was performed three times a week for 8weeks. Phototherapy (808nm, 100mW, 4J, and 142.85J/cm(2) per point) was bilaterally applied to different points of the quadriceps (8), hamstrings (6), and triceps sural muscles (3) immediately after each exercise session. Pre- and post-intervention evaluations regarding pain (sites, intensity, and threshold), functional performance (balance, functional tests), muscle performance (flexibility and isokinetic variables), depression, and quality of life were conducted. A reduction in pain and improvement in functional and muscular performance, depression, and quality of life were observed in both groups (p<0.05); however, with no significant differences between them (p>0.05). In conclusion, the benefic effects of functional exercise were not improved by combination with LLLT.