Comparison of the effects of low-level laser and pulsed and continuous ultrasound on pain and physical disability in chronic nonspecific low back pain: a randomized controlled clinical trial

Abstract Objective: To compare the short-term effects of pulsed laser and pulsed and continuous ultrasound on pain and functional disability in women with chronic non-specific low back pain. Methods: The sample was composed of 100 volunteers randomly allocated into four groups: The Pulsed Laser Group (n = 26) was treated with 3 J/cm2; the Pulsed Ultrasound Group (n = 24; 3 MHz) was treated with 1 W/cm2; the Continuous Ultrasound Group (n = 26; 1 MHz) was treated with 1 W/cm2; and a Control Group (n = 24), where the patients were still waiting for treatment. Before and after 10 sessions of tr...