Rehabilitation of back pain with laser associated with negative or positive pressure massage in workers: A randomized controlled trial

Background and purpose: Work-related musculoskeletal disorders (WMSDs) are an array of conditions affecting the human locomotor system, such as muscles, tendons, nerves, bones, and joints. It is related to physiological, kinesiological and biomechanical changes which result in pain, paresthesia, inflammation, weakness, tiredness, heaviness in limbs, fatigue, reduced range of motion and/or compression of peripheral nerves. The aim of this study was to investigate the therapeutic effects of positive (massage gum) or negative pressure (vacuum therapy) combined with laser on the health of workers with back pain, investigating pain intensity, shoulder mobility, spinal flexibility, life quality, and well-being.

Methods: Twenty-one workers (female and male) aged between 20 and 60 years and who had medical referral for pain complaint in low back, neck and shoulders due to WMSDs participated in this study and were randomized into 3 groups: (1) Positive Pressure plus Laser Group (PPL): positive pressure using a massage gun was applied after the laser; (2) Negative Pressure plus Laser Group (NPL): negative pressure by vacuum was applied together with the laser and; (3) Control group (CG): without positive and negative pressure treatments or laser therapy. All workers received an educational booklet with postural orientation and suggestions focused on stretching exercises. Anamnesis, visual analogue scale (VAS) to assess pain intensity, and functional tests to assess spine flexibility and shoulders mobility were performed. Quality of life and well-being also were evaluated. The regions of lumbar, thoracic and cervical spine were treated once a week, totaling seven sessions.

Results: The main result was a reduced pain and an increased spinal flexibility, shoulders mobility, and quality of life in the PPL and NPL groups compared to the CG (p < 0.05). Furthermore, NPL showed better results compared to PPL (p < 0.05) for lumbar and cervical pain, as well as for right shoulder mobility.

Conclusion: Therefore, laser combined with negative pressure massage was more effective in reducing lumbar and cervical pain and increasing shoulder mobility compared to positive pressure massage in workers.