Effects of physical exercise at the workplace for treatment of low back pain: a systematic review with meta-analysis/ Efeitos do exercicio fisico no ambiente de trabalho no tratamento da dor lombar: uma revisao sistematica com metanalise

Background: The prevalence of low back pain is high among the economically active population. Low back pain reduces productivity and causes absenteeism, impaired quality of life and leaves of absence. Several measures were suggested to reduce the occurrence of this occupational condition, among which physical exercise at the workplace stands out. Aim: To analyze studies which assessed physical exercise at the workplace for treatment of low back pain. Methods: The present study consisted of a systematic review with meta-analysis. An electronic search was conducted on database MEDLINE using keywords "workplace," "low back pain" and "exercise," synonyms and headings located on Health Sciences Descriptors and Medical Subject Headings. We considered all the studies that included physical exercise at the workplace and defined low back pain as outcome. Results: We located 499 potential studies and finally included 15 for review. The duration of treatment varied from 3 weeks to 18 months, and the main interventions were strength and stretching exercises and muscle relaxation. Conclusions: The meta-analysis showed that physical exercise at the workplace did not reduce the occurrence of low back pain (difference of means=0.62, 95%CI -0.8-2.04, p