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- Pré-teste e validação de um procedimento para a análise de movimentos de reposicionamento da coluna lombarPublication . Ramos, Diana; Santos, Rubim; Rodrigues, MatildeMobile devices are becoming more common between young people, both for personal and school use. However, during the use of these equipment, they can adopt awkward postures for long periods, contributing for musculoskeletal disorders. The project “Mobile Devices, what risks?” intends to better characterize this problem. This study aims to test and validate a procedure to determine and analyse the repositioning movements of the lumbar spine during a sitting posture. For this analysis, two different systems were used: tri-axial accelerometers system; video recording. The study showed that both methods can be used to identify repositioning movements. However, better results for inter and intrareliability were found for the accelerometer system.