Herrera-Espitia, S.C., Olaya-Mira, N., Soto-Cardona, I.C. y Osorio-Vasco, J. 2024. Biomechanical analysis of the lumbar area using surface electromyography: Flexion–relaxation ratio in maintenance workers. Revista Facultad Nacional de Salud Pública. 42, (ago. 2024), e356473. DOI:https://doi.org/10.17533/udea.rfnsp.e356473.