Cambios de las propiedades contráctiles del músculo erector espinal durante una semana laboral

espanolObjetivo: Describir la evolucion de las caracteristicas contractiles del erector espinal durante una semana laboral en trabajadores que pasan mas de un 50% de su jornada laboral en sedestacion. Material y metodo: Estudio descriptivo, prospectivo. La muestra estuvo compuesta por 44 sujetos sanos (edad 37,1 ± 7,7 anos; estatura 173 ± 9,1cm.; peso 72,36 ± 15,1 kg). Se utilizo la tensiomiografia (TMG) para evaluar las caracteristicas contractiles del erector espinal durante 5 dias consecutivos. Resultados: Se observo un aumento estadisticamente significativo en el Tiempo de contraccion (Tc) entre las mediciones de lunes, martes y miercoles respecto a las mediciones de jueves y viernes (p0,5). Conclusion: El tiempo de respuesta muscular se enlentece con el avance de la semana laboral. Sin embargo, la rigidez y el proceso de relajacion no se ven alterados. EnglishPurpose: To describe the contractile properties evolution of the erector spinae muscle during a labour week in workers who stay more than 50% of the working schedule in sedestation position. Material and method: An observational prospective study was carried out. A sample of 44 healthy subjects (age 37.1 ± 7.7 years, height 173 ± 9.1 cm, weight 72.36 ± 15.1 kg) were daily measured during 5 days. Tensiomyography (TMG) was used to measure the contractile properties of the erector spinae muscle. Result: Statistically significant increment were found in the contraction time (Tc) for Monday, Tuesday and Wednesday respect to Thursday and Friday (p0.5). Conclusion: The muscle time contraction response is slowed down with the progress of a labour week. Nevertheless, the stiffness and relaxation process were not modified.