Source avec lien : Ergonomics, (En ligne). 10.1080/00140139.2022.2026490
Des études biomécaniques antérieures suggèrent qu’une charge de travail cognitive mentale plus élevée lors de l’exécution de tâches informatiques de bureau peut augmenter le risque de TMS chez les employés de bureau. La charge de travail cognitive peut être interprétée en termes de facteurs liés à la tâche (par exemple, la complexité de la tâche et la pression temporelle) et de facteurs liés à la charge mentale, qui comprennent la demande mentale et l’effort mental. Une étude en laboratoire a été menée afin d’explorer plus avant la manière dont les facteurs de tâche et de charge mentale affectent les réponses biomécaniques des utilisateurs d’ordinateurs, en particulier les niveaux d’activation musculaire et les postures assises.
Previous biomechanics studies suggest that higher cognitive mental workload when performing office computer tasks may increase the risk of MSDs among office workers. Cognitive workload can be interpreted in terms of task factors (e.g. task complexity and time pressure) and mental workload factors which include mental demand and mental effort. A laboratory study was conducted to further explore how the task and mental workload factors affected computer users’ biomechanical responses, specifically the muscle activation levels and sitting postures. Data were collected as 20 participants worked on computer tasks which varied in their levels of task complexity and time pressure. Visual analog scales were used for assessing mental workload factors. Results indicated that the level of mental effort reported, as opposed to the level of task complexity, was associated with changes in participants’ biomechanical responses, but primarily occurred when the chair’s backrest was not used. Practitioner summary: A study was conducted to investigate the association between computer users’ cognitive workload and biomechanical responses when performing computer task. While task complexity was not directly associated with the changes in participants’ biomechanical responses, higher reported mental effort was associated with increased biomechanical responses, but only when the participants did not use the backrest on the chair.