Estudio Psicométrico del Índice de Carga Mental NASA-TLX con una Muestra de Trabajadores Españoles.

The objective of this study was to assess the psychometric properties of NASA-Task Load Index using several groups of Spanish workers. The sample consisted of 398 workers who belonged to seven different jobs. All workers assessed the perceived mental workload when perform their jobs, due to each of the six dimensions of mental workload that distinguishes the NASA-TLX: effort, mental demand, physical demand, temporal demand, performance and frustration. The results showed that NASA-Task Load Index had a acceptable internal consistency and a factorial structure formed by two components. The first of the two components was formed by all of the NASA-TLX dimensions except frustration. The second was formed only by frustration dimension. Significant differences in the profiles of mental workload experienced by workers on the basis of their jobs were found for all NASA-TLX dimensions except in performance. [ABSTRACT FROM AUTHOR]