01373nas a2200229   4500000000100000008004100001260007600042653001100118653002000129653003000149653001500179100002700194700002700221700002600248700002700274245008300301300001200384490000700396520071200403022001401115020001401129       2010                            d  c06/2010bSociedad Española para el Estudio de la Ansiedad y el Estrés10aHealth10aMental workload10aPsychosocial risk factors10asick leave1 aSusana Rubio Valdehita1 aEva María Diaz Ramiro1 aJesús Martin García1 aLourdes Luceño Moreno00aMental workload as a psychosocial risk factor. Differences based on sick leave  a271-2820 v163 aMental workload is one of the most important psychosocial risk factors. It is defined in terms of the difference between the worker s resources and job demands. Overload and underload conditions cause problems in workers  performance and health. In this paper, the appraisal of workload is compared among two groups of workers (those who had versus those who had not suffered at least one medical problem during the previous year). The NASA-TLX instrument was administered to a sample of 509 workers in order to assess mental workload. Results show that, in general, workers who have been on sick leave perceive higher levels of mental workload, especially in terms of effort, mental demand and frustration.  a1134-7937  a2174-0437