The relationship between circadian types and mental workload in assembly workers of a manufacturing company

Some of people prefer daily activities; others, nightly ones. Studies have shown that performance levels may be affected by circadian rhythms. The high mental workload occurs when the task is greater than the capacity of the operator. Regarding the probable relationship between circadian types and mental workload, we decided to evaluate this factor in the assembly workers of a manufacturing company.

The study was a descriptive -analytic and cross-sectional one being carried out among 120 female assembly workers of manufacturing company. In order to evaluate of circadian types and mental work load, Iranian version of MEQ (Moring- Evening Questionnaire) and NASA-TLX (NASA-Task Load Index) have respectively been used. Data analysis was carried out by using SPSS 20. It is noteworthy to mention that P value