We will use advanced, recently developed methods to identify fatigue-related indicators relevant to human error and accidents, together with measurements of subclinical effects on the cardiovascular system. Continuous measurements of heart rate variability (HRV) during working time, leisure time and night, will be used as an intermediate outcome variable representing a proxy for risk of cardiovascular disease.
The cognitive tests, the fitting of the HRV-monitor, and the completion of questionnaires will be performed at the work site. Participants will also write a daily log of work.

The project will be organized by, and performed within the NIOH, in cooperation with the University of Eastern Finland for analyses of the HRV, and in cooperation with the Institute of Aviation medicine and Dr Kazuma form the Jikei Institute, Osaka Japan, regarding the use and analyses of the cognitive tests.