Objectives: This study examined the health-related effects of two worksite interventions, physical exercise and reduced workhours, on women employed in dentistry. Methods: Six workplaces were randomized to one of the following three conditions: (i) 2.5 hours of weekly, mandatory physical exercise of middle-to-high intensity to be performed during workhours (N=62), (ii) a reduction of full-time weekly workhours from 40 to 37.5 hours (N=50), and (iii) reference. In all, 177 women participated. Biomarkers and self-ratings in questionnaires were obtained before the intervention (T1), and six (T2) and 12 months (T3) after the intervention. Results: The results showed increased levels of physical activity and exercise in all of the groups, the level of physical exercise being significantly greater in the physical exercise group. Repeated-measures analyses of variance using data from T1 and T3 for biological measures and all three time points for self-ratings produced significant interaction effects for glucose, waist-to-hip ratio, and work ability and clear trends for general symptoms and upper-extremity disorders. Posthoc analyses showed that the results of the health-related measures differed between the interventions, decreased glucose and upper-extremity disorders in the exercise group, and increased high-density lipoprotein and waist-to-hip ratio among those working reduced hours. Conclusions: These results show that the two interventions had small and varied effects on biomarkers and self-reports of different aspects of health among women. It is suggested that interventions involving a modest reduction in workhours seem to be more effective if these hours are used for physical exercise.
von Thiele Schwarz, U., Lindfors, P., & Lundberg, Ui. (2008). Health-related effects of worksite interventions involving physical exercise and reduced workhours. Scandinavian Journal of Work, Environment and Health, 34(3), 179–188. https://doi.org/10.5271/sjweh.1227