Nonstandard working schedules and health: the systematic search for a comprehensive model.
BACKGROUND
Theoretical models on shift work fall short of describing relevant health-related pathways associated with the broader concept of nonstandard working schedules. Shift work models neither combine relevant working time characteristics applicable to nonstandard schedules nor include the role of rest periods and recovery in the development of health complaints. Therefore, this paper aimed to develop a comprehensive model on nonstandard working schedules to address these shortcomings.


METHODS
A literature review was conducted using a systematic search and selection process. Two searches were performed: one associating the working time characteristics time-of-day and working time duration with health and one associating recovery after work with health. Data extracted from the models were used to develop a comprehensive model on nonstandard working schedules and health.


RESULTS
For models on the working time characteristics, the search strategy yielded 3044 references, of which 26 met the inclusion criteria that contained 22 distinctive models. For models on recovery after work, the search strategy yielded 896 references, of which seven met the inclusion criteria containing seven distinctive models. Of the models on the working time characteristics, three combined time-of-day with working time duration, 18 were on time-of-day (i.e. shift work), and one was on working time duration. The model developed in the paper has a comprehensive approach to working hours and other work-related risk factors and proposes that they should be balanced by positive non-work factors to maintain health. Physiological processes leading to health complaints are circadian disruption, sleep deprivation, and activation that should be counterbalanced by (re-)entrainment, restorative sleep, and recovery, respectively, to maintain health.


CONCLUSIONS
A comprehensive model on nonstandard working schedules and health was developed. The model proposes that work and non-work as well as their associated physiological processes need to be balanced to maintain good health. The model gives researchers a useful overview over the various risk factors and pathways associated with health that should be considered when studying any form of nonstandard working schedule.
Research group Work and Safety, International Research Institute of Stavanger, PO Box 8046, 4068, Stavanger, Norway. slmerkus@gmail.com.|Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Center, PO Box 7057, 1007 MB, Amsterdam, The Netherlands. slmerkus@gmail.com.
Suzanne L
SL
Merkus
Research group Work and Safety, International Research Institute of Stavanger, PO Box 8046, 4068, Stavanger, Norway. kari.anne.holte@iris.no.
Kari Anne
KA
Holte
Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Center, PO Box 7057, 1007 MB, Amsterdam, The Netherlands. m.huijsmans@vumc.nl.|Body@Work TNO VUmc, Research Center on Physical Activity, Work & Health, VU University Medical Center, Amsterdam, The Netherlands. m.huijsmans@vumc.nl.
Maaike A
MA
Huysmans
Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Center, PO Box 7057, 1007 MB, Amsterdam, The Netherlands. w.vanmechelen@vumc.nl.|Body@Work TNO VUmc, Research Center on Physical Activity, Work & Health, VU University Medical Center, Amsterdam, The Netherlands. w.vanmechelen@vumc.nl.
Willem
W
van Mechelen
Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Center, PO Box 7057, 1007 MB, Amsterdam, The Netherlands. a.vanderbeek@vumc.nl.|Body@Work TNO VUmc, Research Center on Physical Activity, Work & Health, VU University Medical Center, Amsterdam, The Netherlands. a.vanderbeek@vumc.nl.
Allard J
AJ
van der Beek
D001071:Appointments and Schedules; D002940:Circadian Rhythm; D005260:Female; D006262:Health; D006801:Humans; D008297:Male; D008954:Models, Biological; D010561:Personnel Staffing and Scheduling; D012146:Rest; D012307:Risk Factors; D012890:Sleep; D014937:Work; D014940:Work Schedule Tolerance / Q000502:physiology*