A1 Journal article (refereed)
The Effects of Individual Characteristics of the Naval Personnel on Sleepiness and Stress during Two Different Watchkeeping Schedules (2022)


Myllylä, M., Kyröläinen, H., Ojanen, T., Ruohola, J.-P., Heinonen, O. J., Simola, P., Vahlberg, T., & Parkkola, K. I. (2022). The Effects of Individual Characteristics of the Naval Personnel on Sleepiness and Stress during Two Different Watchkeeping Schedules. International Journal of Environmental Research and Public Health, 19(20), Article 13451. https://doi.org/10.3390/ijerph192013451


JYU authors or editors


Publication details

All authors or editorsMyllylä, Mikko; Kyröläinen, Heikki; Ojanen, Tommi; Ruohola, Juha-Petri; Heinonen, Olli J.; Simola, Petteri; Vahlberg, Tero; Parkkola, Kai I.

Journal or seriesInternational Journal of Environmental Research and Public Health

ISSN1661-7827

eISSN1660-4601

Publication year2022

Publication date18/10/2022

Volume19

Issue number20

Article number13451

PublisherMDPI

Publication countrySwitzerland

Publication languageEnglish

DOIhttps://doi.org/10.3390/ijerph192013451

Publication open accessOpenly available

Publication channel open accessOpen Access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/84216

Publication is parallel publishedhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC9603121/


Abstract

Background: Naval service can have a significant impact on the wellbeing of seafarers, and the operation of warships is highly dependent on the personnel on board. Nevertheless, there is a lack of knowledge concerning the impact of seafarers’ individual characteristics on their wellbeing in a naval environment. Therefore, the aim of this study was to investigate individual characteristics of the naval personnel that may be associated with the amount of sleepiness, fatigue and stress responses experienced during shift work and irregular working hours in a naval environment. Methods: The study took place on a Finnish Defence Forces’ Navy missile patrol boat on which 18 crewmembers served as study participants. The measurement periods lasted two separate weeks (seven days and six nights) during shift work with two different watchkeeping systems (4:4, 4:4/6:6). The onboard measurements consisted of the Karolinska Sleepiness Scale, salivary stress hormones, cognitive tests (Sustained Attention to Response Task and N-back Task) and heart rate variability. Results: Participants of older ages or with a longer history in naval service were associated with a greater amount of sleepiness, fatigue and stress responses on board. On the contrary, increased physical activity and a higher level of physical fitness, especially standing long jump, were associated with a lower amount of sleepiness, fatigue and fewer stress responses. In addition, an athletic body composition together with a healthy lifestyle may be beneficial, considering the stress responses on board. Conclusion: The present results are well in line with the previous literature regarding shift work and irregular working hours. The results highlight the importance of regular physical activity and good physical fitness during service in the naval environment.


Keywordsatypical workshift workwork burdenfatigue (biological phenomena)stress (biological phenomena)physiological factorsindividualitynaval forcespatrol boats

Free keywordsindividual characteristics; individual factors; shift work; watchkeeping; irregular working hours; sleepiness; fatigue; stress; navy


Contributing organizations


Ministry reportingYes

Reporting Year2022

JUFO rating1


Last updated on 2024-03-04 at 19:36