Effects of operational assessment of the 4:4 and 4:4/6:6 watch systems on sleepiness, fatigue, and stress responses during patrolling on a navy missile patrol boat
Myllylä, M., Kyröläinen, H., Ojanen, T., Ruohola, J.-P., Heinonen, O. J., Vahlberg, T., & Parkkola, K. I. (2022). Effects of operational assessment of the 4:4 and 4:4/6:6 watch systems on sleepiness, fatigue, and stress responses during patrolling on a navy missile patrol boat. Chronobiology International, 39(9), 1233-1241. https://doi.org/10.1080/07420528.2022.2090374
Published inChronobiology International
© 2022 the Authors
The operation of naval vessels involves watchkeeping 24 h per day, which is globally carried out by a variety of different watch systems. In this study, the rotating 4:4 and fixed 4:4/6:6 two-section watch systems were compared in terms of sleepiness, fatigue, and stress responses. The data collection took place on a Finnish Defence Forces’ (FDF) Navy missile patrol boat with 15 crew members serving as study participants. The data collection periods lasted two separate weeks (7 days, 6 nights) with the different watch systems. The subjective sleepiness of the participants was assessed before and after every watch using the Karolinska Sleepiness Scale (KSS). Stress responses were assessed daily by the recorded levels of salivary alpha-amylase (sAA), cortisol (sCor), immunoglobulin A (sIgA), and dehydroepiandrosterone (sDHEA). The participants’ sustained attention, inhibitory control, and working memory were assessed daily by cognitive tests (SART, N-Back). The heart rate variability (HRV) during an orthostatic test was used as an additional daily marker to assess the amount of psychological stress of the participants. In this study, the difference regarding sleepiness and fatigue between the study weeks was most visible in the subjective KSS, which clearly favored the 4:4/6:6 system. The results of sAA and sIgA also suggested that the subjects were psychologically less stressed during the study week with the 4:4/6:6 watch system. Cognitive test results (SART, N-Back) indicated that there were overall no significant differences in the subjects’ sustained attention, inhibitory control, or working memory during the study weeks or between the study weeks. The results of the HRV data during the daily orthostatic tests were inconclusive but there was some indication that the subjects were less stressed during the study week with the 4:4/6:6 watch system. In conclusion, the present study indicates that in navy surface operations: working with the fixed 4:4/6:6 watch system causes less sleepiness, fatigue, and psychological stress than working with the rotating 4:4 watch system. The study result is well in line with previous research regarding watch systems. ...
PublisherTaylor & Francis
ISSN Search the Publication Forum0742-0528
Publication in research information system
MetadataShow full item record
- Liikuntatieteiden tiedekunta 
Additional information about fundingThe study was funded by the Finnish Defence Forces’ Joint Healthcare and the Navy Command Finland
Showing items with similar title or keywords.
The Effects of Individual Characteristics of the Naval Personnel on Sleepiness and Stress during Two Different Watchkeeping Schedules Myllylä, Mikko; Kyröläinen, Heikki; Ojanen, Tommi; Ruohola, Juha-Petri; Heinonen, Olli J.; Simola, Petteri; Vahlberg, Tero; Parkkola, Kai I. (MDPI AG, 2022)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 ...
Sleep and sleepiness in shift-working tram drivers Onninen, Jussi; Hakola, Tarja; Puttonen, Sampsa; Tolvanen, Asko; Virkkala, Jussi; Sallinen, Mikael (Elsevier, 2020)Driver sleepiness contributes to traffic accidents. However, sleepiness in urban public transport remains an understudied subject. To fill this gap, we examined the sleepiness, sleep, and on-duty sleepiness countermeasures ...
The self-reported causes of sleepiness in shift-working tram and truck drivers Onninen, Jussi; Pylkkönen, Mia; Hakola, Tarja; Puttonen, Sampsa; Virkkala, Jussi; Tolvanen, Asko; Sallinen, Mikael (Elsevier, 2021)Identifying the causes of sleepiness in various safety-critical work environments is necessary for implementing more efficient fatigue management strategies. In transportation, little is known about drivers’ own perceptions ...
Effects of overnight military training and acute battle stress on the cognitive performance of soldiers in simulated urban combat Passi, Tomi; Lukander, Kristian; Laarni, Jari; Närväinen, Johanna; Rissanen, Joona; Vaara, Jani, P.; Pihlainen, Kai; Kallinen, Kari; Ojanen, Tommi; Mauno, Saija; Pakarinen, Satu (Frontiers Research Foundation, 2022)Understanding the effect of stress, fatigue, and sleep deprivation on the ability to maintain an alert and attentive state in an ecologically valid setting is of importance as lapsing attention can, in many safety-critical ...
Autonomic nervous system responses during a relationship enrichment intervention Karolaakso, Tino; Lampinen, Elina (2014)Vaikka ihmisten fysiologia on ollut tutkijoiden kiinnostuksen kohteena psykologiassa jo pitkään, psykofysiologisia reaktioita pariterapiassa ei ole vielä tutkittu. Tässä tutkimuksessa tutkittiin neljää pariskuntaa ...