This naturalistic study of 52 sailors on the USS Jason Dunham (DDG-109) compared actigraphic sleep and psychomotor vigilance performance of crewmembers working a 3hours-on/9hours-off (“3/9”) with the performance of their counterparts who worked a 6hours-on/6hours-off (“6/6”) watchstanding schedule. Crewmembers on the 3/9 slept more (6.46±0.77 hours) and reported less daytime sleepiness (Epworth Sleepiness Scale (ESS) score = 10.7±3.70) than their peers on the 6/6 schedule (sleep 5.89±0.87 hours; ESS = 13.1±3.45). The length of the workday for participants on the 6/6 schedule was 15 hours compared to 12.2 hours for crewmembers on the 3/9. Based on 11 of 13 Psychomotor Vigilance Task metrics, performance of crewmembers on the 6/6 schedule had significantly greater variability than the 3/9 sailors (p<0.05). Overall, participants evaluated the 6/6 as being worse and the 3/9 as the better schedule. Results showed that the 3/9 outperformed the 6/6 in terms of daily sleep duration, fatigue levels, psychomotor vigilance performance, and acceptance from the participants.
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References
1.
ÅkerstedtT. (2003). Shift work and disturbed sleep/ wakefulness. Occupational Medicine, 53, 89–94.
2.
ÅkerstedtT.KnutssonA.WesterholmP.TheorellT.AlfredssonL.KecklundG. (2002). Work organisation and unintentional sleep: results from the WOLF study. Occupational and Environmental Medicine, 59, 595–600.
3.
ÅkerstedtT.WrightK. P. (2009). Sleep loss and fatigue in shift work and shift work disorder. Sleep Medicine Clinics, 4, 257–271.
4.
ArnedtJ. T.OwensJ.CrouchM.StahlJ.CarskadonM. A. (2005). Neurobehavioral performance of residents after heavy night call vs after alcohol ingestion. JAMA, 294, 1025–1033.
5.
BasnerM.DingesD. F. (2011). Maximizing sensitivity of the Psychomotor Vigilance Test (PVT) to sleep loss. Sleep, 34(5), 581–591.
6.
BasnerM.RubinsteinJ. (2011). Fitness for duty: a 3-minute version of the Psychomotor Vigilance Test predicts fatigue-related declines in luggage-screening performance. Journal of Occupational and Environmental Medicine, 53(10), 1146-1154.
7.
BenjaminiY.HochbergY. (1995). Controlling the false discovery rate: A practical and powerful approach to multiple testing. Journal of the Royal Statistical Society. Series B (Methodological), 57, 289–300.
8.
ComperatoreC. A.KingsleyL.KirbyA.RiveraP. K. (2001). Management of endurance risk factors: A guide for deep draft vessels (Final Report No. CG-D-07-01). Groton, CT: U.S. Coast Guard Research and Development Center.
9.
Department of the Navy. (2012). Standard organization and regulations of the U.S. Navy - OPNAV Instruction 3120.32D. Washington, D.C.: Department of the Navy.
10.
DingesD. F.PowellJ. W. (1985). Microcomputer analyses of performance on a portable, simple visual RT task during sustained operations. Behavior Research Methods, Instruments, & Computers, 17(6), 652–655.
11.
IARC Monographs Working Group on the Evaluation of Carcinogenic Risks to Humans. (2010). IARC monographs on the evaluation of carcinogenic risks to humans: Painting firefighting, and shiftwork. Lyon, France: International Agency for Research on Cancer (IARC).
12.
JohnsM. W. (1991). A new method for measuring daytime sleepiness: The Epworth Sleepiness Scale. Sleep, 14, 540–545.
13.
KnutssonA. (2003). Health disorders of shift workers. Occupational Medicine, 53, 103–108.
14.
MeltzerL. J.WalshC. M.TraylorJ.WestinA. M. L. (2012). Direct comparison of two new actigraphs and polysomnography in children and adolescents. Sleep, 35, 159–166.
15.
MillerJ. C. (2006). Fundamentals of shiftwork scheduling (Report No. AFRL-HE-BR-TR-2006-0011). Brooks City-Base, TX: Air Force Research Laboratory.
MillerN. L.MatsangasP.KenneyA. (2012). The Role of Sleep in the Military: Implications for Training and Operational Effectiveness. In LaurenceJ. H.MatthewsM. D. (Eds.), The Oxford Handbook of Military Psychology (pp. 262–281). New York: Oxford University Press.
19.
PaulM. A.EbisuzakiD.McHargJ.HurshS. R.MillerJ. C. (2012). An assessment of some watch schedule variants used in Canadian Patrol Frigates (Technical Report Report No. DRDC Toronto TR 2012-078). Toronto, Canada: Defence Research and Development.
20.
RutenfranzJ.PlettR.KnauthP.CondonR.De VolD.FlethcherN.. . . ColquhounW. P. (1988). Work at sea: A study of sleep, and of circadian rhythms in physiological and psychological functions, in watchkeepers on merchant vessels. II. Sleep duration, and subjective ratings of sleep quality. International Archives of Occupational and Environmental Health, 60, 331–339.
21.
SallinenM.KecklundG. (2010). Shift work, sleep, and sleepiness - differences between shift schedules and systems. Scandinavian Journal of Work, Environment & Health, 36, 121–133.
22.
ShattuckN. L.MatsangasP. (2014). Work and rest patterns and psychomotor vigilance performance of crewmembers of the USS Jason Dunham: A comparison of the 3/9 and the 6/6 watchstanding schedules (Technical Report). Monterey, CA: Naval Postgraduate School.
23.
United States Code, Supplement 5 Title 46 § 8104 (2006).
24.
WagstaffA. S.Sigstad LieJ.-A. (2011). Shift and night work and long working hours − a systematic review of safety implications. Scandinavian Journal of Work, Environment & Health, 37(3), 173–185.
