Field study of sleep and functional impairments in solo sailing races


Multi-day single-handed sailing races put exceptional strain on sailors, requiring high cognitive functioning and 24 h per day readiness to perform. Fatigue from sleep loss, circadian misalignment, workload and other factors is of significant concern, jeopardizing competitiveness as well as safety. Almost no research has been devoted to this, in part because collecting data on sleep and performance in solo sailors during races at sea is challenging. The present study aimed to contribute valuable data on the issue by assessing sleep-wake patterns and functional impairments in a total of 16 sailors during a two-leg transatlantic race. Each sailor recorded sleep periods and functional impairments during the two legs of the race. Self-reported sleep duration per 24 h was 4.1 ± 0.4 h in the first (shorter) leg and 4.6 ± 0.4 h in the second (longer) leg. Sleep was polyphasic and varied in a normal circadian pattern - sleep propensity was highest (about 50%) in the middle of the night, with a smaller (nearly 15%) secondary peak in the middle of the afternoon. Significant functional impairments were reported throughout the race including technical errors, mood changes and hallucinations. These impairments are consistent with the typical effects of substantial sleep loss and are likely to reduce the safety margin. Single-handed sailors could benefit from the development of innovative tools to help them to manage sleep and fatigue and thereby improve safety and effectiveness.

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  1. 1

    Stampi C. Ultrashort sleep/wake patterns and sustained performance. In: Dinges DF, Broughton RJ, eds. Sleep and Alertness: Chronobiological Behavioral and Medical Aspects of Napping. Raven Press Ltd.: New York, 1989; 139–69.

    Google Scholar 

  2. 2

    Stampi C. Application of actigraphs for detection of rest activity patterns in competitive solo-sailors. Sleep Res. 1989 18 379.

    Google Scholar 

  3. 3

    Tiberge M. Sommeil et performances. In: Benoit O, Goldenberg F, eds. Exploration du sommeil et de la vigilance chez l’adulte. Editions Médicales Internationales: Cahan, France, 1992; 342–51.

    Google Scholar 

  4. 4

    Groslambert A, Candau RB, Millet GP. Effect of sleep deprivation on anxiety and perceived fatigue during a one-man atlantic ocean crossing on a sport catamaran. Environ. Behav. 2008 40 96–110.

    Article  Google Scholar 

  5. 5

    Weston NJV, Thelwell RC, Bond S, Hutchings N. Stress and coping in single handed around the world ocean sailing. J. Appl. Sport Psychol. 2009 21 460–74.

    Article  Google Scholar 

  6. 6

    Carskadon MA, Dement WC. Cumulative effects of sleep restriction on daytime sleepiness. Psychophysiology 1981 18 107–13.

    CAS  Article  PubMed  Google Scholar 

  7. 7

    Dinges DF, Kribbs NB. Performing while sleepy: effects of experimentally-induced sleepiness. In: Monk TH, ed. Sleep, Sleepiness and Performance. John Wiley & Sons: Chichester, 1991; 97–128.

    Google Scholar 

  8. 8

    Belenky G, Wesensten NJ, Thorne DR et al. Patterns of performance degradation and restoration during sleep restriction and subsequent recovery: a sleep dose-response study. J. Sleep Res. 2003 12 1–12.

    Article  PubMed  Google Scholar 

  9. 9

    Van Dongen HPA, Maislin G, Mullington JM, Dinges DF. The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation. Sleep 2003 26 117–26.

    PubMed  Google Scholar 

  10. 10

    Theunynck D, Hurdiel R, Pezé T, Estruch X, Bui-Xuân G. Sommeil et course au large en solitaire: comportements des coureurs et étude de faisabilité d’un agenda interactif de sommeil. Pistes, 12. [Cited 30 Nov 2011.] Available from URL: articles/v12n2a4.htm

    Google Scholar 

  11. 11

    Van Dongen HPA, Olofsen E, Dinges DF, Maislin G. Mixed-model regression analysis and dealing with inter-individual differences. Meth. Enzymol. 2004 384 139–71.

    Article  PubMed  Google Scholar 

  12. 12

    Lavie P. Ultra short sleep/wakening schedule. “Gates” and “forbidden zones” for sleep. Electroencephal. Clin. Neurophysiol. 1986 63 414–25.

    CAS  Article  Google Scholar 

  13. 13

    Borbély AA. A two process model of sleep regulation. Hum. Neurobiol. 1982 1 195–204.

    PubMed  Google Scholar 

  14. 14

    Kerkhof G. Transmeridian sailing. Mind Open Insights Psychol. 2009 4 4–5.

    Google Scholar 

  15. 15

    Van Dongen HPA, Dinges DF. Sleep debt and cumulative excess wakefulness. Sleep 2003 26 249.

    Google Scholar 

  16. 16

    McCauley P, Kalachev LV, Smith AD, Belenky G, Dinges DF, Van Dongen HPA. A new mathematical model for the homeostatic effects of sleep loss on neu-robehavioral performance. J. Theor. Biol. 2009 256 227–39.

    Article  PubMed  Google Scholar 

  17. 17

    Dinges DF, Pack F, Williams K et al. Cumulative sleepiness, mood disturbance, and psychomotor vigilance performance decrements during a week of sleep restricted to 4–5 hours per night. Sleep 1997 20 267–77.

    CAS  PubMed  Google Scholar 

  18. 18

    Van Dongen HPA, Baynard MD, Maislin G, Dinges DF. Systematic interindividual differences in neurobehav-ioral impairment from sleep loss: evidence of trait-like differential vulnerability. Sleep 2004 27 423–33.

    PubMed  Google Scholar 

  19. 19

    Van Dongen HPA, Caldwell JA, Caldwell JL. Investigating systematic individual differences in sleep-deprived performance on a high-fidelity flight simulator. Behav. Res. Methods 2006 38 333–43.

    Article  PubMed  Google Scholar 

  20. 20

    Axelsson J, Kecklund G, Åkerstedt T, Donofrio P, Lekander M, Ingre M. Sleepiness and performance in response to repeated sleep restriction and subsequent recovery during semi-laboratory conditions. Chronobiol. Int. 2008 25 297–308.

    Article  PubMed  Google Scholar 

  21. 21

    Leproult R, Colecchia E, Berardi AM, Stickgold R, Kosslyn SM, Van Cauter E. Individual differences in subjective and objective alertness during sleep deprivation are stable and unrelated. Am. J. Physiol. Regul. Integr. Comp. Physiol. 2003 284 R280–R290.

    CAS  Article  PubMed  Google Scholar 

  22. 22

    Van Dongen HPA, Caldwell JA, Caldwell JL. Individual differences in cognitive vulnerability to fatigue in the laboratory and in the workplace. Progr. Brain Res. 2011 190 145–53.

    Article  Google Scholar 

  23. 23

    Jackson ML, Van Dongen HPA. Cognitive effects of sleepiness. In: Thorpy MJ, Billiard M, eds. Sleepiness: Causes, Consequences and Treatment. Cambridge University Press: Cambridge, 2011; 72–81.

  24. 24

    Van Dongen HPA, Hursh SR. Fatigue, performance, errors, and accidents. In: Kryger MH, Roth T, Dement WC, eds. Principles and Practice of Sleep Medicine, 5th edn. Elsevier Saunders: St. Louis, MO, 2010; 753–9.

    Google Scholar 

  25. 25

    Horne J. Sleepiness as a need for sleep: when is enough, enough? Neurosci. Biobehav. Rev. 2010 34 108–18.

    Article  PubMed  Google Scholar 

  26. 26

    Van Dongen HPA, Belenky G. Model-based fatigue risk management. In: Matthews G, Desmond PA, Neubauer C, Hancock PA, eds. The Handbook of Operator Fatigue. Ashgate Publishing: Farnham (in press).

  27. 27

    Van Dongen HPA, Belenky G, Krueger JM. Investigating the temporal dynamics and underlying mechanisms of cognitive fatigue. In: Ackerman PL, ed. Cognitive Fatigue. American Psychological Association: Washington, DC, 2010; 127–47.

    Google Scholar 

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Correspondence to Dr Rémy Hurdiel.

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Hurdiel, R., Monaca, C., Mauvieux, B. et al. Field study of sleep and functional impairments in solo sailing races. Sleep Biol. Rhythms 10, 270–277 (2012).

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Key words

  • circadian rhythm
  • extreme conditions
  • fatigue risk management
  • neurobehavioral performance
  • single-handed offshore sailing races
  • sleep