• Int Marit Health · Jan 2009

    Comparative Study

    Comparison of alertness levels in ship crew. An experiment on rotating versus fixed watch schedules.

    • Shalini Arulanandam and Gregory Chan Chung Tsing.
    • Navy Medical Service, Republic of Singapore Navy.
    • Int Marit Health. 2009 Jan 1; 60 (1-2): 6-9.

    AbstractA short pilot study was conducted during a shipboard training deployment to compare alertness levels in the same crew members while working a fixed watch schedule, and then a rotating watch schedule. Alertness levels were assessed before and after each duty watch using measurements of oculomotor function (Fitness Impairment Tester). Saccadic velocity was shown to have the greatest correlation with duration of sleep deprivation and was significantly slower (indicating decreased alertness) in the crew working the rotating watch schedule than the crew working the fixed watch schedule. This pilot study corroborates previous studies' recommendations that fixed watch schedules allow better acclimatization of sleep patterns, thus minimizing fatigue and increasing operational alertness.

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