Modeling the Effect of Days Underway and Environmental Motion on Crew Physical Activity on Naval Vessels
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Results from earlier research on crew activity onboard naval vessels suggest that personnel activity is a function of two components, time underway, and ship motion severity. Physical activity reduction was attributed to some combination of sopite syndrome and motion-induced fatigue. Although both stressors are a well-recognized problem in the naval environment, few studies have addressed them. Building on earlier findings, this work proposes a mathematical model to account for the effect of motion and days underway on the observed personnel physical activity. Model predictions are evaluated against a retrospective analysis of existing actigraphic recordings from three earlier projects in the naval operational environment. Analysis showed that the model predicts activity with a good approximation. These results further validated the effect of the days underway and motion component in predicting personnel activity. The observed reduction in physical activity may be a valuable surrogate indicator of sopite syndrome and motion-induced fatigue. Future research efforts should incorporate the effect of sleep, mission requirements, and the occupational component of crew physical activity.
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