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Interaction of chronic and acute effects: change in performance from the start of the extended duration work shift (Day 1 – 06:00-14:59) to the end of the extended duration work shift (06:00-14:59) mediated by the effects of each successive extended duration shift. Performance at the end of the shift shows greater chronic effects, whereas performance at the start of shifts remains relatively protected. Mean ± standard error of the mean reported,n = 34.
