CIRCADIAN AND ULTRADIAN RHYTHMS IN THE FEEDING-BEHAVIOR AND NUTRIENT INTAKES OF OIL REFINERY OPERATORS WITH SHIFT - WORK EVERY 3 - 4 DAYS

  • 1 January 1979
    • journal article
    • research article
    • Vol. 5  (1) , 33-41
Abstract
Healthy adult men (7), 5 shift-workers and 2 non-shift-workers (from 21-36 yr; mean = 26.4) volunteered to record what and when they ate, both at work and at home, every day, during consecutive weeks (Oct.-Dec. 1974). All the subjects maintained the timing of main-meal (lunch and supper) during all shifts. The major intake of protein and lipid was concentrated on the 2 main meals during all shifts. Only the pattern of carbohydrate intake was modified by the shift-work: e.g., night-shift was associated with nibbling behavior. Shift-work and in particular the occurrence of nibbling behavior did not result in change in the mean 24 h caloric intake, or in the percentage of protein calories. The comparison between the constancy of timing of major meals and shift of the timing of circadian rhythm acrophases of the 5 shift-workers leads to the conclusion that meal timing apparently had a poor synchronizing effect, if any.

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