disrupting biological rhythms

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  • Created by: Molly
  • Created on: 26-11-12 14:33
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  • disrupting biological rhythms
    • shift work
      • some people can suffer so badly from the disruption of circadian rhythms caused by shift work that they are listed as a sleep disorder
        • many shift workers are operating machinery or making decisions at times when their internal body clock is completely out of synchorisation with the external world
        • fatigue, depression and illness
        • our body clock prepares us for sleep when it is dark and particularly between 2am and 4am.
          • chernobyl nuclear explosion occured during this phase of shift work.
        • workers on shifts have to try and sleep during the day. inturupted by sunlight, and missing out on family activities.
        • CZEISLER, MOORE-EDE AND COLEMAN (1982) phase delay and phase advance.
      • these problems did not exist until last century, when Edison invention of the electric light.
        • the electric light has transformed modern society, we can now work and shop 24 hours a day.
      • The traditional pattern would be divided into three eight hour periods: midnight to 8am, 8am to 4pm and 4pm to midnight. shifts would change at intervals of one week with backwards rotation.
      • coping with shift work
        • permanent non roatating shift work.
        • planned napping during shifts. (not very popular though)
        • improved sleep during the day
        • rapid rotation
    • jet lag
      • if you leave the UK at 10 am and fly to new york you arrive around six hours later, your body clock tells you its 4pm but its actually 11am.
      • the dislocation between the body clock and local zeitgebers can lead to jet lag.
        • leads to feelings or tiredness and confusion
        • our sleep wake body clock is reset by the light of morning in order to keep a 24 hour rhythm.
        • body temperature may also be disrupted and become desynchronised form the sleep wake cycle, adds to general feeling of disorientation.
      • various factors can affect the severity of jet lag:
        • direction of travel
        • number of time zones crossed
        • age: jet lag decreases with age
        • individual differences
      • reducing jet lag
        • sleep well before the flight, adjust flight behaviour, adjust to local zeitgebers, get up early as possible.
  • the dislocation between the body clock and local zeitgebers can lead to jet lag.
    • leads to feelings or tiredness and confusion
    • our sleep wake body clock is reset by the light of morning in order to keep a 24 hour rhythm.
    • body temperature may also be disrupted and become desynchronised form the sleep wake cycle, adds to general feeling of disorientation.
  • number of time zones crossed

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