Biological Rhythms

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  • Created on: 30-12-13 10:32
The three types of biological rhythms
circadian, infradian, ultradian
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Occur every 24 hours E.G: sleep-wake cycle
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Occur less frequently than once daily E.G: menstrual cycle
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Occur more than once daily E.G: sleep cycle (stages of sleep)
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Endogenous Pacemakers: Internal Clock
SCN acts as internal clock to keep body on 24 hour sleep-wake cycle
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Endogenous Pacemakers: Melatonin
When there is light its released thus inducing sleep and vice versa
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Exogenous Zeitgebers
light, Siffre 6months in a cave, sleep-wake extended to 25-30 hours due to no light
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Pengelly and Fisher: Support for endogenous
Squirrels hibernate in lab conditions due to hibernation being endogenous
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Humans: Support for exogenous
humans adapt to their environment and are able to stay awake when necessary
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Disrupting biological rhythms
jet lag, shift work
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Disrupting biological rhythms: Jet lag
change in time zone leaves you out of sync, Schwartz found teams travelling east to west got better results than the other way round
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Disrupting biological rhythms: Shift work
mixing up of the rhythms, czeisler studies workers whos shift patterns caused health problems, changes were made to allow more time to adapt(IDA)
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Research limitations
animal studies, deprived of natural light studies still use artificial light, individual differences,
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Occur every 24 hours E.G: sleep-wake cycle

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Endogenous Pacemakers: Internal Clock


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