Biological Rhythms and Sleep Revision Table

I got the summary work from another young ******* here, but I have made it into a revision table - I hope it helps someone!

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  • Created on: 12-05-14 11:43
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Biological Circadian Infradian U
Rhythms
l
t
r
a
d
i
a
n
A circadian rhythm lasts for 24 hours. An An infradian rhythm A
AO1 example of this is the sleep-wake cycle. lasts for more than 24 n
hours but less than a u
Temporal isolation studies provide us with a year. An example of this lt
picture of the free-running circadian rhythm is the menstrual cycle. r
and demonstrates that the cycle persists a
despite the absence of light. Michael Siffre The menstrual cycle is d
spent long periods in a cave with no controlled mainly by i
exogenous zeitgebers (light etc.) He found hormones (oestrogen a
that his sleep-wake cycle generally adjusted and progesterone and is n
to a 24 hour cycle yet sometimes changed. a 28 day cycle but can r
This study is also supported by Aschoff & vary between 20-60 h
Wever who placed participants in an days. y
underground bunker, the participants cycle t
was 24-25 hours. However the control of h
the menstrual cycle may m
Cycles can be entrained (brought into phase) not be down to
to some extent by external cues. Folkard et al hormones alone: some l
reduced participants circadian rhythms using external cues have been a
a quickening clock but at 22 hours the found to affect the s
participants own rhythms took over again cycle. Reinberg: a t
woman in a cave for 3 s

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Russell et r
al found that l
pheromones e
(biochemical s
Our core body temperature is lowest at substances that act like s
about 4.30AM (36°c) & highest at about hormones but are t
6.00PM (38°c). Folkard et al tested memory released into the air) h
recalls in children and the results were better can have the effect of a
when temperature was higher.…read more

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Seasonal affective t
disorder (SAD) makes h
sufferers depressed in e
winter. Research studies sl
have found that the e
hormones melatonin e
and serotonin are p
secreated when it is dark s
therefore the more t
darkness, the more a
hormones and this can g
cause chronic e
depression.…read more

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W
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R
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Comments

Fatema.ali

This is THE best, thank you!

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