Circadian Rhythms

staves which structure our daily routines is the sleep-wake rung, an example of an endogenously holdled rhythm. This has been established by observations of organisms unploughed in constant environmental conditions. These studies come shown that even without the define of exogenous zeitgebers, circadian rhythms continue with little disruption. One such psychologist Michael Siffre worn-out(a) long periods of time living underground to subscribe his own biological rhythm, with no escaped or pin clover to indicate the time. After 61 solar days in the southern Alps, he resurfaced in September, but thought it was August. This is an example of his congenital circadian rhythm settling down to a systematic rhythm, suggesting that circadian rhythms persist despite the isolation from natural light.
search to support Siffres study comes from Aschoff et al. In one of their studies, participants spent a month living in specially versed underground laboratories whereby they were shielded from any external influences. Results showed that although the participants kept a regular cycle of activity confirming the idea of an inhering biological clock, after 2 weeks, they were half a day out of synchrony because our bodys natural rhythm is 25 hours. Moreover, after one day of not knowing the time, they went to bed an hour later each consecutive day.



This demonstrates that whilst the sleep-wake cycle is maintained by endogenous control, it becomes free running i.e. it is not bound to the 24 hour light-dark cycle. Studies such as these extend evidence to suggest that despite isolation from natural light (the main exogenous zeitgebers) circadian rhythms maintained a jolly constant timing, thus suggesting there are internal mechanisms which control the circadian rhythms, now referred to as endogenous pacemakers.
However, studies like Michaels which have used very few or even whizz participants mean that we can only generalise the findings with great wish because his bodys behaviour may not be...If you extremity to get a full essay, order it on our website: Orderessay



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