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Discuss research into biological rhythms (8+16)

Research into circadian rhythms has assessed the effects of isolating participants from their external
time cues (exogenous zietgebers) on our 24 hour cycles, and suggesting that an internal body clock
(endogenous pacemaker) creates a free-running cycle of 25 hours.
For example, Siffre reported a…

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Without further high quality research on the differences between people's cycles, our knowledge is
limited and applications may be useless or harmful to those who don't have a `typical' cycle.

Alternatively, infradian rhythms repeat themselves over a greater period of time- rhythms that las
longer for a day, such as…

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