This word comes from the Latin for ‘about a day’.
The sleeping waking cycle involves one period of each in 24 hours
Our body temperature has one peak (in the afternoon) and one trough (in the early morning) in the same period
This is a 24 hour rhythm
What are four things which have some variation over 24 hours?
Answer
1. heart rate
2. breathing
3. metabolic
4. body temperature
All the above reach maximum values in late pm/early evening and minimum values in the early hours of the morning
Why?
Answer
We are active during the day and inactive at night
These rhythms persist if we suddenly reverse our activity patterns.
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