Circadian - Rhythms that occur once every 24hrs, Infradian - Rhythms that occur less than once every 24 hrs i.e. need more than a day, weekly, monthly, yearly, Ultradian - Rhythms that occur more than once in a 24hr period, Biological rhythms - Cycles of activity that occur with some regularity, Sleep wake cycle - Example of a circadian rhythm, Sleep stages - Example of a ultradian rhythm, Menstrual cycle - Example of an infradian rhythm, Siffre - Cave study - 2 - 6 months underground a decade apart. Sleep wake cycle continued but went to a 25hr cycle., Aschoff and Weaver - Group of Ps spent 4 weeks in a bunker with no natural light most Ps rhythm was between 24 – 25 hours, 1 went to 29hrs, Folkard et al - 12 people lived in cave for 12 weeks going to bed when clock said 11.45pm and waking at 7.45 am. Researchers sped up clock. Only 1 person comfortably adjusted to new timing., Circannual - Rhythm that occurs once a year - a type of infradian rhythm,

Biological rhythms and circadian research

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