Types of biological rhythms
Circadian rhythm - 24 hrs e.g. Core body temperature and sleep - wake cycle.
Ultradian rhythm- less than a day - cycles of sleep
Infradian rhythm- more than a day but less than a year e.g. menstrual cycle
Research Studies on Circadian rhythm
- Michel Siffre- French cave explorer. Spent 6 weeks in a cave and found that his natural circadian rhythm was 24 hrshoweveronsomeoccasionsthis varied to 48 hrs.
- Aschoff and Wever-Participants in a world war 2 underground bunker and found that they displayed normal circadian rhythm of 24 hrs
- Folkard- 12 groups of ppts placed in a temporalisolationunit