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Chronobiology is a field of biology that examines periodic phenomena in living organisms and their adaptation to solar- and lunar-related rhythms. These cycles are known as biological rhythms. These are behaviour’s or developments that occur as part of a life cycle. Biological rhythms can be Internal (endogenous) that is controlled by the internal biological clock e.g. body temperature cycle and external (exogenous) which is controlled by synchronizing internal cycles with external stimuli e.g. sleep/wakefulness and day/night. Biological Rhythms are: Circadian rhythms which endogenously generated rhythms with a period close to 24 hours. Diurnal rhythms are a circadian rhythm that is synchronized with the day/night cycle. Ultradian rhythms are biological rhythms (e.g. feeding cycles) with a period much shorter (i.e., frequency much higher) than that of a circadian rhythm. Infradian rhythms are biological rhythms with a cycle of more than 24 hours (e.g. the human menstrual cycle).
Related Journals of Biological Rhythms
Molecular Histology & Medical Physiology, Anatomy & Physiology: Current Research, The Journal of Physiological Sciences, Circadian Physiology, Cardiovascular reactivity, stress, and physical activity.