Dictionary > Infradian rhythm

Infradian rhythm

Definition
noun, plural: infradian rhythms
A biological rhythm that is repeated longer than a 24-hour circadian day and therefore recurs over a longer period than a circadian rhythm
Supplement
Biological rhythms pertain to the synchronized cyclic pattern demonstrated by an organism as its response to a particular stimulus. Biological clock that synchronizes with biological rhythm may be endogenous or exogenous. An endogenous type is one in which the internal biological clock is the one that controls it. An exogenous type is one that which involves an external cue (i.e. zeitgeber). There are the different types of biological rhythms: circadian rhythms, diurnal rhythms, ultradian rhythms, and infradian rhythms.1
An infradian rhythm has a longer period than a circadian rhythm. The cycle is repeated more than the 24-hour circadian day. This is in contrast to the ultradian rhythm wherein it recurs in periods shorter than a day but longer than an hour.2 In infradian rhythm, the frequency is less than one cycle in 28 hours.3
Examples of an infradian rhythm include menstrual cycle, breeding, seasonal rhythms, etc.
See also:

Reference(s):

1 Hedge, A. (2013). Biological Rhythms. Retrieved from ://ergo.human.cornell.edu/studentdownloads/dea3250pdfs/biorhythms.pdf

2 “Ultradian, adj.” Oxford English Dictionary. Retrieved from ://www.oed.com.

3 Brown, F. M. & Graeber, R. C. (1982). The Rhythmic Aspects of Behavior. Hillsdale, NJ: Lawrence Erlbaum Associates. p.462.


You will also like...

The Human Physiology
The Human Physiology

Physiology is the study of how living organisms function. Thus, human physiology deals specifically with the physiologic..

Mātauranga Māori and Science Collaboration
Mātauranga Māori and Science

Mātauranga Māori is the living knowledge system of the indigenous people of New Zealand, including the relationships t..

Birth of a Human Baby
Birth of a Human Baby

Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..

Gene Regulation in Eukaryotes
Gene Regulation in Eukaryotes

Learn about the general structure of a eukaryotic gene, the transcription factors, and post-transcriptional regulation....

Adaptation Tutorial
Adaptation Tutorial

Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

Circulation
Circulation

The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

Related Articles...

No related articles found

See all Related Topics