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...

Electromagnetic spectrum of a brain
Sleep and Dreams – Neurology

While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..

Protein (illustration)
Protein Variety

The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

Biological Viruses
Biological Viruses

Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...

human respiratory system
Respiration

The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

primitive arthropods
Arthropods

The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..

Physiological Homeostasis
Physiological Homeostasis

Homeostasis is essential to maintain conditions within the tolerable limits. Otherwise, the body will fail to function p..

Related Articles...

No related articles found

See all Related Topics