ultradian

[ uhl-trey-dee-uhn ]

adjective

, Physiology.

1. of or relating to a biorhythm or regular biological cycle having a period of less than 24 hours, such as the movement of blood through the circulatory system. Compare circadian ( def ), infradian ( def ).

Word History and Origins

Origin of ultradian¹

First recorded in 1960–65; ultra- ( def ) + Latin di(ēs) “day” + -an ( def )

Example Sentences

"This tiny, soft device takes the form of a smooth, round capsule that rests within the GI system, without affecting natural physiological processes for long-term recordings. The data show some very unique signatures, in the form of perturbations to natural circadian cycles, known as ultradian rhythms, as early indications of inflammatory responses."

From Science Daily

The scientists discovered that the ultradian temperature rhythms correlate to cyclic variations in stress levels and inflammatory markers in blood, said Surabhi Madhvapathy, co-first author from Rogers group who led the sensor engineering.

From Science Daily

Scientists believe this is because the current treatment does not mimic the body's normal physiological timing, missing cortisol's anticipatory rise and lacking its underlying ultradian and circadian rhythms.

From Science Daily

A first-of-its kind hormone replacement therapy that more closely replicates the natural circadian and ultradian rhythms of our hormones has shown to improve symptoms in patients with adrenal conditions.

From Science Daily

The ultradian cycle determines the timing of the dreams, which could be expected every 90 minutes.

From Salon