Ultradian rhythms: the cycles of life

Subject: Environment

Section: Climate change

Ultradian rhythm:

Life on Earth is sustained by various biological cycles, among which the ultradian rhythm is a key cyclic process observed in all living organisms, from single-celled entities to humans.
Unlike circadian rhythms that operate on a 24-hour cycle, like the sleep-wake pattern, ultradian rhythms occur more frequently, within less than a 24-hour period.
- Ultradian rhythm refers to cycles with a period shorter than a day but longer than an hour.
These rhythms are responsible for governing essential physiological functions such as heartbeat, breathing, hormonal releases, and brain-wave activity, thus playing a crucial role in maintaining the health and well-being of organisms.
A well-known example of an ultradian rhythm is the sleep cycle, which involves alternating periods of rapid eye movement (REM) and non-REM sleep throughout the night.
Each cycle lasts about 90 minutes, with REM sleep associated with dreaming and non-REM sleep being important for physical restoration and memory consolidation.
Moreover, ultradian rhythms regulate the pulsatile secretion of hormones like growth hormone, cortisol, and insulin, which are vital for metabolism regulation, energy levels, and stress response management.

Source: TH