Look up ultradian in Wiktionary, the free dictionary. In chronobiology, an ultradian rhythm is a recurrent period or cycle repeated throughout a 24-hour...

rhythms. In contrast, ultradian rhythms have periods shorter than the period of a circadian rhythm. Several infradian rhythms are known to be caused...

phase with other circadian or ultradian rhythms such as metabolic, hormonal, CNS electrical, or neurotransmitter rhythms. Recent research has influenced...

cycles in many plants and animals, or the human menstrual cycle. Ultradian rhythms, which are cycles shorter than 24 hours, such as the 90-minute REM...

to occur during both sleep and wakefulness. Empirically, it is an ultradian rhythm of approximately 90 minutes (80–120 minutes) characterized by different...

slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from...

Linthorst, ACE (2008). "Corticosterone Levels in the Brain Show a Distinct Ultradian Rhythm but a Delayed Response to Forced Swim Stress". Endocrinology. 149 (7):...

degradation – Stomach cancer – Triage – Ultradian rhythm - Urea cycle – Zygote Bioelectricity – Circadian rhythm – Consciousness – Electroencephalography...

cycles in many plants and animals, or the human menstrual cycle. Ultradian rhythms, which are cycles shorter than 24 hours, such as the 90-minute REM...

contributes to the ultradian rhythm of TSH concentration with about 10 pulses per 24 hours. The amplitude of the circadian and ultradian rhythms is reduced in...