Ultradian Rhythms in Physiology and Behavior
Hartmut Schulz, Peretz Lavie
Springer, Jan 1, 1985 - Insomnie - 340 pages
Historical Perspective In 1842, in a paper entitled "Further Development of a General Law of Vital Periodicity", which was part of a series of seven Lancet papers on periodicities in health and disease, Thomas Laycock wrote: "As everything finite must have a period within which its existence is circumscribed, so every period so circumscribing the finite, being a measure of time, must be divisible into lesser periods. But it has always been found easier to reason from generals to particulars than to ascend from particulars to generals, especially in questions in volving the phenomena of life" (p. 423). From a historical perspec tive, Laycock's insight indeed anticipated the progress of chronobio logic research. In spite of the abundant evidence pointing at the existence of short-term rhythms with periodicities much shorter than 24 hours, termed "ultradian" rhythms after Halberg (1964), it has gen erally been found much easier to investigate circadian rather than uI tradian rhythms. In m~st cases, ultradian rhythms have been ignored, or dismissed as insignificant phenomena, even in cases where they could be easily "eyeballed" in the data. Laycock himself believed that the most basic periodicity in vital phenomena was 12 hours. Short-term fluctuations in the levels of certain behaviors, which could not be accounted for by external stimulation or by internal stimuli, have been known to ethologists and other observers of animal behavior for many years.
14 pages matching rhythmicity in this book
Results 1-3 of 14
What people are saying - Write a review
We haven't found any reviews in the usual places.
E Knobil and J Hotchkiss
F Kimura C Praputpittaya N Mitsugi R Hashimoto
14 other sections not shown
a l l amp litude analysis ASCH0FF awakening behavioral biorhythm BRAC Chap circadian rhythms circadian system common vole components cond it ions cort isol costerone cycle length DAAN daytime dian DRN discharge duration entrained experimental fluctuations frequency function GnRH gonadotrop H0 NMA HONMA intervals KLE ITMAN KRIPKE LAW IE lertness lesions limit cycle locomotor activity locomotor burst mechanism modulation monkey MSEs naps neurons night normal NREM oscillator osmol osmol a lity pacemaker patterns peak performance period i city phase relationship Physiol physiological plasma cort pulsatile rapid eye movement rats recorded REM cycle REM episode REM sleep REM-NREM cycle rhesus monkey rhythmic secretory showed significant sleep and wakefulness sleep cycle sleep deprivation sleep episodes sleep onset sleep stages sleep–wake cycle spectral spikes STERMAN subjects super imposed synchronized temporal tion tradian ultradian rhythms urine variables variations vole ZULLEY