Abstract
Circadian rhythmicity is of endogenous origin, that is, it is generated within every organism without needing the input of day-night stimuli. Its period is usually close to but not precisely 24 hr. In humans, the free-running period is typically about 25 hr. In fact, in most experiments all rhythms run in synchrony (“internally synchronized”). In a minority of experiments (i.e., 52 experiments to date), the period of about 25 hr is present only in some physiological rhythms (e.g., deep body temperature), whereas the sleep-wake rhythm and other rhythms run with considerably deviating periods (i.e., between 12 and 65 hr) and the rhythms are described as “internally desynchronized.”
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Wever, R.A. (1992). Circadian Rhythmicity of Man Under the Influence of Weak Electromagnetic Fields. In: Moore-Ede, M.C., Campbell, S.S., Reiter, R.J. (eds) Electromagnetic Fields and Circadian Rhythmicity. Circadian Factors in Human Health and Performance. Birkhäuser Boston. https://doi.org/10.1007/978-1-4684-6799-4_8
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DOI: https://doi.org/10.1007/978-1-4684-6799-4_8
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