Circadian Rhythmicity of Man Under the Influence of Weak Electromagnetic Fields

  • Rütger A. Wever
Part of the Circadian Factors in Human Health and Performance book series (CFHH)


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.”


Melatonin Secretion Field Alternation Temperature Rhythm Constant Environmental Condition Deep Body Temperature 


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© Birkhäuser Boston 1992

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  • Rütger A. Wever

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