SUMMARY
Circadian biorhythms change with age and such changes are caused by the loss of both the time and the
space structure. These alterations of biorhythms are associated with poor health and the end of life but we
do not know the extent to which they represent cell clock system injury. It seems that ageing of biorhythms
in mammals, i.e. including humans, is caused by the ability of suprachiasmatic nuclei to drive oscillations in
other tissues. Social synchronization extending photic stimuli, which diminishes during degeneration of
nerve and optic system, enhances the quality of life and therefore further studies of the influence of health
and social care systems on circadian rhythms could contribute to the lengthening of life.
KEY WORDS
ageing; rhythm; regulation; synchronizer; quality of life
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