Metabolic and Behavioural Long Period Ultradian Rhythms in Endotherms

  • M. Stupfel


We humans are much aware of a daily rhythm of behaviour. We wake up, wash, dress, breakfast, go to work or to accomplish a predetermined morning programme, then have lunch, perhaps go back home; after that comes dinner time and later on we go to bed and fall asleep. Of course this is not always at strictly regular times. Certain days there are variations in the schedule of occupation, weekends and holidays have many individualities. Seasons, weather, ageing and retirement modify ways of life. Some people are strict with time keeping, others are not. But the sequence of bed, breakfast, activity, lunch, activity, dinner, activity and bed are for many unavoidable, though, of course, at not regularly fixed times, but rather dependent on external current events. Furthermore, in a single day, we feel ourselves to be sometimes in a happy mood, for instance after good food, and sometimes depressed as a consequence of bad news. Even so we could have the sensation of rhythmic daily changes in humour, even independently of our psychological environment. Moreover, we know or rather we feel that, in a day, there are some kinds of hourly rhythms ruled by the clock; these have become societal cues in our busy lives. These cues have, for a long time, replaced the astronomical and solar light and dark signals that were originally the determinants of the activities of our forefathers. Time life tables of so-called “primitive” ethnic Australian and African people are still regulated by their temporal surroundings.


Circadian Rhythm Mean Arterial Blood Pressure Slow Wave Sleep Biological Rhythm Paradoxical Sleep 
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