body clock


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body clock

n.
An internal mechanism of the body that is thought to regulate physical and mental functions in rhythm with normal daily activities.

circadian rhythm

physiological variations over 24 h, generated by a 'clock' in the brain (nerve centres in the hypothalamus, with input from the eyes); normally synchronized to the light-dark cycle, but effective even in conditions without cues from light or time. Influenced by the hormone melatonin from the pineal gland. Circadian means 'about a day'. Variables affected include body temperature, alertness and sleepiness, urine output, cortisol secretion. See also jet lag.
References in periodicals archive ?
He added that people often think of themselves as a "slave" to their body clocks and are programmed to wake up early or late.
The mutants were unable to synchronize their body clocks to a series of challenging light/dark cycles -- for example, 10.
Sky, BT Sport and the BBC are leading us to the darker hours of the day, but with the chance of resetting our body clock, life without sunshine could indeed be magical.
The good news is - with the aid of some simple expert tricks - not only can you ease your body clock back into your normal routine, but you can also sleep better than ever.
Getting enough exposure to outdoor light in the morning and then enjoying plenty of darkness at night should ensure your body clock resets itself daily, helping you to sleep better and avoid those dips in mood and the appetite changes associated with SAD.
The study concluded that the body clock is likely to be disturbed when flying across time zones and this can affect levels of the hormone melotonin.
The light from Re-Timer stimulates the part of the brain responsible for regulating the 24-hour body clock," the Daily Mail quoted Professor Lack from Flinders University in Adelaide, South Australia, as saying.
They are the normal consequences of having the body clock out of sync.
The way we feel and behave at any particular time is influenced by our bodily rhythms which, in turn, are governed by our body clock .
Until your body clock adjusts, it may be more difficult to fall asleep at the desired clock time and be more difficult to get up in the morning because it's now earlier than in DST," says Hartse.
This "day" length causes havoc with the internal 24-hour body clock but researchers at Brigham and Women's Hospital (BWH) have developed and tested a fatigue management program which is successful at controlling this space-age jetlag.
The risk almost quadrupled if they were early bird types - possibly because they are more susceptible to body clock disruption, said the study.