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Light effects on circadian rhythm are the effects that light has on circadian rhythm. Most animals and other organisms have "built-in clocks" in their brains that regulate the timing of biological processes and daily behavior. These "clocks" are known as circadian rhythms. They allow maintenance of these processes and behaviors relative to the 24-hour day/night cycle in nature. Although these rhythms are maintained by the individual organisms, their length does vary somewhat individually. Therefore, they must, either continually or repeatedly, be reset to synchronize with nature's cycle. In order to maintain synchronization ("entrainment") to 24 hours, external factors must play some role. The human circadian rhythm occurs typically in accordance with nature's cycle. The average activity r

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  • Light effects on circadian rhythm (en)
  • Cirkadiskt ljus (sv)
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  • Light effects on circadian rhythm are the effects that light has on circadian rhythm. Most animals and other organisms have "built-in clocks" in their brains that regulate the timing of biological processes and daily behavior. These "clocks" are known as circadian rhythms. They allow maintenance of these processes and behaviors relative to the 24-hour day/night cycle in nature. Although these rhythms are maintained by the individual organisms, their length does vary somewhat individually. Therefore, they must, either continually or repeatedly, be reset to synchronize with nature's cycle. In order to maintain synchronization ("entrainment") to 24 hours, external factors must play some role. The human circadian rhythm occurs typically in accordance with nature's cycle. The average activity r (en)
  • Cirkadiskt ljus är en term för ljusets effekter på den cirkadiska rytmen. Mer specifikt används termen för ljus som anpassar sig efter dygnsrytmen. Cirkadiska rytmen, även kallat dygnsrytm, är en biologisk klocka som återfinns i hjärnan hos ett stort antal djur och organismer. Den biologiska klockan reglerar det dagliga beteendet och styr ett antal processer/kroppsfunktioner som ämnesomsättning, hormonnivå, födointag, kroppstemperatur och växling mellan vila och aktivitet. Den mänskliga cirkadiska rytmen förhåller sig naturligt till naturens 24-timmars dag-/nattcykel. Den genomsnittliga dygnsrytmen har en periodlängd på 24.18 timmar, men varierar beroende på individ och anpassas bland annat efter intryck från omgivningen, även kallat zeitgebers. (sv)
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  • Light effects on circadian rhythm are the effects that light has on circadian rhythm. Most animals and other organisms have "built-in clocks" in their brains that regulate the timing of biological processes and daily behavior. These "clocks" are known as circadian rhythms. They allow maintenance of these processes and behaviors relative to the 24-hour day/night cycle in nature. Although these rhythms are maintained by the individual organisms, their length does vary somewhat individually. Therefore, they must, either continually or repeatedly, be reset to synchronize with nature's cycle. In order to maintain synchronization ("entrainment") to 24 hours, external factors must play some role. The human circadian rhythm occurs typically in accordance with nature's cycle. The average activity rhythm cycle is 24.18 hours in adulthood but is shortened as age increases. One of the various factors that influence this entrainment is light exposure to the eyes. When an organism is exposed to a specific wavelength of light stimulus at certain times throughout the day, the hormone melatonin is suppressed, or prevented from being secreted by the pineal gland. (en)
  • Cirkadiskt ljus är en term för ljusets effekter på den cirkadiska rytmen. Mer specifikt används termen för ljus som anpassar sig efter dygnsrytmen. Cirkadiska rytmen, även kallat dygnsrytm, är en biologisk klocka som återfinns i hjärnan hos ett stort antal djur och organismer. Den biologiska klockan reglerar det dagliga beteendet och styr ett antal processer/kroppsfunktioner som ämnesomsättning, hormonnivå, födointag, kroppstemperatur och växling mellan vila och aktivitet. Den mänskliga cirkadiska rytmen förhåller sig naturligt till naturens 24-timmars dag-/nattcykel. Den genomsnittliga dygnsrytmen har en periodlängd på 24.18 timmar, men varierar beroende på individ och anpassas bland annat efter intryck från omgivningen, även kallat zeitgebers. Ljus är kanske den zeitgeber som har störst effekt på den cirkadiska rytmen. Människan är en dagsaktiv art och ljus hjälper till att synkronisera den naturliga dygnsrytmen i kroppen. Ljus stimulerar ljuskänsliga nervceller i näthinnan som skickar signaler/information genom tractus retino hypothalamicus till dygnsrytmskärnan. Dygnsrytmkärnan, nucleus suprachiasmaticus (SCN), påverkar talgkörtelns utsöndring av melatonin, vilket styr kroppens vakenhetsnivå och gör att människan känner sig sömnig. (sv)
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