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  2. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    The researchers suspect that other Arctic animals as well may not show circadian rhythms in the constant light of summer and the constant dark of winter. [53] A 2006 study in northern Alaska found that day-living ground squirrels and nocturnal porcupines strictly maintain their circadian rhythms through 82 days and nights of sunshine. The ...

  3. Chronobiology - Wikipedia

    en.wikipedia.org/wiki/Chronobiology

    Overview, including some physiological parameters, of the human circadian rhythm ("biological clock"). Chronobiology is a field of biology that examines timing processes, including periodic (cyclic) phenomena in living organisms, such as their adaptation to solar- and lunar-related rhythms. [1] These cycles are known as biological rhythms.

  4. Morningness–eveningness questionnaire - Wikipedia

    en.wikipedia.org/wiki/Morningness–eveningness...

    A study in 2009 examined differences between evening and morning types in the timing of melatonin and core body temperature rhythms as well as objective and subjective sleepiness rhythms in a controlled laboratory protocol. The evening types had significantly later timed rhythms for all these variables, particularly that of maximum alertness ...

  5. This Is The Optimal Time To Go On A Walk, According To ...

    www.aol.com/lifestyle/optimal-time-walk...

    This is because it potentially helps regulate your circadian rhythm. ... Body composition, according to the aforementioned 2023 study, as well as a separate study in Obesity.

  6. Zeitgeber - Wikipedia

    en.wikipedia.org/wiki/Zeitgeber

    A zeitgeber (/ ˈ (t) s aɪ t ɡ eɪ b ər, ˈ z aɪ t-/ (T)SYTE-gay-bər, ZYTE-, German: [ˈtsaɪtˌɡeːbɐ]) is any external or environmental cue that entrains or synchronizes an organism's biological rhythms, usually naturally occurring and serving to entrain to the Earth's 24-hour light/dark and 12-month cycles.

  7. Chronotype - Wikipedia

    en.wikipedia.org/wiki/Chronotype

    PER2 is a well-known regulator of circadian rhythms and contains a variant recently shown to be associated with iris formation. This suggests a link between iris function and chronotype. This suggests a link between iris function and chronotype.

  8. Biorhythm (pseudoscience) - Wikipedia

    en.wikipedia.org/wiki/Biorhythm_(pseudoscience)

    The numbers from +100% (maximum) to -100% (minimum) indicate where on each cycle the rhythms are on a particular day. In general, a rhythm at 0% is crossing the midpoint and is thought to have no real impact on one's life, whereas a rhythm at +100% (at the peak of that cycle) would give one an edge in that area, and a rhythm at -100% (at the ...

  9. Circannual cycle - Wikipedia

    en.wikipedia.org/wiki/Circannual_Cycle

    These rhythms are influenced by variable environmental cues, and in some species are influenced by internal cues. In a study conducted by Catalina Reyes, the authors took a further look into how red-eared sliders showed circadian and circannual rhythms in metabolism, and if metabolic rates overall influenced the circadian and circannual cues.