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  2. Biorhythm (pseudoscience) - Wikipedia

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

    The biorhythm theory is the pseudoscientific idea that peoples' daily lives are significantly affected by rhythmic cycles with periods of exactly 23, 28 and 33 days, [2] [3] [4] typically a 23-day physical cycle, a 28-day emotional cycle, and a 33-day intellectual cycle.

  3. Biological rhythm - Wikipedia

    en.wikipedia.org/wiki/Biological_rhythm

    Ultradian rhythms, which are cycles shorter than 24 hours, such as the 90-minute REM cycle, the 4-hour nasal cycle, or the 3-hour cycle of growth hormone production. Tidal rhythms, commonly observed in marine life, which follow the roughly 12.4-hour transition from high to low tide and back. Lunar rhythms, which follow the lunar month (29.5 ...

  4. Chronobiology - Wikipedia

    en.wikipedia.org/wiki/Chronobiology

    Ultradian rhythms, which are cycles shorter than 24 hours, such as the 90-minute REM cycle, the 4-hour nasal cycle, or the 3-hour cycle of growth hormone production. [citation needed] Tidal rhythms, commonly observed in marine life, which follow the roughly 12.4-hour transition from high to low tide and back.

  5. List of cycles - Wikipedia

    en.wikipedia.org/wiki/List_of_cycles

    Alternation of generations – Beta oxidation – Bioelectricity – Biological pest control – Biological rhythm – Bipolar disorder – Cardiopulmonary resuscitation – Calvin–Benson cycle – Cell cycle – Chronobiology – Citric acid cycle – Circadian rhythm – Clinical depression – Digestion – Ecology – Feedback – Infradian rhythm - Life cycle – List of biochemistry ...

  6. File:Biorhythm-EN.svg - Wikipedia

    en.wikipedia.org/wiki/File:Biorhythm-EN.svg

    The biorhythms graph shows the basic cycles, physical (23 days), emotional (28 days) and intellectual (33 days), from the day of the person's birth. Spanish La gráfica de los biorritmos muestra los ciclos básicos, físico (23 días), emocional (28 días) e intelectual (33 días), desde el día de nacimiento de la persona.

  7. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment).

  8. Biorhythm - Wikipedia

    en.wikipedia.org/wiki/Biorhythm

    Biorhythm may refer to: Biorhythm (pseudoscience) , developed by Wilhelm Fliess in the 19th century Biological rhythm , repetitive cycles that occur in biology, studied in the science of chronobiology

  9. 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.