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  2. Constant routine protocol - Wikipedia

    en.wikipedia.org/wiki/Constant_routine_protocol

    For example, it has been demonstrated previously that sleep deprivation itself has an effect on heart rate rhythms as measured by EEG. [9] In addition, it has been suggested that sleep deprivation and the constant routine protocol may themselves effect the circadian phase of the participant, based on research done in hamsters.

  3. 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).

  4. Phase response curve - Wikipedia

    en.wikipedia.org/wiki/Phase_response_curve

    Phase response curves for light and for melatonin administration. In humans and animals, there is a regulatory system that governs the phase relationship of an organism's internal circadian clock to a regular periodicity in the external environment (usually governed by the solar day).

  5. Ultradian rhythm - Wikipedia

    en.wikipedia.org/wiki/Ultradian_rhythm

    However, this appears to be the first harmonic of the circadian rhythm of each and not an endogenous rhythm with its own rhythm generator. Other ultradian rhythms include blood circulation, blinking, pulse, hormonal secretions such as growth hormone, [3] heart rate, thermoregulation, micturition, bowel activity, nostril dilation, appetite, and ...

  6. Biological clock - Wikipedia

    en.wikipedia.org/wiki/Biological_clock

    Circadian rhythm, biological process that displays an oscillation about 24 hours, such as the human sleep-wake cycle (the "body clock") Epigenetic clock, a set of DNA sites whose methylation levels can be used to measure aging throughout the body; Molecular clock, a technique that uses the mutation rate of a biomolecule to deduce the time in ...

  7. Circadian rhythm sleep disorder - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm_sleep...

    A circadian rhythm is an entrainable, endogenous, biological activity that has a period of roughly twenty-four hours. This internal time-keeping mechanism is centralized in the suprachiasmatic nucleus (SCN) of humans, and allows for the internal physiological mechanisms underlying sleep and alertness to become synchronized to external environmental cues, like the light-dark cycle. [4]

  8. Delayed sleep phase disorder - Wikipedia

    en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

    Delayed sleep phase disorder (DSPD), more often known as delayed sleep phase syndrome and also as delayed sleep–wake phase disorder, is the delaying of a person's circadian rhythm (biological clock) compared to those of societal norms.

  9. Heart rate monitor - Wikipedia

    en.wikipedia.org/wiki/Heart_rate_monitor

    A heart rate monitor (HRM) is a personal monitoring device that allows one to measure/display heart rate in real time or record the heart rate for later study. It is largely used to gather heart rate data while performing various types of physical exercise. Measuring electrical heart information is referred to as electrocardiography (ECG or EKG).

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