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Related Concept Videos

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
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Related Experiment Video

Updated: Aug 2, 2025

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
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Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

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Circadian Potency Spectrum in Light-Adapted Humans.

Martin Moore-Ede1,2, Anneke Heitmann1

  • 1Circadian Light Research Center, Stoneham, MA, USA.

Journal of Cell Science & Therapy
|April 17, 2023
PubMed
Summary

Nighttime light disrupts circadian rhythms and health. This study defines the human circadian system's spectral sensitivity in light-adapted conditions, enabling the creation of healthier lighting solutions.

Area of Science:

  • Chronobiology
  • Photobiology
  • Human Physiology

Background:

  • Light exposure at night disrupts cellular circadian timing, linked to various health disorders.
  • Previous studies on circadian sensitivity used dark-adapted conditions, which do not reflect typical human experience.
  • Understanding light-adapted spectral sensitivity is crucial for mitigating circadian disruption.

Purpose of the Study:

  • To define the precise spectral sensitivity of the human circadian system in a light-adapted state.
  • To develop a spectral engineering approach for lighting that minimizes circadian disruption at night.
  • To inform the design of lighting for both nocturnal protection and daytime circadian entrainment.

Main Methods:

  • Review of evidence from experiments using spectral filtering of light sources.
Keywords:
CircadianHumanLightSpectral Sensitivity

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  • Analysis of comparisons between light sources with diverse spectral power distributions.
  • Focus on light-adapted human responses, contrasting with previous dark-adapted studies.

    • Main Results:

    • Evidence supports a narrow blue circadian sensitivity curve for light-adapted humans.
    • This sensitivity function, termed the Circadian Potency function, is defined.
    • The findings are derived from real-world light exposure conditions.

    Conclusions:

    • The light-adapted Circadian Potency function is essential for developing circadian-protective lighting.
    • This function allows for the engineering of lighting to minimize negative health impacts of light at night.
    • It also enables the design of optimized lighting for enhancing circadian entrainment during the day.