Dim Light Melatonin Onset
Dim Light Melatonin Onset - Related Videos
12:02
Human Primary Trophoblast Cell Culture Model to Study the Protective Effects of Melatonin Against Hypoxia/reoxygenation-induced Disruption
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Cited by 34 •
2016
This manuscript presents a unique in vitro model of immunopurified human villous cytotrophoblast cells cultured under hypoxia/reoxygenation. This model is suitable to study the protective effects of promising treatments, such as melatonin, on pregnancy complications associated with increased oxidative stress and altered placental function.
08:51
The Use of Thermal Infra-Red Imaging to Detect Delayed Onset Muscle Soreness
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Cited by 110 •
2012
The purpose of this investigation was to assess whether using an infra-red thermal camera is a valid tool for detecting and quantifying the muscle soreness after exercising.
09:59
A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia
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Cited by 17 •
2017
A protocol for stroke onset time estimation in a rat model of stroke exploiting quantitative magnetic resonance imaging (qMRI) parameters is described. The procedure exploits diffusion MRI for delineation of the acute stroke lesion and quantitative T1 and T2 (qT1 and qT2) relaxation times for timing of stroke.
08:35
Introduction to Light Microscopy
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2023
The light microscope is an instrument used by researchers in many different fields to magnify specimens to as much as a thousand times their original size. In its simplest form, it is composed of a clear lens that magnifies the sample and a light source to illuminate it. However, most light microscopes are much more complex and house numerous fine-tuned lenses with tightly controlled dimensions all within the body of the microscope itself and in components such as the objectives and eyepieces.
02:12
The Wave Nature of Light
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2020
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion. Others in the...
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Under controlled low-light conditions, researchers reduce light-induced suppression of melatonin. This allows the evening rise to be observed more reliably rather than being masked or reduced by environmental illumination. The lighting condition is therefore a measurement requirement, not merely a laboratory convenience, because it protects the signal used to estimate circadian phase.
Researchers compare serial melatonin measurements with an established threshold and look for the first increase that remains sustained. Requiring persistence helps distinguish a meaningful biological rise from a temporary fluctuation in one sample. The resulting clock time provides a consistent reference point for comparing circadian timing across individuals or experimental conditions.
DLMO timing helps estimate when an individual’s internal circadian system is positioned relative to the evening. In behavioral research, that information contributes to assessment of chronotype and sleep timing. Comparing the marker with a person’s daily schedule can also show whether preferred or actual sleep timing is aligned with internal biological timing.
Researchers collect serial saliva or blood samples during the evening while participants remain under dim light. They then examine the sequence of melatonin values, apply an established threshold, and identify the first sustained increase. This repeated-sampling workflow links a physiological signal to a clock time while limiting the influence of ambient light.
The marker allows researchers to compare circadian phase across conditions that may alter the relationship between internal timing and daily routines. Studies can examine patterns associated with shift work, jet lag, or aging, then evaluate whether sleep timing or schedule alignment differs. It can also help assess changes associated with light-based interventions.
A difference between DLMO timing and a person’s usual schedule may indicate that the internal clock and externally imposed routine are not well aligned. In behavioral studies, this comparison helps clarify sleep-timing challenges and the effects of demanding schedules. The result is a phase-based perspective on behavior that clock time alone cannot provide.