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Investigating the Effects of Evening Light Exposure on Melatonin Suppression, Alertness and Nocturnal Sleep

10. september 2021 opdateret af: Steven W. Lockley, Brigham and Women's Hospital

Investigating the Effects of Evening Light Exposure on Melatonin Suppression, Alertness and Nocturnal Sleep.

The timing and quality of sleep is governed by environmental and physiologic factors. Environmental factors, especially ambient lighting can impact the circadian system and alter the timing and structure of sleep. Light exposure can also acutely alter neural activation state and impair sleep. These effects all demonstrate marked sensitivity to short-wavelength blue light with maximal sensitivity in the 460-480 nm range. The alerting effects of blue light in the evening persist for at least 3-4 hours after the lights are turned off, and can disturb subsequent sleep. Avoiding these deleterious effects of light exposure prior to sleep on subsequent sleep would be beneficial to sleep quality and potentially health.

The investigators will compare the effects of two light sources, equated for visual stimulus (lux), on multiple non-visual responses to light. The investigators will compare a 90 lux exposure of a commercially available Compact Fluorescent Light (CFL) with a novel LED white light source that is depleted in the short-wavelength visible range (Biological Illumination LCC, FL). In a within-subject design, the investigators will test the hypotheses that exposure to a blue-depleted LED as compared to a CFL exposure at (1) 90 lux or (2) 50 lux will cause significantly:

  1. Less melatonin suppression between melatonin onset and bedtime;
  2. Less subjective and objective alerting responses before bedtime;
  3. Less disruption of nocturnal sleep structure and quality.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

33

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Forenede Stater
    • Massachusetts
      • Boston, Massachusetts, Forenede Stater, 02115
        • Brigham and Women's Hospital

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 30 år (Voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

(i) Aged between 18-30 years to reduce the confounding effects of lens aging on the transmission of light to the retina;

(ii) Non-smoking for at least 6 months;

(iii) Healthy (no medical, psychiatric or sleep disorders);

(iv) No clinically significant deviations from normal in medical history, vital signs, physical examination, blood chemistry and hematology, urine chemistry and ECG;

(v) Women of childbearing potential must agree to use an acceptable method of birth control, and must have a negative urine pregnancy test;

(vi) Body mass index of > 18 or < 30 kg/m2;

(vii) No drugs or medication likely to affect sleep or alertness, as determined by the investigators;

(viii) Habitual caffeine consumption < 300mg per day on average;

(ix) Habitual alcohol consumption < 10 alcoholic units per week on average.

Exclusion Criteria:

(i) History of alcohol or substance abuse;

(ii) Positive result on drugs of abuse screening;

(iii) Current or past history of sleep disorders, including but not limited to obstructive sleep apnea, or any significant sleep complaint;

(iv) Psychiatric disorder;

(v) Recent acute or chronic medical disorder, including but not limited to hepatic impairment and severe chronic obstructive pulmonary disease;

(vi) Visual disorder, including but not limited to color blindness, or family history of glaucoma;

(vii) History of intolerance or hypersensitivity to melatonin or melatonin agonists;

(viii) Pregnancy or lactation;

(ix) Shift work;

(x) Transmeridian travel (2 or more time zones) in past 2 months;

(xi) Any other reason as determined by the Principal Investigator.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Grundvidenskab
  • Tildeling: Randomiseret
  • Interventionel model: Faktoriel opgave
  • Maskning: Enkelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Aktiv komparator: Compact Fluorescent Light 90 lux
90 lux exposure of a commercially available Compact Fluorescent Light (CFL).
Enhed: Visible light
We will compare the effects of two light sources, equated for visual stimulus (lux), on multiple non-visual responses to light including melatonin suppression before bedtime. We will compare a 90 lux exposure of a commercially available Compact Fluorescent Light (CFL) with a novel LED white light source that is depleted in the short-wavelength visible range (Biological Illumination LCC, FL).
Eksperimentel: Blue-depleted LED light 90 lux
90 lux exposure of a novel LED white light source that is depleted in the short-wavelength visible range (Biological Illumination LCC, FL).
Enhed: Visible light
We will compare the effects of two light sources, equated for visual stimulus (lux), on multiple non-visual responses to light including melatonin suppression before bedtime. We will compare a 90 lux exposure of a commercially available Compact Fluorescent Light (CFL) with a novel LED white light source that is depleted in the short-wavelength visible range (Biological Illumination LCC, FL).
Aktiv komparator: Compact Fluorescent Light 50 lux
50 lux exposure of a commercially available Compact Fluorescent Light (CFL).
Enhed: Visible light
We will compare the effects of two light sources, equated for visual stimulus (lux), on multiple non-visual responses to light including melatonin suppression before bedtime. We will compare a 90 lux exposure of a commercially available Compact Fluorescent Light (CFL) with a novel LED white light source that is depleted in the short-wavelength visible range (Biological Illumination LCC, FL).
Eksperimentel: Blue-depleted LED light 50 lux
50 lux exposure of a novel LED white light source that is depleted in the short-wavelength visible range (Biological Illumination LCC, FL).
Enhed: Visible light
We will compare the effects of two light sources, equated for visual stimulus (lux), on multiple non-visual responses to light including melatonin suppression before bedtime. We will compare a 90 lux exposure of a commercially available Compact Fluorescent Light (CFL) with a novel LED white light source that is depleted in the short-wavelength visible range (Biological Illumination LCC, FL).

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Melatonin Suppression
Tidsramme: 6-h constant posture interval of the light exposure
Melatonin suppression is measured as the percentage of melatonin AUC relative to the AUC measured in dim light on the previous day. AUC was calculated during the 6 h of light exposure and the corresponding 6-h interval 24 hours earlier. Higher values indicate more light-induced melatonin suppression.
6-h constant posture interval of the light exposure

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Sleep Structure
Tidsramme: 8-h time in bed immediately following CFL/LED light exposure.
Sleep efficiency assessed by polysomnography. Sleep efficiency refers to the percentage of time a person sleeps, in relation to the amount of time a person spends in bed trying to sleep. The percentage is calculated by dividing the Total Sleep Time by the Total Time in Bed.
8-h time in bed immediately following CFL/LED light exposure.
Sleep Quality
Tidsramme: First morning after 8-h time in bed immediately following CFL/LED light exposure.
Self-reported sleep quality was assessed using a post sleep questionnaire. Score on subjective scale range 1-7, higher scores indicate higher sleep quality.
First morning after 8-h time in bed immediately following CFL/LED light exposure.
Subjective Alerting Response
Tidsramme: 6-h constant posture interval of the light exposure.
Self-reported sleepiness measured during the light exposure using the Karolinska Sleepiness Scale (KSS). Range of scores 1-9, higher score indicate higher subjective sleepiness. Measures were taken hourly throughout the 6-hour constant posture interval of the light exposure and then averaged to calculate a single value per participant.
6-h constant posture interval of the light exposure.
Objective Alerting Response
Tidsramme: 6-h constant posture interval of the light exposure
Mean reaction time assessed using the 10-minute psychomotor vigilance test. Higher numbers indicate slower reaction times indicating less alertness. Measures were taken hourly throughout the 6-hour constant posture interval of the light exposure and then averaged to calculate a single value per participant.
6-h constant posture interval of the light exposure

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Brigham and Women's Hospital

Samarbejdspartnere

Biological Illumination LLC

Efterforskere

  • Ledende efterforsker: Steven W Lockley, Ph.D., Brigham and Women's Hospital; Harvard Medical School

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. august 2012

Primær færdiggørelse (Faktiske)

1. marts 2014

Studieafslutning (Faktiske)

1. marts 2014

Datoer for studieregistrering

Først indsendt

24. april 2012

Først indsendt, der opfyldte QC-kriterier

25. april 2012

Først opslået (Skøn)

26. april 2012

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

14. september 2021

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

10. september 2021

Sidst verificeret

1. september 2021

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Andre undersøgelses-id-numre

  • 2011-P-002834

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Kliniske forsøg med Visible light

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