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

10 settembre 2021 aggiornato da: 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.

Panoramica dello studio

Stato

Completato

Condizioni

Intervento / Trattamento

Tipo di studio

Interventistico

Iscrizione (Effettivo)

33

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Stati Uniti
    • Massachusetts
      • Boston, Massachusetts, Stati Uniti, 02115
        • Brigham and Women's Hospital

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

Da 18 anni a 30 anni (Adulto)

Accetta volontari sani

No

Sessi ammissibili allo studio

Tutto

Descrizione

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.

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Scienza basilare
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione fattoriale
  • Mascheramento: Separare

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Comparatore attivo: Compact Fluorescent Light 90 lux
90 lux exposure of a commercially available Compact Fluorescent Light (CFL).
Dispositivo: 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).
Sperimentale: 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).
Dispositivo: 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).
Comparatore attivo: Compact Fluorescent Light 50 lux
50 lux exposure of a commercially available Compact Fluorescent Light (CFL).
Dispositivo: 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).
Sperimentale: 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).
Dispositivo: 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).

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Melatonin Suppression
Lasso di tempo: 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

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Sleep Structure
Lasso di tempo: 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
Lasso di tempo: 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
Lasso di tempo: 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
Lasso di tempo: 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

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Brigham and Women's Hospital

Collaboratori

Biological Illumination LLC

Investigatori

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

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio

1 agosto 2012

Completamento primario (Effettivo)

1 marzo 2014

Completamento dello studio (Effettivo)

1 marzo 2014

Date di iscrizione allo studio

Primo inviato

24 aprile 2012

Primo inviato che soddisfa i criteri di controllo qualità

25 aprile 2012

Primo Inserito (Stima)

26 aprile 2012

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

14 settembre 2021

Ultimo aggiornamento inviato che soddisfa i criteri QC

10 settembre 2021

Ultimo verificato

1 settembre 2021

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Altri numeri di identificazione dello studio

  • 2011-P-002834

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

prodotto fabbricato ed esportato dagli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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