Phototherapy for patients with Alzheimer disease with disturbed sleep patterns: Results of a community-based pilot study

Christopher C. Colenda, Wayne Cohen, William Vaughn McCall, Peter B. Rosenquist

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

We examined the entraining effects of phototherapy delivered by light visors on disturbed sleep patterns of community-dwelling research subjects with Alzheimer disease (AD). The pilot project used a single subject design and activity monitoring as the primary outcome measures. The protocol consisted of a 5-day baseline monitoring period, followed by 10 consecutive days of phototherapy (2000 lux of full spectrum bright light) delivered by light visors for 2 hours each morning; this was followed by an additional 14 days of activity monitoring. Cosinor analyses found no consistent changes in acrophase, mesor, or amplitude. Observed changes in acrophase were consistent with phase advancement of the rest-activity cycle and consistent with the biological intervention. Changes in the number of nighttime awakenings were not found. One subject had a significant increase in total sleep time, whereas another had a significant decrease in total sleep time. Failure to find a consistent biological effect of light on AD subjects may be secondary to: (1) insufficient duration of light exposure; (2) timing of light administration (given at a time when circadian rhythm is refractory to the effects of light); (3) advanced stages of AD making the Y circadian pacemaker in the suprachiasmatic nucleus of the hypothalamus insensitive to the biological effects of light; and (4) inadequacy of light visors as a means of providing light.

Original languageEnglish (US)
Pages (from-to)175-178
Number of pages4
JournalAlzheimer Disease and Associated Disorders
Volume11
Issue number3
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

Fingerprint

Phototherapy
Alzheimer Disease
Sleep
Light
Research Subjects
Activity Cycles
Independent Living
Suprachiasmatic Nucleus
Circadian Rhythm
Hypothalamus
Outcome Assessment (Health Care)

Keywords

  • Alzheimer disease
  • Circadian rhythm
  • Phototherapy
  • Sleep disturbances

ASJC Scopus subject areas

  • Clinical Psychology
  • Gerontology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

Cite this

@article{b4a245024d1c4456af1a0ed90ef252c3,
title = "Phototherapy for patients with Alzheimer disease with disturbed sleep patterns: Results of a community-based pilot study",
abstract = "We examined the entraining effects of phototherapy delivered by light visors on disturbed sleep patterns of community-dwelling research subjects with Alzheimer disease (AD). The pilot project used a single subject design and activity monitoring as the primary outcome measures. The protocol consisted of a 5-day baseline monitoring period, followed by 10 consecutive days of phototherapy (2000 lux of full spectrum bright light) delivered by light visors for 2 hours each morning; this was followed by an additional 14 days of activity monitoring. Cosinor analyses found no consistent changes in acrophase, mesor, or amplitude. Observed changes in acrophase were consistent with phase advancement of the rest-activity cycle and consistent with the biological intervention. Changes in the number of nighttime awakenings were not found. One subject had a significant increase in total sleep time, whereas another had a significant decrease in total sleep time. Failure to find a consistent biological effect of light on AD subjects may be secondary to: (1) insufficient duration of light exposure; (2) timing of light administration (given at a time when circadian rhythm is refractory to the effects of light); (3) advanced stages of AD making the Y circadian pacemaker in the suprachiasmatic nucleus of the hypothalamus insensitive to the biological effects of light; and (4) inadequacy of light visors as a means of providing light.",
keywords = "Alzheimer disease, Circadian rhythm, Phototherapy, Sleep disturbances",
author = "Colenda, {Christopher C.} and Wayne Cohen and McCall, {William Vaughn} and Rosenquist, {Peter B.}",
year = "1997",
month = "1",
day = "1",
doi = "10.1097/00002093-199709000-00011",
language = "English (US)",
volume = "11",
pages = "175--178",
journal = "Alzheimer Disease and Associated Disorders",
issn = "0893-0341",
publisher = "Lippincott Williams and Wilkins",
number = "3",

}

TY - JOUR

T1 - Phototherapy for patients with Alzheimer disease with disturbed sleep patterns

T2 - Results of a community-based pilot study

AU - Colenda, Christopher C.

AU - Cohen, Wayne

AU - McCall, William Vaughn

AU - Rosenquist, Peter B.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - We examined the entraining effects of phototherapy delivered by light visors on disturbed sleep patterns of community-dwelling research subjects with Alzheimer disease (AD). The pilot project used a single subject design and activity monitoring as the primary outcome measures. The protocol consisted of a 5-day baseline monitoring period, followed by 10 consecutive days of phototherapy (2000 lux of full spectrum bright light) delivered by light visors for 2 hours each morning; this was followed by an additional 14 days of activity monitoring. Cosinor analyses found no consistent changes in acrophase, mesor, or amplitude. Observed changes in acrophase were consistent with phase advancement of the rest-activity cycle and consistent with the biological intervention. Changes in the number of nighttime awakenings were not found. One subject had a significant increase in total sleep time, whereas another had a significant decrease in total sleep time. Failure to find a consistent biological effect of light on AD subjects may be secondary to: (1) insufficient duration of light exposure; (2) timing of light administration (given at a time when circadian rhythm is refractory to the effects of light); (3) advanced stages of AD making the Y circadian pacemaker in the suprachiasmatic nucleus of the hypothalamus insensitive to the biological effects of light; and (4) inadequacy of light visors as a means of providing light.

AB - We examined the entraining effects of phototherapy delivered by light visors on disturbed sleep patterns of community-dwelling research subjects with Alzheimer disease (AD). The pilot project used a single subject design and activity monitoring as the primary outcome measures. The protocol consisted of a 5-day baseline monitoring period, followed by 10 consecutive days of phototherapy (2000 lux of full spectrum bright light) delivered by light visors for 2 hours each morning; this was followed by an additional 14 days of activity monitoring. Cosinor analyses found no consistent changes in acrophase, mesor, or amplitude. Observed changes in acrophase were consistent with phase advancement of the rest-activity cycle and consistent with the biological intervention. Changes in the number of nighttime awakenings were not found. One subject had a significant increase in total sleep time, whereas another had a significant decrease in total sleep time. Failure to find a consistent biological effect of light on AD subjects may be secondary to: (1) insufficient duration of light exposure; (2) timing of light administration (given at a time when circadian rhythm is refractory to the effects of light); (3) advanced stages of AD making the Y circadian pacemaker in the suprachiasmatic nucleus of the hypothalamus insensitive to the biological effects of light; and (4) inadequacy of light visors as a means of providing light.

KW - Alzheimer disease

KW - Circadian rhythm

KW - Phototherapy

KW - Sleep disturbances

UR - http://www.scopus.com/inward/record.url?scp=0030984045&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030984045&partnerID=8YFLogxK

U2 - 10.1097/00002093-199709000-00011

DO - 10.1097/00002093-199709000-00011

M3 - Article

C2 - 9305504

AN - SCOPUS:0030984045

VL - 11

SP - 175

EP - 178

JO - Alzheimer Disease and Associated Disorders

JF - Alzheimer Disease and Associated Disorders

SN - 0893-0341

IS - 3

ER -