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BMC Neurology
Published in: BMC Neurology 1/2021

01-12-2021 | Insomnia | Research article

Home-based light therapy for fatigue following acquired brain injury: a pilot randomized controlled trial

Authors: Laura J. Connolly, Shantha M. W. Rajaratnam, Jade M. Murray, Gershon Spitz, Steven W. Lockley, Jennie L. Ponsford

Published in: BMC Neurology | Issue 1/2021

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Abstract

Background and objectives

Fatigue and sleep disturbance are debilitating problems following brain injury and there are no established treatments. Building on demonstrated efficacy of blue light delivered via a lightbox in reducing fatigue and daytime sleepiness after TBI, this study evaluated the efficacy of a novel in-home light intervention in alleviating fatigue, sleep disturbance, daytime sleepiness and depressive symptoms, and in improving psychomotor vigilance and participation in daily productive activity, following injury

Methods

The impact of exposure to a dynamic light intervention (Treatment) was compared to usual lighting (Control) in a randomized within-subject, crossover trial. Outcomes were fatigue (primary outcome), daytime sleepiness, sleep disturbance, insomnia symptoms, psychomotor vigilance, mood and activity levels. Participants (N = 24, M ± SDage = 44.3 ± 11.4) had mild-severe TBI or stroke > 3 months previously, and self-reported fatigue (Fatigue Severity Scale ≥ 4). Following 2-week baseline, participants completed each condition for 2 months in counter-balanced order, with 1-month follow-up. Treatment comprised daytime blue-enriched white light (CCT > 5000 K) and blue-depleted light (< 3000 K) 3 h prior to sleep.

Results

Random-effects mixed-model analysis showed no significantly greater change in fatigue on the Brief Fatigue Inventory during Treatment, but a medium effect size of improvement (p = .33, d = -0.42). There were significantly greater decreases in sleep disturbance (p = .004), insomnia symptoms (p = .036), reaction time (p = .004) and improvements in productive activity (p = .005) at end of Treatment relative to Control, with large effect sizes (d > 0.80). Changes in other outcomes were non-significant.

Conclusions

This pilot study provides preliminary support for in-home dynamic light therapy to address sleep-related symptoms in acquired brain injury.

Trial registration

This trial was registered with the Australian and New Zealand Clinical Trials Registry on 13 June 2017, www.​anzctr.​org.​au, ACTRN12617000866303.
Appendix
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Metadata
Title
Home-based light therapy for fatigue following acquired brain injury: a pilot randomized controlled trial
Authors
Laura J. Connolly
Shantha M. W. Rajaratnam
Jade M. Murray
Gershon Spitz
Steven W. Lockley
Jennie L. Ponsford
Publication date
01-12-2021
Publisher
BioMed Central
Published in
BMC Neurology / Issue 1/2021
Electronic ISSN: 1471-2377
DOI
https://doi.org/10.1186/s12883-021-02292-8

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