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Effects on subjective and objective alertness and sleep in response to evening light exposure in older subjects.

Abstract：

:Evening bright light exposure is reported to ameliorate daytime sleepiness and age-related sleep complaints, and also delays the timing of circadian rhythms. We tested whether evening light exposure given to older adults with sleep-wake complaints would delay the timing of their circadian rhythms with respect to their sleep timing, thereby reducing evening sleepiness and improving subsequent sleep quality. We examined the impact of evening light exposure from two different light sources on subjective alertness, EEG activity during wakefulness, and sleep stages. Ten healthy older adults with sleep complaints (mean age=63.3 years; 6F) participated in a 13-day study. After three baseline days, circadian phase was assessed. On the evening of days 5-8 the subjects were exposed for 2h to either polychromatic blue-enriched white light or standard white fluorescent light, and on the following day circadian phase was re-assessed. Subjects were allowed to leave the laboratory during all but the two days when the circadian phase assessment took place. Evening assessments of subjective alertness, and wake and sleep EEG data were analyzed. Subjective alertness and wake EEG activity in the alpha range (9.75-11.25 Hz) were significantly higher during light exposures when compared to the pre-light exposure evening (p<0.05). The light exposures produced circadian phase shifts and significantly prolonged latency to rapid eye-movement (REM) sleep for both light groups (p<0.05). The increase in wake EEG alpha activity during the light exposures was negatively correlated with REM sleep duration (p<0.05). Evening light exposure could benefit older adults with early evening sleepiness, without negatively impacting the subsequent sleep episode.

journal_name

Behav Brain Res

journal_title

Behavioural brain research

authors

Münch M,Scheuermaier KD,Zhang R,Dunne SP,Guzik AM,Silva EJ,Ronda JM,Duffy JF

doi

10.1016/j.bbr.2011.05.029

subject

Has Abstract

pub_date

2011-10-31 00:00:00

pages

272-8

issue

2

eissn

0166-4328

issn

1872-7549

pii

S0166-4328(11)00434-7

journal_volume

224

pub_type

杂志文章

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