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Sleep. 2018 Oct 1;41(10). doi: 10.1093/sleep/zsy127.

Lifetime coffee consumption, pineal gland volume, and sleep quality in late life.

Author information

1
Department of Brain and Cognitive Science, Seoul National University College of Natural Sciences, Seoul, South Korea.
2
Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, South Korea.
3
Department of Biomedical Science and Engineering and School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, South Korea.
4
Department of Psychiatry, Seoul National University College of Medicine, Seoul, South Korea.

Abstract

Study Objectives:

Previous studies have shown that coffee consumption may suppress the production of melatonin in pinealocytes through competitive inhibition of adenosine A2 receptors by caffeine. We investigated the impact of lifetime coffee consumption on pineal gland volume and the resulting effects on sleep quality.

Methods:

We enrolled 162 cognitively normal elderly individuals among the participants in the Korean Longitudinal Study on Cognitive Aging and Dementia. We evaluated the patterns and amounts of coffee consumption using a study-specific standardized interview and assessed sleep quality using the Pittsburgh Sleep Quality Index. We measured the volume of pineal parenchyma (VPP) by manually segmenting the pineal gland on high-resolution three-dimensional T1-weighted magnetic resonance images. We examined the impact of lifetime coffee consumption on the VPP and the resulting effects on sleep quality using analysis of covariance, multiple linear regression, and mediation analyses.

Results:

We found that smaller VPP was associated with higher cumulative lifetime coffee consumption. Participants who consumed more than 60 cup-years of coffee had VPPs that were smaller by about 20% than individuals who consumed less than 60 cup-years of coffee. The VPP mediated the association between lifetime coffee consumption and sleep efficiency and quality.

Conclusions:

Our findings suggest that high lifetime coffee consumption may reduce VPP, and that this reduction in VPP may impair the quality of sleep in late life.

PMID:
30011049
DOI:
10.1093/sleep/zsy127

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