The mediating role of cortical thickness and gray matter volume on sleep slow-wave activity during adolescence
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During the course of adolescence, reductions occur in cortical thickness and gray matter (GM) volume, along with a 65% reduction in slow-wave (delta) activity during sleep (SWA) but empirical data linking these structural brain and functional sleep differences, is lacking. Here, we investigated specifically whether age-related differences in cortical thickness and GM volume and cortical thickness accounted for the typical age-related difference in slow-wave (delta) activity (SWA) during sleep. 132 healthy participants (age 12–21 years) from the National Consortium on Alcohol and NeuroDevelopment in Adolescence study were included in this cross-sectional analysis of baseline polysomnographic, electroencephalographic, and magnetic resonance imaging data. By applying mediation models, we identified a large, direct effect of age on SWA in adolescents, which explained 45% of the variance in ultra-SWA (0.3–1 Hz) and 52% of the variance in delta-SWA (1 to <4 Hz), where SWA was lower in older adolescents, as has been reported previously. In addition, we provide evidence that the structure of several, predominantly frontal, and parietal brain regions, partially mediated this direct age effect, models including measures of brain structure explained an additional 3–9% of the variance in ultra-SWA and 4–5% of the variance in delta-SWA, with no differences between sexes. Replacing age with pubertal status in models produced similar results. As reductions in GM volume and cortical thickness likely indicate synaptic pruning and myelination, these results suggest that diminished SWA in older, more mature adolescents may largely be driven by such processes within a number of frontal and parietal brain regions.
KeywordsSlow-wave activity Adolescence Cortical development Sleep
The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. We thank our lab manager, Stephanie Claudatos, and research assistants, David Dresser, David Sugarbaker, Justin Greco, Sarah Inkelis, Lena Kardos, Devika Nair, and Leonardo Rosas, for their effort in collecting data for this project, and all research participants.
Compliance with ethical standards
Conflict of interest
FCB and MdZ have received research grants from Fitbit Inc., Ebb Inc., and International Flavors and Fragrances Inc.
This study was supported by the National Consortium on Alcohol and NeuroDevelopment in Adolescence (NCANDA); grants: AA021690 (DBC), AA021697 (AP + KMP), AA021697-04S1 (KMP), AA021696 (IMC + FCB) and AA021695 (NCANDA Admin).
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