SLEEP 2011 Abstract Supplement

A. Basic Science III. Ontogeny/Aging
Napping (N) and Non-Napping children (NN; per caregiver report at
baseline) lost equal amounts of sleep (~3 hours over the week per actigraphy)
as they transitioned to all-day K where napping was reduced or
eliminated; however NN lost nocturnal sleep and N lost diurnal sleep.
The current analyses focus on endocrine changes (ACR) in the same
cohort. Very little is known about the ACR during childhood. Research
in adults suggests that the ACR is associated with a variety of psychological
and health variables including sleep.
Methods: Data were collected from 34 children (44% female) recruited
from the community. Caregivers collected saliva at 0, 15, and 30 minutes
post wake on one day at each of the following: the summer prior to
K, within two weeks of K, and after one month of K. Accuracy of wake
saliva sampling was confirmed by comparing actigraphically-assessed
wake time with caregiver-reported sampling time. Dynamic (increase)
of the ACR was computed using area under the curve (AUC) increase
and % change. Overall cortisol production post wake was calculated using
AUC ground. Participants were excluded if they did not have complete
sleep or cortisol data (n = 4).
Results: The ACR was evident in this sample of children and had significant
linear η2 = .71 and quadratic η2=.73 trends. On average, cortisol
rose 69.2% fifteen minutes (p