DOI: 10.3886/e212602v1
title: Caloric Intake in Adolescents using a Forced Desynchrony Design

description: This project contains the analytic dataset, R syntax, and meta data for a publication focused on understanding the independent roles of the endogenous circadian system and of
the behavioral sleep/wake cycle (sleep/wake, eating/fasting, rest/activity, dark/dim
light, social interaction, posture, etc.) on self-selected caloric intake using
a forced desynchrony protocol. Data is from Fifty-one male and female adolescents across three
BMI%ile categories (24 with healthy weight, BMI%ile &lt;85%; 13 with
overweight, 85%≤BMI%ile &lt;95%; and 14 with obesity BMI%ile ≥95%) who lived on seven 28-h sleep/wake cycles in dim
light during wake and complete darkness during sleep. <br>
description: N/A
description: Response Rates: 51 participants completed the forced desynchrony protocol
description: Presence of Common Scales: Caloric Intake: Quantity (grams) and macronutrient content of each food item was calculated using he Nutrition Data System for Research (NDSR), the USDA
National Nutrient Database for Standard Reference, and the product label. <br>Circadian Phase: Dim light melatonin
onset (DLMO) and endogenous circadian phase was calculated using salivary samples collected at 20-45-minute intervals.<br>Sleep:Continuous
polysomnographic recordings during all sleep episodes were made using
Compumedics Grael recording systems (Charlotte, NC),
digitized and stored with a sampling rate of 400 samples per second.
<br>Pubertal development. Self-reported pubertal stage was assessed using the Pubertal Development Scale. Responses on the questionnaire were scored to
convert to a 1-5 scale score, with 1 indicating that the individual is
pre-pubertal and 5 indicating that the individual is post pubertal. Participants were classified into two groups
defined as “early puberty” (stages 1,2,3) and “late puberty” (stages
4,5). <br>Estimated Energy Requirement for each participant for the
28-hour sleep/wake cycle during the FD was calculated based on age, gender,
height, and weight according to formulas published by the Institute of Medicine and proportionally scaled up to meet the longer
28-h sleep/wake cycle and using a physical activity coefficient of 1.0, as the
activity level for participants was low while in the laboratory setting. Morningness/eveningness
preference: As part of the final screening process, participants completed
the 13-item morningness scale of Smith et al., which provides a continuous score ranging from
13 to 55, with lower scores indicating a greater evening preference. <br>

Pre-meal hunger. Participants
completed a visual analog assessment of hunger just prior to each meal was
included in analyses (2 min prior to meal 1 of the day; 27 min prior to meals 2
through 6). <br>

Post-meal
scales. A
3-item scale was administered at the completion of each meal. On a 9-point
Likert scale, participants were asked the following questions: “Now that you
have finished your meal, please circle a number to rate how tasty, yummy,
delicious it was to you” with ratings ranging from 1= “not at all delicious” to
9= “extremely delicious”; “Now that you have finished your meal, please circle
a number to rate how satisfied you feel by what you ate” with ratings ranging
from 1= “not at all satisfied” to 9= “extremely satisfied”; and “Now that you
have finished your meal, please circle a number to rate how full you feel by
what you ate” with ratings ranging from 1= “not at all full” to 9= “extremely”
full.
description: Participants were recruited through advertising and community engagement
description: Smallest Geographic Unit: N/A
description: on-site questionnaire; other;