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Manuscript Individual Cosinor.R text/x-rsrc 23.4 KB 12/12/2024 12:16:PM
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manuscript syntax 241205.R text/x-rsrc 90.4 KB 12/12/2024 12:21:PM

Project Citation: 

Carskadon, Mary, and Barker, David . Caloric Intake in Adolescents using a Forced Desynchrony Design. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2024-12-19. https://doi.org/10.3886/E212602V1

Project Description

Summary:  View help for Summary 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 <85%; 13 with overweight, 85%≤BMI%ile <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. 
Funding Sources:  View help for Funding Sources NIDDK (R01 DK101046); NHLBI (R01HL153969); NIGMS (P20GM139743)

Scope of Project

Subject Terms:  View help for Subject Terms adolescents; weight status; Forced Desynchrony ; Caloric Intake; circadian
Geographic Coverage:  View help for Geographic Coverage Rhode Island
Time Period(s):  View help for Time Period(s) 1/2014 – 12/2018
Data Type(s):  View help for Data Type(s) experimental data; observational data; survey data

Methodology

Response Rate:  View help for Response Rate 51 participants completed the forced desynchrony protocol
Sampling:  View help for Sampling Participants were recruited through advertising and community engagement
Collection Mode(s):  View help for Collection Mode(s) on-site questionnaire; other
Scales:  View help for 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.
Circadian Phase: Dim light melatonin onset (DLMO) and endogenous circadian phase was calculated using salivary samples collected at 20-45-minute intervals.
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.
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).
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.
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).
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. 
Weights:  View help for Weights N/A
Unit(s) of Observation:  View help for Unit(s) of Observation multiple daily assessments nested within individuals
Geographic Unit:  View help for Geographic Unit N/A

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