Summertime: Kids in Motion

Not Applicable

Terminated

Conditions: Sleep

Interventions: Behavioral: Short sleep
Behavioral: Long sleep

Registration Number: NCT03947918

Lead Sponsor: University of California, San Francisco

Brief Summary: This is a 3-week randomized crossover study to determine the effect of the prior night's sleep duration on energy-balance related behaviors of diet and physical activity the following day. In Week 1, child participants will sleep their usual amount. In week 2, participants will be randomized to either a sleep restricted or a healthy sleep condition for 4 nights. In week 3, participants will cross over to the opposite sleep condition for 4 nights.

Detailed Description: Individuals of Mexican descent comprise the largest proportion of the Latino population in the United States and they suffer high rates of obesity. Short sleep is a risk factor for obesity. An improved understanding of the underlying behavioral mechanisms by which short sleep duration may impact obesity among Mexican American children is critical to prevent and/or reduce obesity and chronic disease in this population. This research will focus on behavioral mechanisms (i.e., diet and physical activity) that link sleep duration to obesity. Mexican American 8-10-year-olds will participate in a 3-week crossover study to examine: 1) contextual factors (i.e., bedtime routines, sleep hygiene, familism) that may impact sleep; and 2) the impact of prior night's sleep duration on diet and physical activity the subsequent day. This research design will make it possible to examine whether sufficient sleep is protective of energy balance (e.g., healthful dietary intake/patterns and physical activity) as well as contextual factors related sleep.

Recruitment & Eligibility

Status: TERMINATED

Sex: All

Target Recruitment: 34

Inclusion Criteria

Mexican American child-mother pairs which will include: child 8-10 years old; mother/female guardian; English/Spanish speakers; mobile phone user.

Exclusion Criteria

Children with major illnesses and/or with sleep apnea for which children
In families where 2 children are eligible for participation, a child will be selected at random to participate in the study.
The investigators will exclude fathers from this study for reasons due to statistical power

Study & Design

Study Type: INTERVENTIONAL

Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Short sleep	Long sleep	No more than 8 hours of sleep for 4 consecutive nights.
Short sleep	Short sleep	No more than 8 hours of sleep for 4 consecutive nights.
Long sleep	Short sleep	At least 10 hours of sleep for 4 consecutive nights
Long sleep	Long sleep	At least 10 hours of sleep for 4 consecutive nights

Primary Outcome Measures

Name	Time	Method
Differences in Sleep Duration by Sleep Condition.	One week	Sleep duration will be measured with accelerometers.
Differences in Added Sugar Intake by Long and Short Sleep Condition.	One week	Sleep duration will be measured with accelerometers. Eating/dietary intake (outcome) will be assessed on Thursdays and Fridays using 24-hour recalls using Nutrition Data System for Research. Sleep duration will be measured with accelerometers. Dietary intake (outcome) will be assessed on Thursdays and Fridays using 24-hour recalls using Nutrition Data System for Research. Daily sugar intake (grams) will be calculated.
Differences in Physical Activity (Outcome) by Short and Long Sleep Condition.	One week	Physical activity will be measured with accelerometers. Accelerometer data will be used to calculate moderate- to vigorous-intensity physical activity (MVPA; minutes). Activity counts were summed for each 24-hour period categorized into moderate to vigorous levels of physical activity according to the previously established thresholds. Moderate physical activity was set at 0.04 \< AEE \< 0.10 kcal.kg-1.min-1 or 3.0 \< PAR \< 6.0, reflective of medium exertion in the standing position. Vigorous physical activity was set at AEE \> 0.10 kcal.kg-1.min-1 or PAR \> 6.0, reflective of activities at a high level of exertion in the standing position. Moderate-intensity and vigorous-intensity physical activity were combined and expressed as minutes spent in MVPA.
Differences in Carbohydrate Intake by Long and Short Sleep Condition.	One week	Sleep duration will be measured with accelerometers. Eating/dietary intake (outcome) will be assessed on Thursdays and Fridays using 24-hour recalls using Nutrition Data System for Research. Sleep duration will be measured with accelerometers. Dietary intake (outcome) will be assessed on Thursdays and Fridays using 24-hour recalls using Nutrition Data System for Research. Daily sugar intake (grams) will be calculated.

Secondary Outcome Measures

Name	Time	Method
Maternal Sleep Duration	Baseline measurement (one time point)	Mothers' bedtimes and wakeup times will be assessed by self report.
Sleep Hygiene Related to Children's Sleep Schedules.	Baseline measurement (one time point)	Sleep hygiene will be assessed by whether the child shares a bed, shares a room and a bed, shares a room (but not a bed), or does not any. Child sleep schedule (bedtime) will be measured by parent report.