Healthy preschool children
Conditions
Interventions
Intervention group: 4 weeks. At home, participants consume 1 piece of processed cheese (approx 17 g) once daily at breakfast (within 2 hours after waking). In addition, the nursery/kindergarten extend
when outdoor activity is not feasible, activities are conducted indoors in a bright environment.
Control group: 4 weeks. Usual lifestyle without additional food intervention or extended morning outdoo
Sponsors
Hiroshima University
Megmilk Snow Brand Co., Ltd
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: 1. Children aged 3-6 years at study start 2. Enrolled in a nursery school, kindergarten, or certified child center in Fuchu Town, Aki-gun, Hiroshima, and attending at least 4 days per week 3. Written informed consent obtained from a parent or legal guardian 4. No food allergy to dairy products (milk, cheese, yogurt, etc) 5. Expected to continue attending the same institution during the study period
Exclusion criteria
Exclusion criteria: 1. Diagnosed sleep disorder currently under treatment 2. Severe chronic disease requiring dietary restriction 3. Diagnosed lactose intolerance or history of gastrointestinal symptoms after dairy intake 4. Marked difficulty in wearing the actigraph or completing study procedures (including parent judgement) 5. Planned continuous absence from the institution for 1 week or longer during the study period 6. Other reasons judged inappropriate by the investigators
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Nocturnal sleep duration at week 4 assessed by actigraphy MTN-221 using the mean of three consecutive weekdays excluding days adjacent to weekends | — |
Secondary
| Measure | Time frame |
|---|---|
| 1 Nocturnal sleep duration at week 5 assessed by actigraphy 2 Light exposure metrics assessed by light sensor including morning and afternoon illuminance and time above 1000 lx 3 Urinary aMT6s and creatinine adjusted aMT6s Cr 4 Parent reported outcomes including PedsQL SDQ and parenting stress questionnaires 5 Sleep architecture indices (sleep efficiency, sleep onset latency, number and duration of nocturnal awakenings) measured by actigraphy MTN-221 6 Sleep rhythm indices (mean weekday bedtime and wake time, day-to-day variability of bedtime) 7 Total 24-hour sleep duration including daytime naps measured by actigraphy 8 Physical activity (energy expenditure adjusted by basal metabolic rate) measured by actigraphy 9 Media device exposure time assessed by time-use record | — |
Countries
Japan
Contacts
Public ContactNorihisa Tamura
Hiroshima University Graduate School of Humanities and Social Sciences
Outcome results
None listed