Effects of school-based intervention to promote short-time exercise on bone density, physical activity, and psychosocial factors of school children: a cluster randomized controlled trial

Effects of school-based intervention to promote short-time exercise on bone density, physical activity, and psychosocial factors of school children: a cluster randomized controlled trial - Effects of school-based intervention to promote short-time exercise on bone density, physical activity, and psychosocial factors of school children: a cluster randomized controlled trial

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000034992

Enrollment

280

Registered

2018-11-26

Start date

2018-12-06

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

physical inactivity, osteoporosis

Interventions

Intervention group: Wearing a wristband type activity tracker 4 times a year School-based intervention to encourage short-time (about 10 second at one time) physical activity (playing) for 6 months.

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Fourth- and fifth grade children belonging to elementary school in the area Children without restriction of physical activity

Exclusion criteria

Exclusion criteria: Children who have depression symptom

Design outcomes

Primary

Measure	Time frame
Change in physical activity level from baseline to 1-year follw-up (6-month post-intervention follw-up) Changes in quantitative ultrasound parameters (Stiffness index, SOS (speed of sound),BUA (broadband ultrasound attenuation) in post-intervention	—

Secondary

Measure	Time frame
Change in physical activity level in post-intervention Changes in steps, sedentary behavior, proportion of engage in the recommended hour of physical activity per day, and psycho-social variables (e.g. non-cognitive skills, mental health) in post- and 6-month post-intervention Changes in the above variables in motivational readiness in exercise behavior	—

Countries

Japan

Contacts

Public ContactYuka Akiyama

University of Yamanashi Department of Health sciences, Faculty of Medicine

yukaa@yamanashi.ac.jp055-273-9566

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026