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The long-term effects of the Lekker Fit! intervention on physical fitness, physical activity, BMI-sds, and percent fat mass.

The long-term effects of a primary school-based overweight preventive intervention on physical fitness, physical activity, BMI-sds, and percent fat mass: a propensity score matching analysis among children within the Generation R Study cohort

Status
Completed
Phases
Unknown
Study type
Observational
Source
ANZCTR
Registry ID
ACTRN12624000301561
Enrollment
3765
Registered
2024-03-21
Start date
2002-04-01
Completion date
2006-01-31
Last updated
2024-03-25

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

Conditions

None listed

Brief summary

The Lekker Fit! intervention is a multi-component (physical activity and diet) intervention in primary schools in Rotterdam, the Netherlands. Due to scarce knowledge on long-term effects, this study aims to evaluate its long-term effects on physical fitness and physical activity among children after the transition to secondary schools. The current LF intervention study is embedded within the Generation R Study cohort, a population-based prospective birth cohort study, in which children born between April 2002 and January 2006 are followed over time. Children are being invited for measurements and questionnaires at the research site every 3 or 4 years. Children from the Generation R Study are eligible for the LF intervention study if information is available on their primary school career through successful data transfer from the municipality of Rotterdam. Based on this data we retrospectively consider children as being part of the Lekker Fit! group or the regular school group. Outcome measurements for physical fitness (highest achieved work rate at the Steep Ramp Test) and physical activity (the number of days per week with at least one hour of physical activity) are collected around the age of 13 years old during a research site visit in the Generation R Study. The study is expected to finish in the 2nd half of 2023. Main contact persons for the study are M. Smit & F. Mölenberg & W. Jansen m.s.smit@erasmusmc.nl Department of Public Health, Erasmus Medical Centre, Rotterdam, the Netherlands.

Interventions

The Lekker Fit! (LF) intervention has been developed by the Sports department of the City of Rotterdam, the Netherlands in close collaboration with primary schools. It is a multi-component overweight preventive primary school-based intervention. The intervention targeted children aged 6/7 to 12/13 years old, primarily in socioeconomically disadvantaged neighborhoods. Since its development in 2005, the intervention has been scaled up to almost half of the primary schools in the city. LF focuses

The Lekker Fit! (LF) intervention has been developed by the Sports department of the City of Rotterdam, the Netherlands in close collaboration with primary schools. It is a multi-component overweight preventive primary school-based intervention. The intervention targeted children aged 6/7 to 12/13 years old, primarily in socioeconomically disadvantaged neighborhoods. Since its development in 2005, the intervention has been scaled up to almost half of the primary schools in the city. LF focuses on a healthy diet and healthy lifestyle rather than focusing directly on the reduction of overweight. The intervention targets individual behavior of children as well as their obesogenic environment and parental engagement . LF entails multiple components including but not limited to an additional third physical education lesson per week in comparison with regular school programs, professional physical education teachers instead of regular classroom teachers providing the physical education lessons, additional voluntary physical activity sessions outside school hours in cooperation with local sports clubs, special themed education on healthy lifestyle topics and, since 2013, the promotion of drinking water. The intervention is applied from grade 3-8 (6-to-12 years old) on primary schools, and since 2012 from grade 1-8 (4-to-12 years old). For children in this study, we retrospectively considered them as the Lekker Fit! group if they have received the Lekker Fit! intervention for all primary school years, or as the regular school group, if they have received the intervention for < 6 months during their primary school. The mixed group contained children with an amount of LF exposure in between these groups. This data was received from the municipal records of the municipality of Rotterdam, the Netherlands. The school career data range is from the 23th of September 2003 to 29th of July in 2022 for the complete dataset, but for individual participants it entails the years in which they attended primary school.

Sponsors

Erasmus Medical Centre
Lead SponsorHospital

Eligibility

Sex/Gender
All
Healthy volunteers
Yes

Inclusion criteria

- Being a child in the Generation R Study cohort in Rotterdam, the Netherlands - Parental consent given for the transfer of school career data from the municipality of Rotterdam - Successful coupling to school career data from the municipality of Rotterdam - Data collected at the research site visit (13 years old) within the Generation R Study for at least one of the primary outcomes in the study

Exclusion criteria

- No parental consent given for the transfer of school career data from the municipality of Rotterdam - No school career data available for retrospective intervention assignment - No data collected, or no valid data available, on both of the primary outcomes in this study

Outcome results

None listed

Source: ANZCTR · Data processed: Feb 4, 2026