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The Impact of an Intervention Taught by Trained Teachers on Childhood BMI z Score

This study has been completed.
Universidade do Porto
Information provided by:
University of Minho Identifier:
First received: June 28, 2011
Last updated: July 18, 2011
Last verified: July 2011

The purpose of this study is to assess the effects of a six months nutrition intervention, delivered and taught by classroom teachers with in-service nutrition training, on the prevention of overweight and obesity among children in grades 1 to 4.

In this randomized controlled trial, 464 children from seven elementary schools were allocated to a six months nutrition educational intervention by their own teachers or to standard care. Intervened teachers had 12 sessions of three hours each with the researchers throughout six months, according to the following topics: nutrition and healthy eating (sessions 1 to 4); the importance of drinking water (session 5); strategies to encourage fruits and vegetables consumption and to decrease high energy-density foods intake (sessions 6 to 8); strategies to increase physical activity (sessions 9 and 10); and healthy cooking activities (sessions 11 and 12). After each session, teachers were encouraged to develop activities in class that focused on the learned topics. Sociodemographic, anthropometric, dietary, and physical activity assessments were performed at baseline and the end of intervention.

We expect that fewer intervened children become overweight and the consumption of fruit and vegetables will be higher. In addition, we expect a less consumption of low-nutrition high dense foods.

We also expect to provide further support to decrease overweight epidemic, involving classroom teachers in a training intervention and making them dedicated interventionists.

Condition Intervention
Evidence of an Intervention on Childhood BMI z Score Other: Training teachers on healthier lifestyles

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Factorial Assignment
Masking: Double Blind (Participant, Outcomes Assessor)
Primary Purpose: Prevention

Further study details as provided by University of Minho:

Primary Outcome Measures:
  • BMI z score [ Time Frame: the first 3 months after the intervention ]

Secondary Outcome Measures:
  • dietary intake [ Time Frame: within the first 3 months after the intervention ]

Enrollment: 464
Study Start Date: September 2007
Study Completion Date: June 2009
Primary Completion Date: June 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Lifestyle counseling Other: Training teachers on healthier lifestyles
During 2007/2008 seven out of eighty public elementary public schools from Guimarães (Portugal) were invited to participate in this study. The number of schools involved was according to constraints of personnel for the assessment and intervention. Schools were the unit of randomization and three were assigned into intervention, and four into control group. Data was collected prior to intervention and immediately after, during the year 2009 (post-intervention). Prior to participation on data collection, parents provided informed consent, and children provided oral assent.

  Show Detailed Description


Ages Eligible for Study:   5 Years to 12 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Children from the schools involved in the study with informed consent provided by parents.

Exclusion Criteria:

  • Age more than 12
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01397123

Santos Simões group of schools
Guimarães, Braga, Portugal, 4810
Sponsors and Collaborators
University of Minho
Universidade do Porto
Study Director: Pedro Moreira, PhD Universidade do Porto
Study Director: Beatriz Pereira, PhD University of Minho
Principal Investigator: Rafaela V Rosario University of Minho
  More Information

Responsible Party: Rafaela Rosário, University of Minho Identifier: NCT01397123     History of Changes
Other Study ID Numbers: 1845
7613/2008 ( Other Identifier: Portuguese Data Protection Authority )
Study First Received: June 28, 2011
Last Updated: July 18, 2011

Keywords provided by University of Minho:
BMI z-score
school-based intervention
trained teachers
Low nutrition energy dense foods processed this record on June 23, 2017