Healthy Lifestyle in Europe by Nutrition in Adolescence (HELENA) Study: Methodological Aspects

Preface by the HELENA coordinator

• L A Moreno

Preface by Guest Editors

• F Branca
• B M Popkin
• A P Simopoulos

Design and implementation of the Healthy Lifestyle in Europe by Nutrition in Adolescence Cross-Sectional Study

• L A Moreno
• S De Henauw
• on behalf of the HELENA Study Group

Quality assurance of ethical issues and regulatory aspects relating to good clinical practices in the HELENA Cross-Sectional Study

• L Béghin
• M Castera
• on behalf of the HELENA Study Group

Socioeconomic questionnaire and clinical assessment in the HELENA Cross-Sectional Study: methodology

• C Iliescu
• L Béghin
• on behalf of the HELENA Study Group

Development and evaluation of a self-administered computerized 24-h dietary recall method for adolescents in Europe

• C A Vereecken
• M Covents
• on behalf of the HELENA Study Group

Food and nutrient intake, nutritional knowledge and diet-related attitudes in European adolescents

• M Kersting
• W Sichert-Hellert
• on behalf of the HELENA Study Group

Concurrent validity of a modified version of the International Physical Activity Questionnaire (IPAQ-A) in European adolescents: The HELENA Study

• M Hagströmer
• P Bergman
• on behalf of the HELENA Study Group

Reliability of health-related physical fitness tests in European adolescents. The HELENA Study

• F B Ortega
• E G Artero
• on behalf of the HELENA Study Group

Harmonization process and reliability assessment of anthropometric measurements in a multicenter study in adolescents

• E Nagy
• G Vicente-Rodriguez
• on behalf of the HELENA Study Group

Sampling and processing of fresh blood samples within a European multicenter nutritional study: evaluation of biomarker stability during transport and storage

• M González-Gross
• C Breidenassel
• on behalf of the HELENA Study Group

A feasibility study of using a diet optimization approach in a web-based computer-tailoring intervention for adolescents

• L Maes
• C A Vereecken
• on behalf of the HELENA Study Group

HELENA Study Group