Fiabilidad y validez de un cuestionario en pantalla de conducta sedentaria de los adolescentes

Título: Reliability and validity of a screen time-based sedentary behaviour questionnaire for adolescents: The HELENA study

Resumen :

Background: Although there is a growing interest in the epidemiology of sedentary behaviours, it is unknown whether sedentary behaviour questionnaires are broad markers of sedentary time. The aims of this study were to determine the: (i) reliability of the Healthy Lifestyle in Europe by Nutrition in Adolescence (HELENA) screen time-based sedentary behaviour questionnaire; and (ii) its validity, i.e. the ability of the questionnaire to correctly rank adolescents according to the objectively measured sedentary time. Methods: A total of 183 adolescents (104 females aged 12.5-17.5 years) were involved in the reliability study. Participants completed the HELENA sedentary questionnaire twice (1 week apart). The validity study comprised 2048 (1212 females) adolescents (12.5-17.5 years of age) included in the HELENA cross-sectional study. Questions included television viewing, computer games, console games, Internet for study and non-study reasons and study during week and weekend days. We compared median values of sedentary time, using accelerometers, by tertiles of self-reported sedentary behaviours and their sum (composite sedentary score). Results: Reliability study: kappa-values showed a good agreement (> 0.7), except for Internet for study reasons (0.46 weekdays, 0.33 weekend). The questionnaire correctly classified boys' sedentary time when analysed by specific behaviours and by a composite sedentary score. In girls, median values of objectively measured sedentary time were not different across tertiles of self-reported sedentary behaviours or the composite sedentary score. Conclusion: The HELENA sedentary questionnaire is reliable, yet only correctly classifies objectively measured sedentary time in boys.

Autores : Rey-Lopez J.P.; Ruiz J.R.; Ortega F.B.; Verloigne M,; Vicente-Rodriguez G.; Gracia-Marco L.; Gottrand F.; Molnar D.; Widhalm K.; Zaccaria M.; Cuenca-Garcia M.; Sjostrom M.; De Bourdeaudhuij I.; Moreno L.A.

Direcciones :

1. Departamento de Fisioterapia y Enferemería, Universidad de Zaragoza, Zaragoza (España)

2. Departamendo de Biociencia y Nutrición, Instituto Karolinska, Huddinge (Suecia)

3. Departamento de Actidud Física y del Deporte, Universidad de Granada, Granada (España)

4. Departamento de fisiología médica, Universidad de Granada, Granada (España)

5. Departamento del Movimiento y la Ciencia del Deporte, Universidad de Ghent, Ghent (Bélgica)

6. Facultat de Medicina, Universidad de Lille, Lille (Francia)

7. Universidad de Lille 2, Lille (Francia)

8. Facultat de Medicina, Universidad de Pecs, Pecs (Hungría)

9. Universidad de Medicina deVienna, Vienna, Austria

10. Unidad de Nutrición, INRAN, Rome (Italia)