Evaluation of a computer-tailored physical activity intervention in adolescents in six European countries: the Activ-O-Meter in the HELENA intervention study.
OBJECTIVE
The present study investigates the effect of the Activ-O-Meter, an internet-based computer-tailored physical activity intervention in adolescents in six European centers involved in the HELENA study.


METHODS
Adolescents (12-17 years old) from Vienna, Ghent, Heraklion, Dortmund, Athens, and Stockholm were randomized into intervention and control schools. Participants in the intervention condition received the computer-tailored advice at baseline and after 1 month. Participants in the control condition received a generic standard advice. Effects were evaluated after 1 (n = 675) and 3 months (n = 494) using multi-level modeling. Physical activity levels were measured using the International Physical Activity Questionnaire for adolescents (IPAQ-A).


RESULTS
After 1 month, the intervention group reported higher levels of moderate (beta = -32.8, 95% CI (confidence interval): -64.2 to -1.4) and vigorous (beta = -28.0, 95% CI: -50.7 to -5.3) physical activity in leisure time, as well as higher levels of cycling for transport (beta = -19.1, 95% CI: -34.4 to -7.6) compared to the control group. After 3 months, when the intervention group had received the tailored feedback twice, intervention effects were even stronger. Favorable changes in physical activity levels of all intensities and in different contexts were found in the tailored group compared to the control group. Among adolescents not reaching the physical activity recommendations at baseline similar effects as in the total sample were found.


CONCLUSIONS
The data indicated that the computer-tailored physical activity intervention had positive effects on physical activity levels among the adolescents. However, the implementation of the computer-tailored intervention in the schools was not feasible in all countries.
De Bourdeaudhuij
Ilse
I
Department of Movement and Sport Sciences, Ghent University, Ghent, Belgium. Ilse.Debourdeaudhuij@UGent.be
Maes
Lea
L
De Henauw
Stefaan
S
De Vriendt
Tineke
T
Moreno
Luis A
LA
Kersting
Mathilde
M
Sarri
Katerina
K
Manios
Yannis
Y
Widhalm
Kurt
K
Sjöstrom
Michael
M
Ruiz
Jonatan R
JR
Haerens
Leen
L
D000293:Adolescent; D002648:Child; D005060:Europe; D015444:Exercise; D005260:Female; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D020407:Internet; D008297:Male; D015397:Program Evaluation; D011795:Surveys and Questionnaires; D014584:User-Computer Interface