Document Type : Original Article


Child Growth and Development Research Center, Research Institute for Primordial Prevention of Non‑communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran


BACKGROUND: Sedentary habits may increase the noncommunicable disease risk factors, and
few teens get enough physical activity. Therefore, the current study aimed to examine the effects
of a web‑based intervention on the promotion of physical activity among adolescents using the
transtheoretical model (TTM).
METHODS AND MATERIALS: A quasi‑experimental study was conducted on 278 high school students
who were randomly allocated into one of the three groups: two web‑based intervention groups. The
intervention groups 1 and 2 received education through web (, but the second
group received educational strategies based on TTM. Five questionnaires were applied two times
before the intervention and 6 months after the intervention. And, in the control group, the data were
collected using stage of exercise behavior change questionnaire and the International Physical Activity
Questionnaire. Student’s t‑test and two‑way analysis of variance, and McNemar’s test were applied
to compare before and after the intervention. P < 0.05 was considered statistically significant.
RESULTS: The mean differences for TTM constructs related to exercise behaviors (processes of
change, self‑efficacy, and decisional balance) in intervention groups 1 and 2 were very higher than
the control group. Participants in intervention groups 1 and 2 who had low or moderate physical
activity before the intervention were placed in high physical activity after it.
CONCLUSION: According to the obtained results, education on PA based on website effective, but
if we use education based on TTM, it will be more useful on the behavior.


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