This
thesis aimed to answer two research questions:
1. How is the physical environment associated with PA behaviour
among adolescents?
2. What are the effects of a computer-tailored intervention
(YouRAction) that targets individual level factors and of a
computer-tailored intervention that targets individual and environmental
level factors on compliance with the MVPA guideline among Dutch
adolescents?
It was concluded that there is no evidence for a direct association
between the objectively measured physical environment and PA among urban
adolescents. However, even though there was no direct association
between the physical environment and PA among adolescents, the physical
environment was found to be an important factor in combination with
social environmental or cognitive factors. When adolescents had a high
intention or high level of NSC in combination with high availability of
facilities, they were more likely to participate in sports or increase
their sports participation. It was also concluded that the YouRAction
and YouRAction+e interventions were not effective in increasing
compliance to the MVPA guideline, which might be due to sub-optimal
implementation of the intervention.
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