Population
557 adolescents in western Norway, 13 years of age at baseline
Design
Cohort
Follow-up
8 years
Authors
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Weak tracking of activity through adolescence cautions against one-time interventions; leaves open optimal timing for sustained behavior change.
Physical activity levels show a weak degree of tracking through adolescence, with the least active individuals in early adolescence being the least likely to change.
Anderssen et al. (2005) studied this question.
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