To date, no reviews have investigated the evidence of tracking of physical activity and
sedentary behavior specifically during early childhood (aged 0–5.9 years) or from early childhood to
middle childhood (aged 6–12 years). It is important to review the evidence of tracking of these
behaviors to determine their stability during the foundational early years of life.
A literature search of studies was conducted in seven electronic databases
(January 1980 to April 2012). Studies were compared on methodologic quality and evidence of
tracking of physical activity or sedentary behavior. Tracking was defined as the stability (or relative
ranking within a cohort) of behaviors, such as physical activity and sedentary behavior, over time.
Eleven studies met the inclusion criteria. All studies reporting physical
activity outcomes had high methodologic quality; 71% of studies reporting sedentary behavior
outcomes had high methodologic quality. Of the tracking coefficients for physical activity, 4% were
large, 60% were moderate, and 36% were small. Of the tracking coefficients for sedentary behavior,
33% were large, 50% were moderate, and 17% were small. Overall, there was evidence of moderate
tracking of physical activity during early childhood, and from early childhood to middle childhood,
and of moderate-to-large tracking of sedentary behavior during early childhood and from early
childhood to middle childhood.
This review highlights the importance of establishing recommended levels of physical
activity and sedentary behavior during the early years of life. Based on this review, the following
recommendations are made: (1) early childhood should be targeted as a critical time to promote
healthy lifestyle behaviors through methodologically sound prevention studies; and (2) future
tracking studies should assess a broad range of sedentary behaviors using objective measures.