What question did this study set out to answer?

To quantify objective levels of physical activity in preschool children and assess the tracking of physical activity over a 1-year follow-up period.

Objectively Measured Physical Activity in a Representative Sample of 3‐ to 4‐Year‐Old Children

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Longitudinal cohort study observes activity levels and modest tracking in preschool children over one year, highlighting early gender differences.

To quantify objective levels of physical activity in preschool children and assess the tracking of physical activity over a 1-year follow-up period.
Assessed physical activity using the Computer Science and Applications accelerometer worn over 3 days in 3- to 4-year-olds (n = 104; 52 boys; mean age 3.7 ± 0.4 years) in Scotland.
Repeated accelerometry assessments 1 year later in a longitudinal subsample of 60 children (30 boys).
At baseline, boys had significantly higher total activity than girls (mean 777 ± 207 vs. 657 ± 172 counts/minute, p < 0.001).
Total activity correlated positively with age at baseline (r = 0.37, p = 0.007) and increased longitudinally over 1 year to 849 ± 252 counts/minute (paired Student's t test, p < 0.001).
One-year physical activity tracking showed a modest rank order correlation of r = 0.40 (p < 0.001).

Jackson et al. (2003) studied this question.

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Longitudinal cohort study observes activity levels and modest tracking in preschool children over one year, highlighting early gender differences.