Advanced pubertal status at age 11 and lower physical activity in adolescent girls

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It has been known that physical activity tends to decline in girls during adolescence. However, factors which may accelerate this decline have not been extensively studied. In this issue, Baker et al evaluated the impact of timing of onset of puberty on levels of physical activity. They found that girls who experienced pubertal maturation at a younger age have lower levels of physical activity at age 13 than girls who mature at a slower pace. These girls with early maturation may also be at higher risk for the development of obesity. Further research is needed to better understand the mechanisms of the puberty related decline. Clinicians can use these results to identify a group of girls at higher risk to decrease activity who would benefit from counseling on ways to remain active.