A pooled analysis of nearly 13,000 young people found that moderate-to-vigorous activity was linked to modest improvements in insulin and cholesterol markers, while effects on weight and blood pressure were less clear.
A large pooled analysis of children and adolescents suggests that moderate-to-vigorous physical activity is linked to better cardiometabolic health, but the effects are modest and vary depending on the statistical approach used.
Researchers reviewed prospective cohort studies and combined participant-level data from 14 groups of young people, totalling 12,874 children and teenagers with an average age of 10.4 years. The participants were followed for an average of just over three years, with activity measured by devices rather than questionnaires, according to the study published in JAMA Pediatrics.
The analysis found that higher levels of moderate-to-vigorous physical activity were associated with lower fasting insulin, LDL cholesterol and triglycerides, as well as a small improvement in a composite cardiometabolic risk score. The authors reported that an increase equivalent to about 26 minutes a day of moderate-to-vigorous activity was linked with these favourable changes. However, the same increase was not associated with changes in body mass index, suggesting that physical activity may improve metabolic health without necessarily affecting weight trends in the short term.
One unexpected finding was that more moderate-to-vigorous activity was associated with a slight rise in systolic blood pressure. Vigorous physical activity showed broadly similar metabolic associations but was not linked with blood pressure in the same way. The investigators also reported that sedentary time was not an important independent predictor of cardiometabolic risk in this age group, even though it was associated with small reductions in blood glucose and systolic blood pressure.
The study adds weight to the case for encouraging regular movement in childhood and adolescence, while also showing that the relationship between activity, sitting time and health markers is more complicated than simple public messages often suggest. Because the associations were described as weak and sensitive to analytical choices, the findings should be read as evidence of a pattern rather than a precise prescription, but they still point towards physical activity as a useful lever for improving metabolic health in young people.
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