The associations of body composition, fitness, and physical activity with balance in children: The Arkansas Active Kids study.
Florêncio Diniz-Sousa, Timothy Edwards, Eva C Diaz and 2 others
PMID 39908751WHAT IT FOUND
Higher fat mass and waist circumference are linked to worse standing balance in children.
However, greater leg strength, aerobic fitness, and participation in organized activities weaken this link. These factors may buffer the balance deficits associated with excess body mass.
Key findings
01Fat mass percentage and waist circumference were the strongest predictors of poor balance, specifically associated with increased body sway velocity and area.
02Knee extension strength, peak oxygen uptake, and time spent in organized activities modulated the relationship between fat mass and balance, minimizing the negative impact of excess body mass.
03The study did not find that excess body mass disproportionately impaired balance when visual input was removed or surfaces were unstable, challenging the somatosensory impairment hypothesis.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The cross-sectional design cannot establish causality; it is unclear if poor fitness leads to worse balance or if children with poor balance engage in less activity. Balance was assessed only in static standing conditions, so findings may not apply to dynamic functional tasks like walking or running. The study did not directly measure sensory function (e.g., plantar sensitivity), so the mechanism behind the balance deficits remains theoretical. The physical activity questionnaire used had no documented psychometric properties.
Declared interests
None declared. The study was supported by the National Institutes of Health (Extramural).
The easy way to misread this
Do not interpret the lack of association between total moderate-to-vigorous physical activity and balance as evidence that exercise is ineffective. The study found that specific components like strength, aerobic capacity, and organized activity participation significantly moderated the negative effects of fat mass on balance, even when total activity volume did not show a direct main effect.