Cognitive benefits of higher cardiorespiratory fitness in preadolescent children are associated with increased connectivity within the cingulo-opercular network.

Higher cardiorespiratory fitness has been associated with improved cognitive control in preadolescent children, with various studies highlighting related brain health benefits. This cross-sectional study aimed to provide novel insights into the fitness-cognition relationship by investigating task-related changes in effective connectivity within two brain networks involved in cognitive control: the cingulo-opercular and fronto-parietal networks. Twenty-four higher-fit and twenty-four lower-fit preadolescent children completed a modified flanker task that modulated inhibitory control demand while their EEG and task performance were concurrently recorded. Effective connectivity for correct trials in the theta band was estimated using directed transfer function. The results indicate that children with higher fitness levels demonstrated greater connectivity in specific directions within the cingulo-opercular network (average effect size, d = 0.72). Brain-behavior correlations demonstrated a positive association between the majority of these connections and general task accuracy, which was also higher in higher fit children (average correlation coefficient, ρ = 0.34). The findings further support a positive relationship between fitness and cognitive performance in children. EEG findings offer novel insights into the potential brain mechanisms underlying the fitness-cognition relationship. The study suggests that increased task-related connectivity within the cingulo-opercular network may mediate the cognitive benefits associated with higher fitness levels in preadolescent children.