The Effects of Chronic Exercise on Attentional Networks

Mariño, Laura; Padilla, Concepción; Parmentier, Fabrice B. R.; Andrés, Pilar · 2014 · OpenAlex-citations

DOI: 10.1371/journal.pone.0101478

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Summary

This study investigates whether chronic physical exercise enhances attentional control in healthy young adults, a population for which evidence has been scarce compared to older adults or clinical groups. Building on Posner and Petersen’s model of three independent attentional networks—alerting, orienting, and executive—the researchers hypothesized that long-term aerobic exercise would specifically improve executive functioning, which involves conflict resolution and inhibition. The motivation stemmed from conflicting prior results in young adults, potentially due to insufficient exercise intensity or the use of acute rather than chronic exercise protocols. The experimental design involved 64 healthy young adults (mean age 24.12 years) categorized into physically active (n=31) and passive (n=33) groups. Active participants engaged in cardiovascular activity for at least 10 years, averaging six or more hours per week. Passive participants exercised less than two hours per week for the preceding four years. Cardiovascular fitness was objectively verified using the Rockport 1-mile Fitness Walking test, which estimated VO2max; active participants showed significantly higher fitness levels (mean VO2max 57 vs. 47). Participants completed the Attention Network Task (ANT), a computerized paradigm measuring alerting, orienting, and executive networks through variations in cueing and flanker conditions. Performance was assessed via reaction times (RTs) and error rates. Results indicated a selective benefit of chronic exercise on the executive network. While both groups demonstrated significant alerting and orienting effects, there were no significant differences between active and passive participants in alerting efficiency. For orienting, although passive participants showed a larger orienting effect, this was attributed to a ceiling effect where active participants already exhibited faster baseline responses; controlling for this revealed no true group difference. Crucially, the executive network analysis revealed a significant interaction between group and condition. Active participants exhibited a significantly smaller conflict effect (the difference in RT between incongruent and congruent trials) than passive participants, indicating superior conflict resolution. This advantage was driven by faster responses in incongruent trials for the active group, while congruent trial performance did not differ significantly. Error rate analyses showed no significant group differences for any network. The findings demonstrate that chronic aerobic exercise selectively improves executive attentional control in healthy young adults, specifically enhancing the ability to resolve response conflict. The authors attribute this to the neurophysiological changes associated with long-term exercise, particularly in prefrontal and anterior cingulate regions linked to inhibition. The study highlights the importance of rigorous participant selection and objective fitness verification, noting that previous null findings in young adults may have resulted from insufficient exercise intensity or duration. These results extend evidence of exercise-induced cognitive benefits to healthy young populations, suggesting that chronic exercise creates cognitive reserve that supports executive functioning even when cognitive abilities are at their peak.

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• executive function