title: Aerobic fitness and intra-individual variability of neurocognition in preadolescent children.
abstract: This study examined behavioral and neuroelectric intra-individual variability (IIV) in preadolescent children during a task requiring variable amounts of cognitive control. The current study further examined whether IIV was moderated by aerobic fitness level. Participants performed a modified flanker task, comprised of congruent and incongruent arrays, within compatible and incompatible stimulus-response conditions. Results revealed that congruent, relative to incongruent, conditions were associated with less IIV of RT. Further, less IIV of RT, P3 amplitude, and P3 latency was observed for the compatible relative to the incompatible condition. Higher fitness was associated with shorter and less variable RT only for the incompatible condition, with no fitness-related differences observed for P3 variability. The findings suggest that conditions requiring greater cognitive control are associated with increased IIV, and that higher fitness may be associated with greater integrity of cognitive control systems during development.
authors.affiliation: Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Illinois, United States.
authors.forename: Robert Davis
authors.initials: RD
authors.lastname: Moore
authors.forename: Chien-Ting
authors.initials: CT
authors.lastname: Wu
authors.forename: Matthew B
authors.initials: MB
authors.lastname: Pontifex
authors.forename: Kevin C
authors.initials: KC
authors.lastname: O'Leary
authors.forename: Mark R
authors.initials: MR
authors.lastname: Scudder
authors.forename: Lauren B
authors.initials: LB
authors.lastname: Raine
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Johnson
authors.forename: Charles H
authors.initials: CH
authors.lastname: Hillman
mesh_terms: D001921:Brain / Q000502:physiology*; D002648:Child; D003071:Cognition / Q000502:physiology*; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D015444:Exercise / Q000502:physiology / Q000523:psychology; D005260:Female; D006801:Humans; D007206:Individuality; D007360:Intelligence / Q000502:physiology*; D008297:Male; D008451:Maximal Voluntary Ventilation / Q000502:physiology; D009483:Neuropsychological Tests; D010101:Oxygen Consumption / Q000502:physiology; D010809:Physical Fitness / Q000502:physiology* / Q000523:psychology; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time / Q000502:physiology