Evidence map›Paper›PMID 33563361›Full record

ArticleJournal of the International Neuropsychological Society : JINS2022

Disparate Associations of Years of Football Participation and a Metric of Head Impact Exposure with Neurobehavioral Outcomes in Former Collegiate Football Players.

Benjamin L Brett, Amy M Nader, Zachary Y Kerr, Avinash Chandran, Samuel R Walton, J D DeFreese, Kevin M Guskiewicz, Michael McCrea

Open access · greenAbstract read
In one paragraph

Article in Journal of the International Neuropsychological Society : JINS, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.

0numbers the graph read from it
0cells of the map it votes in
14citing papers in PubMed
2.4field-weighted citation impact, top 11% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

14 citing papers in PubMed, 24 citations in OpenAlex.

  1. Article
  2. Factors associated with subjective cognitive complaints in former American football players.Journal of the International Neuropsychological Society : JINS · 2026
    Article
  3. Review
  4. Article
  5. Article
  6. Article
  7. Comparison of Various Metrics of Repetitive Head Impact Exposure And Their Associations With Neurocognition in Collegiate-Aged Athletes.Archives of clinical neuropsychology : the official journal of the National Academy of Neuropsychologists · 2023
    Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Observational
  14. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 2 institutions in 1 country.

Benjamin L BrettDepartment of Neurosurgery, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.ORCID 0000-0003-2849-4658
Amy M NaderDepartment of Neurosurgery, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.
Zachary Y KerrDepartment of Exercise and Sport Science, University of North Carolina, Fetzer Hall, 210 South Rd, Chapel Hill, NC 27514, USA.
Avinash ChandranDepartment of Exercise and Sport Science, University of North Carolina, Fetzer Hall, 210 South Rd, Chapel Hill, NC 27514, USA.
Samuel R WaltonDepartment of Exercise and Sport Science, University of North Carolina, Fetzer Hall, 210 South Rd, Chapel Hill, NC 27514, USA.
J D DeFreeseDepartment of Exercise and Sport Science, University of North Carolina, Fetzer Hall, 210 South Rd, Chapel Hill, NC 27514, USA.
Kevin M GuskiewiczDepartment of Exercise and Sport Science, University of North Carolina, Fetzer Hall, 210 South Rd, Chapel Hill, NC 27514, USA.
Michael McCreaDepartment of Neurosurgery, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.
University of North Carolina at Chapel Hill · USMedical College of Wisconsin · US

Funding

Clinical and Translational Science AwardUL1TR001436 · NCATS · MEDICAL COLLEGE OF WISCONSIN · PI FREED, JULIE K · 2015 to 2025
$47.5M
NCATS NIH HHS UL1 TR001436NINDS NIH HHS L30 NS113158
6 · The paper itself

Abstract

objectivesYears of sport participation (YoP) is conventionally used to estimate cumulative repetitive head impacts (RHI) experienced by contact sport athletes. The relationship of this measure to other estimates of head impact exposure and the potential associations of these measures with neurobehavioral functioning are unknown. We investigated the association between YoP and the Head Impact Exposure Estimate (HIEE), and whether associations between the two estimates of exposure and neurobehavioral functioning varied.

methodsFormer American football players (N = 58; age = 37.9 ± 1.5 years) completed in-person evaluations approximately 15 years following sport discontinuation. Assessments consisted of neuropsychological assessment and structured interviews of head impact history (i.e., HIEE). General linear models were fit to test the association between YoP and the HIEE, and their associations with neurobehavioral outcomes.

resultsYoP was weakly correlated with the HIEE, p = .005, R2 = .13. Higher YoP was associated with worse performance on the Symbol Digit Modalities Test, p = .004, R2 = .14, and Trail Making Test-B, p = .001, R2 = .18. The HIEE was associated with worse performance on the Delayed Recall trial of the Hopkins Verbal Learning Test-Revised, p = .020, R2 = .09, self-reported cognitive difficulties (Neuro-QoL Cognitive Function), p = .011, R2 = .10, psychological distress (Brief Symptom Inventory-18), p = .018, R2 = .10, and behavioral regulation (Behavior Rating Inventory of Executive Function for Adults), p = .017, R2 = .10.

conclusionsYoP was marginally associated with the HIEE, a comprehensive estimate of head impacts sustained over a career. Associations between each exposure estimate and neurobehavioral functioning outcomes differed. Findings have meaningful implications for efforts to accurately quantify the risk of adverse long-term neurobehavioral outcomes potentially associated with RHI.

Indexed as

Athletic InjuriesBrain ConcussionFootballSoccerAdultAthletesHumansQuality of LifeConcussionContact sport participationHead injuryRepetitive head impactsTBI

Identifiers

PMID33563361
PMCPMC8353007
OpenAlexW3127157319

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.