Affiliations: [a] Emerging Technologies Department, The MITRE Corporation, McLean, VA, USA | [b] Department of Sports Medicine, The MedStar Health Union Memorial Hospital, Baltimore, MD, USA | [c] Center for Applied Biomechanics and Rehabilitation Research, The MedStar Health National Rehabilitation Hospital, Washington, DC, USA | [d] Department of Biomedical Engineering, The Catholic University of America, Washington, DC, USA | [e] Kinesiology Department, Towson University, Towson, MD, USA
Correspondence:
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Corresponding author: E.B. Brokaw, 7525 Colshire Dr., M/S J710, McLean, VA 22102, USA. Tel.: +1 703 983 0176; E-mail: ebrokaw@mitre.org.
Abstract: BACKGROUND: Repeated mild traumatic brain injury (mTBI) has been associated with increased risk of degenerative neurological disorders. While the effects of mTBI and repeated injury are known, studies have only recently started examining repeated subconcussive impacts, impacts that do not result in a clinically diagnosed mTBI. In these studies, repeated subconcussive impacts have been connected to cognitive performance and brain imaging changes. OBJECTIVE: Recent research suggests that performance on a visuomotor tracking (VMT) task may help improve the identification of mTBI. The goal of this study was to investigate if VMT performance is sensitive to the cumulative effect of repeated subconcussive head impacts in collegiate men’s lacrosse players. METHODS: A cross-sectional, prospective study was completed with eleven collegiate men’s lacrosse players. Participants wore helmet-mounted sensors and completed VMT and reaction time assessments. The relationship between cumulative impact metrics and VMT metrics were investigated. RESULTS: In this study, VMT performance correlated with repeated subconcussive head impacts; individuals approached clinically diagnosed mTBI-like performance as the cumulative rotational velocity they experienced increased. CONCLUSION: This suggests that repeated subconcussive impacts can result in measurable impairments and indicates that visuomotor tracking performance may be a useful tool for monitoring the effects of repeated subconcussive impacts.
Keywords: Subconcussive, lacrosse, visuomotor tracking, head injury
