Repeated low-level head impacts lead to long-term neurological damage
The preponderance of clinical, animal, and longitudinal studies indicates that repeated low-level head impacts can contribute to cumulative neurological, cognitive, and physiological damage over time.
A substantial body of recent literature (including longitudinal cohort studies, biomarker research, and animal models) supports the claim that repetitive subconcussive and low-level head impacts contribute to cumulative neurological and cognitive impairments. While some acute measures (such as single-session balance tests) show no immediate deficits, the overall evidence clearly leans toward long-term harm.
Thomas McAllister, Michael McCrea. Long-Term Cognitive and Neuropsychiatric Consequences of Repetitive Concussion and Head-Impact Exposure. 2017. https://doi.org/10.4085/1062-6050-52.1.14
Reviews evidence that repetitive head impacts raise the long-term risk of cognitive decline and neurodegenerative disease.
Jaclyn B. Caccese, Fernando V. Santos, Eric Anson, Thomas A. Buckley, Felipe Yamaguchi, Mariana Gongora, John J. Jeka. Repetitive subconcussive head impacts and changes in sensory processing for balance control. 2019. https://doi.org/10.1101/648857
Finds that a single session of repeated soccer heading did not produce acute impairments in sensory processing for balance control.
See more details
Dara Bree, Jennifer Stratton, Dan Levy. Increased severity of closed head injury or repetitive subconcussive head impacts enhances post-traumatic headache-like behaviors in a rat model. 2020. https://doi.org/10.1177/0333102420937664
Shows that repetitive subconcussive head impacts in a rat model lead to prolonged cephalic and extracephalic pain hypersensitivity.
Dara Bree, Jennifer Stratton, Dan Levy. Increased severity of closed head injury or repetitive subconcussive head impacts enhances post-traumatic headache-like behaviors in a rat model. 2020. https://doi.org/10.1101/2020.03.14.979047
Demonstrates that repetitive subconcussive head impacts result in enhanced headache-like behaviors in animal models.
Polet K, Aeschlimann Y, Deslauriers-Gauthier S, Hesse S, Morisot A, Pesce A, Chanalet S, Liberatore M, Faraggi M, Scarlot R, Louchart De La Chapelle S, Paulmier B. Brain Health in Former Professional Motorsport Drivers: Case Series in a Population Exposed to Sport-Related Concussions and Repetitive Head Impacts.. 2026. https://doi.org/10.1186/s40798-026-01036-7
Finds correlations between cumulative motorsport head-impact exposure and neurological or eye-movement abnormalities.
Carron MA, Caplick LE, Dalbo VJ. Subconcussive Head Injuries Negatively Affect Academic Achievement in Adolescent Males.. 2026. https://doi.org/10.3390/children13030399
Provides initial evidence that subconcussive head injuries negatively affect adolescent academic achievement (GPA).
Recht GO, Lima-Cooper G, Buddenbaum CV, Sweeney SH, Bellini ZS, Newman SD, Datta D, Kawata K. Effects of Lifetime Exposure to Sports-Related Head Impacts on Brain Injury and Inflammatory Blood Biomarkers Among Former Middle-Aged Athletes.. 2025. https://doi.org/10.1177/08977151251362101
Indicates that lifetime exposure to sports-related head impacts correlates with biomarkers suggesting long-term neural consequences.
Buddenbaum CV, Recht GO, Sweeney SH, Steinfeldt JA, Ellis G, Zuidema TR, Kercher KA, Bazarian JJ, Newman SD, Kawata K. Mental health trajectory throughout high school football career: a four-year prospective cohort study.. 2025. https://doi.org/10.3389/fpsyt.2025.1723687
Observes that psychological and depression symptoms accumulate over multiple years of high-school football participation.
de Brito MA, Raimundo Fernandes J, Ferreira Costa K, Maurício CA, Ferreira Gonçalves A, de Toledo Nóbrega O, Aedo-Muñhoz E, Brito CJ, Pérez DIV, Miarka B. Long-Term Cognitive Decline in MMA Fighters: A Two-Year Cohort Study on Executive Function Impairments Due to Repetitive Head Strikes.. 2025. https://doi.org/10.3390/ijerph22071004
Highlights significant longitudinal declines in executive functions and mental processing speed among fighters exposed to repetitive head strikes.
The paper trail · every fact has a biography
Challenge the receipt
Citation formatting by citeproc-js (Frank Bennett) and the Citation Style Language project. Source and licenses.
Terms · Privacy · How verdicts work · Dispute this receipt