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https://www.readbyqxmd.com/read/29125529/cross-sectional-evaluation-of-visuomotor-tracking-performance-following-subconcussive-head-impacts
#1
E B Brokaw, M S Fine, K E Kindschi, A C Santago Ii, P S Lum, M Higgins
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...
November 3, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29077582/neuroimaging-in-the-diagnosis-of-chronic-traumatic-encephalopathy-a-systematic-review
#2
Philip Sparks, Tim Lawrence, Stephan Hinze
OBJECTIVE: Chronic traumatic encephalopathy (CTE) is a neurodegenerative tauopathy associated with repeated subconcussive and concussive head injury. Clinical features include cognitive, behavioral, mood, and motor impairments. Definitive diagnosis is only possible at postmortem. Here, the utility of neuroimaging in the diagnosis of CTE is evaluated by systematically reviewing recent evidence for changes in neuroimaging biomarkers in suspected cases of CTE compared with controls. DATA SOURCES: Providing an update on a previous systematic review of articles published until December 2014, we searched for articles published between December 2014 and July 2016...
October 25, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29073820/acute-changes-in-plasma-total-tau-levels-are-independent-of-subconcussive-head-impacts-in-college-football-players
#3
Keisuke Kawata, Leah H Rubin, Leroy Wesley, Jong Lee, Thomas Sim, Masahiro Takahagi, Al Bellamy, Ryan Tierney, Dianne Langford
Athletes in contact sports sustain repetitive subconcussive head impacts in a brief window, yet neurophysiological sequelae from repetitive subconcussion remain unclear. This prospective longitudinal study examined a relationship between changes in plasma Tau protein levels and subconcussive impact kinematic data in 23 Division-I collegiate football players during a series of pre-season practices. Plasma measures for Tau and S100β proteins, symptom scores, and near point of convergence were obtained at preseason baseline and pre-post practices...
October 26, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28986327/anthropometrics-and-maturity-status-a-preliminary-study-of-youth-football-head-impact-biomechanics
#4
Susan W Yeargin, Payton Kingsley, Jim M Mensch, Jason P Mihalik, Eva V Monsma
CONTEXT: There is a paucity of head impact biomechanics research focusing on youth athletes. Little is known about how youth subconcussive head impact tolerances are related to physical size and maturation. OBJECTIVE: To examine the effects of age, anthropometric and maturational status variability on head impact biomechanics. DESIGN: Cross-sectional. SETTING: Outdoor youth football facilities in South Carolina. PARTICIPANTS: Thirty-four male recreational youth football players, 8 to 13yrs...
October 3, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28878729/structural-functional-and-metabolic-brain-markers-differentiate-collision-versus-contact-and-non-contact-athletes
#5
Nathan W Churchill, Michael G Hutchison, Alex P Di Battista, Simon J Graham, Tom A Schweizer
There is growing concern about how participation in contact sports affects the brain. Retrospective evidence suggests that contact sports are associated with long-term negative health outcomes. However, much of the research to date has focused on former athletes with significant health problems. Less is known about the health of current athletes in contact and collision sports who have not reported significant medical issues. In this cross-sectional study, advanced magnetic resonance imaging (MRI) was used to evaluate multiple aspects of brain physiology in three groups of athletes participating in non-contact sports (N = 20), contact sports (N = 22), and collision sports (N = 23)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28631970/computerized-neuropsychological-test-performance-of-youth-football-players-at-different-positions-a-comparison-of-high-and-low-contact-players
#6
William T Tsushima, Hyeong Jun Ahn, Andrea M Siu, Tama Fukuyama, Nathan M Murata
The aim of this study was to examine the effects of head impact frequency on the neuropsychological test results of football players who participate in different positions on the team. Based on the biomechanical measures of head impact frequency reported in high school football, a High Contact group (n = 480) consisting of offensive and defensive linemen was compared with a Low Contact group (n = 640) comprised of receivers and defensive backs. The results revealed that the High Contact group obtained poorer performances on the Immediate Post-Concussion Assessment and Cognitive Testing (ImPACT) on three Composite scores (Verbal Memory, Visual Motor Speed, Impulse Control) and the Total Symptom score compared to the Low Contact group...
February 28, 2017: Applied Neuropsychology. Child
https://www.readbyqxmd.com/read/28452600/comparison-of-neurocognitive-performance-in-contact-and-noncontact-nonconcussed-high-school-athletes-across-a-two-year-interval
#7
Benjamin L Brett, Gary S Solomon
Investigating short-term effects of subconcussive impacts on neurocognitive functioning, we employed a repeated measures multivariate model and regression-based measure to examine neurocognitive changes in 771 contact and noncontact high school athletes over a two-year period. Results reveal significant changes in Visual Motor Speed for both groups over a two-year period, with small effect sizes. According to regression-based measures, differences in contact sport athletes' expected Time 2 performances were significant for Visual Motor Speed, also with minimal effects...
2017: Developmental Neuropsychology
https://www.readbyqxmd.com/read/28393012/the-effect-of-repetitive-subconcussive-collisions-on-brain-integrity-in-collegiate-football-players-over-a-single-football-season-a-multi-modal-neuroimaging-study
#8
Semyon M Slobounov, Alexa Walter, Hans C Breiter, David C Zhu, Xiaoxiao Bai, Tim Bream, Peter Seidenberg, Xianglun Mao, Brian Johnson, Thomas M Talavage
The cumulative effect of repetitive subconcussive collisions on the structural and functional integrity of the brain remains largely unknown. Athletes in collision sports, like football, experience a large number of impacts across a single season of play. The majority of these impacts, however, are generally overlooked, and their long-term consequences remain poorly understood. This study sought to examine the effects of repetitive collisions across a single competitive season in NCAA Football Bowl Subdivision athletes using advanced neuroimaging approaches...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28269777/what-is-the-relationship-of-traumatic-brain-injury-to-dementia
#9
REVIEW
Mario F Mendez
There is a long history linking traumatic brain injury (TBI) with the development of dementia. Despite significant reservations, such as recall bias or concluding causality for TBI, a summary of recent research points to several conclusions on the TBI-dementia relationship. 1) Increasing severity of a single moderate-to-severe TBI increases the risk of subsequent Alzheimer's disease (AD), the most common type of dementia. 2) Repetitive, often subconcussive, mild TBIs increases the risk for chronic traumatic encephalopathy (CTE), a degenerative neuropathology...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28225689/sex-differences-in-anthropometrics-and-heading-kinematics-among-division-i-soccer-athletes
#10
Abigail C Bretzin, Jamie L Mansell, Ryan T Tierney, Jane K McDevitt
BACKGROUND: Soccer players head the ball repetitively throughout their careers; this is also a potential mechanism for a concussion. Although not all soccer headers result in a concussion, these subconcussive impacts may impart acceleration, deceleration, and rotational forces on the brain, leaving structural and functional deficits. Stronger neck musculature may reduce head-neck segment kinematics. HYPOTHESIS: The relationship between anthropometrics and soccer heading kinematics will not differ between sexes...
March 2017: Sports Health
https://www.readbyqxmd.com/read/28181857/subconcussive-impact-dependent-increase-in-plasma-s100%C3%AE-levels-in-collegiate-football-players
#11
Keisuke Kawata, Leah H Rubin, Masahiro Takahagi, Jong Hyun Lee, Thomas Sim, Victor Szwanki, Al Bellamy, Ryan Tierney, Dianne Langford
The current study investigates whether repetitive subconcussive impacts cause changes in plasma S100β levels, and also tests the associations between S100β changes and frequency/magnitude of impacts sustained. This prospective study of 22 Division-I collegiate football players included baseline and pre-season practices (one helmet-only and four full-gear). Blood samples were obtained and assessed for S100β levels at baseline and pre- to post-practices; symptom scores were assessed at each time-point. An accelerometer-embedded mouthguard was employed to measure the number of impacts (hits), peak linear acceleration (PLA), and peak rotational acceleration (PRA)...
April 27, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28148628/heading-in-soccer-more-than-a-subconcussive-event
#12
EDITORIAL
Hester Lingsma, Andrew Maas
No abstract text is available yet for this article.
February 28, 2017: Neurology
https://www.readbyqxmd.com/read/28060567/correlation-of-head-impacts-to-change-in-balance-error-scoring-system-scores-in-division-i-men-s-lacrosse-players
#13
Theresa L Miyashita, Eleni Diakogeorgiou, Kaitlyn Marrie
BACKGROUND: Investigation into the effect of cumulative subconcussive head impacts has yielded various results in the literature, with many supporting a link to neurological deficits. Little research has been conducted on men's lacrosse and associated balance deficits from head impacts. HYPOTHESES: (1) Athletes will commit more errors on the postseason Balance Error Scoring System (BESS) test. (2) There will be a positive correlation to change in BESS scores and head impact exposure data...
July 2017: Sports Health
https://www.readbyqxmd.com/read/27893897/imaging-of-glial-cell-activation-and-white-matter-integrity-in-brains-of-active-and-recently-retired-national-football-league-players
#14
Jennifer M Coughlin, Yuchuan Wang, Il Minn, Nicholas Bienko, Emily B Ambinder, Xin Xu, Matthew E Peters, John W Dougherty, Melin Vranesic, Soo Min Koo, Hye-Hyun Ahn, Merton Lee, Chris Cottrell, Haris I Sair, Akira Sawa, Cynthia A Munro, Christopher J Nowinski, Robert F Dannals, Constantine G Lyketsos, Michael Kassiou, Gwenn Smith, Brian Caffo, Susumu Mori, Tomas R Guilarte, Martin G Pomper
Importance: Microglia, the resident immune cells of the central nervous system, play an important role in the brain's response to injury and neurodegenerative processes. It has been proposed that prolonged microglial activation occurs after single and repeated traumatic brain injury, possibly through sports-related concussive and subconcussive injuries. Limited in vivo brain imaging studies months to years after individuals experience a single moderate to severe traumatic brain injury suggest widespread persistent microglial activation, but there has been little study of persistent glial cell activity in brains of athletes with sports-related traumatic brain injury...
January 1, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/27853132/traumatic-brain-injuries
#15
REVIEW
Kaj Blennow, David L Brody, Patrick M Kochanek, Harvey Levin, Ann McKee, Gerard M Ribbers, Kristine Yaffe, Henrik Zetterberg
Traumatic brain injuries (TBIs) are clinically grouped by severity: mild, moderate and severe. Mild TBI (the least severe form) is synonymous with concussion and is typically caused by blunt non-penetrating head trauma. The trauma causes stretching and tearing of axons, which leads to diffuse axonal injury - the best-studied pathogenetic mechanism of this disorder. However, mild TBI is defined on clinical grounds and no well-validated imaging or fluid biomarkers to determine the presence of neuronal damage in patients with mild TBI is available...
November 17, 2016: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/27829969/chronic-traumatic-encephalopathy-in-athletes-involved-with-high-impact-sports
#16
Cyrus Safinia, Eric M Bershad, H Brent Clark, Karen SantaCruz, Naila Alakbarova, Jose I Suarez, Afshin A Divani
BACKGROUND AND PURPOSE: Chronic traumatic encephalopathy (CTE) is a neurodegenerative disease occurring most commonly in athletes and is caused by repeated concussive or subconcussive blows to the head. The main purpose of this review is to evaluate the published literature on chronic traumatic encephalopathy (CTE) in athletes participating in high-impact sports. In particular, we highlight the significance of concussive and subconcussive impacts in multiple sports, elucidate the differences between clinical/pathological features of CTE and related neurodegenerative diseases, and provide an explanation for the variation in clinical presentation between athletes of different sports...
October 2016: Journal of Vascular and Interventional Neurology
https://www.readbyqxmd.com/read/27815240/persistent-effects-of-playing-football-and-associated-subconcussive-head-trauma-on-brain-structure-and-function-a-systematic-review-of-the-literature
#17
REVIEW
A A Tarnutzer, D Straumann, P Brugger, N Feddermann-Demont
AIM/OBJECTIVE: There is ongoing controversy about persistent neurological deficits in active and former football (soccer) players. We reviewed the literature for associations between football activities (including heading/head injuries) and decline in brain structure/function. DESIGN: Systematic literature review. DATA SOURCES: MEDLINE, Embase, PsycINFO, CINAHL, Cochrane-CRCT, SportDiscus, Cochrane-DSR=4 (accessed 2 August 2016). ELIGIBILITY CRITERIA FOR SELECTING STUDIES: Original studies reporting on football-related persistent effects on brain structure/function...
November 4, 2016: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/27775478/subconcussive-head-impact-exposure-and-white-matter-tract-changes-over-a-single-season-of-youth-football
#18
Naeim Bahrami, Dev Sharma, Scott Rosenthal, Elizabeth M Davenport, Jillian E Urban, Benjamin Wagner, Youngkyoo Jung, Christopher G Vaughan, Gerard A Gioia, Joel D Stitzel, Christopher T Whitlow, Joseph A Maldjian
Purpose To examine the effects of subconcussive impacts resulting from a single season of youth (age range, 8-13 years) football on changes in specific white matter (WM) tracts as detected with diffusion-tensor imaging in the absence of clinically diagnosed concussions. Materials and Methods Head impact data were recorded by using the Head Impact Telemetry system and quantified as the combined-probability risk-weighted cumulative exposure (RWECP). Twenty-five male participants were evaluated for seasonal fractional anisotropy (FA) changes in specific WM tracts: the inferior fronto-occipital fasciculus (IFOF), inferior longitudinal fasciculus, and superior longitudinal fasciculus (SLF)...
December 2016: Radiology
https://www.readbyqxmd.com/read/27297660/white-matter-changes-and-confrontation-naming-in-retired-aging-national-football-league-athletes
#19
Jeremy F Strain, Nyaz Didehbani, Jeffrey Spence, Heather Conover, Elizabeth K Bartz, Sethesh Mansinghani, Myrtle K Jeroudi, Neena K Rao, Lindy M Fields, Michael A Kraut, C Munro Cullum, John Hart, Kyle B Womack
Using diffusion tensor imaging (DTI), we assessed the relationship of white matter integrity and performance on the Boston Naming Test (BNT) in a group of retired professional football players and a control group. We examined correlations between fractional anisotropy (FA) and mean diffusivity (MD) with BNT T-scores in an unbiased voxelwise analysis processed with tract-based spatial statistics (TBSS). We also analyzed the DTI data by grouping voxels together as white matter tracts and testing each tract's association with BNT T-scores...
January 15, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/27281278/quantifying-head-impacts-in-collegiate-lacrosse
#20
Bryson B Reynolds, James Patrie, Erich J Henry, Howard P Goodkin, Donna K Broshek, Max Wintermark, T Jason Druzgal
BACKGROUND: Concussion and repetitive head impact in sports has increased interest and concern for clinicians, scientists, and athletes. Lacrosse is the fastest growing sport in the United States, but the burden of head impact in lacrosse is unknown. PURPOSE: The goal of this pilot study was to quantify head impact associated with practicing and playing collegiate lacrosse while subjects were fitted with wearable accelerometers. STUDY DESIGN: Descriptive epidemiology study...
November 2016: American Journal of Sports Medicine
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