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https://www.readbyqxmd.com/read/29132269/correlation-of-concussion-symptom-profile-with-head-impact-biomechanics-a-case-for-individual-specific-injury-tolerance
#1
Steven Rowson, Stefan M Duma, Brian D Stemper, Alok S Shah, Jason Mihalik, Jaroslaw Harezlak, Larry D Riggen, Christopher C Giza, John DiFiori, Alison Brooks, Kevin K Guskiewicz, Darren Campbell, Jerry McGinty, Steve Svoboda, Ken Cameron, Steven P Broglio, Thomas McAllister, Michael McCrea
Concussion is a brain injury induced by biomechanical forces that is broadly defined as a complex pathophysiological process affecting the brain. The intricate link between biomechanical input and concussion injury response is poorly understood. We aimed to test the hypothesis that greater biomechanical forces would result in the presentation of more concussion-related symptoms that would take longer to resolve. The objective of this study was to investigate the relationship between an array of biomechanical parameters measured for concussive impacts and the presentation and resolution of concussion symptoms...
November 13, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29110265/correction-to-impact-performance-of-modern-football-helmets
#2
David C Viano, Chris Withnall, David Halstead
This erratum is to correct headings listing the impact location and speed in Figs. 5 and 6. The following provides corrected Figs. 5 and 6. The data is unchanged. The authors apologize for any inconvenience this might have caused.
October 25, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29098981/what-is-the-definition-of-sports-related-concussion-a-systematic-review
#3
REVIEW
Paul McCrory, Nina Feddermann-Demont, Jiří Dvořák, J David Cassidy, Andrew McIntosh, Pieter E Vos, Ruben J Echemendia, Willem Meeuwisse, Alexander A Tarnutzer
OBJECTIVES: Various definitions for concussion have been proposed, each having its strengths and weaknesses. We reviewed and compared current definitions and identified criteria necessary for an operational definition of sports-related concussion (SRC) in preparation of the 5th Concussion Consensus Conference (Berlin, Germany). We also assessed the role of biomechanical studies in informing an operational definition of SRC. DESIGN: This is a systematic literature review...
June 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29037104/high-magnitude-head-impact-exposure-in-youth-football
#4
Eamon T Campolettano, Ryan A Gellner, Steven Rowson
OBJECTIVE Even in the absence of a clinically diagnosed concussion, research suggests that neurocognitive changes may develop in football players as a result of frequent head impacts that occur during football games and practices. The objectives of this study were to determine the specific situations in which high-magnitude impacts (accelerations exceeding 40 g) occur in youth football games and practices and to assess how representative practice activities are of games with regard to high-magnitude head impact exposure...
October 17, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28982552/repetitive-head-impacts-do-not-affect-postural-control-following-a-competitive-athletic-season
#5
Nicholas G Murray, Katelyn E Grimes, Eric D Shiflett, Barry A Munkasy, Nathan R D'Amico, Megan E Mormile, Douglas W Powell, Thomas A Buckley
Evidence suggests that Repetitive Head Impacts (RHI) directly influence the brain over the course of a single contact collision season yet do not significantly impact a player's performance on the standard clinical concussion assessment battery. The purpose of this study was to investigate changes in static postural control after a season of RHI in Division I football athletes using more sensitive measures of postural control as compared to a non-head contact sports. Fourteen Division I football players (CON) (age=20...
October 2, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28937917/head-impact-exposure-measured-in-a-single-youth-football-team-during-practice-drills
#6
Mireille E Kelley, Joeline M Kane, Mark A Espeland, Logan E Miller, Alexander K Powers, Joel D Stitzel, Jillian E Urban
OBJECTIVE This study evaluated the frequency, magnitude, and location of head impacts in practice drills within a youth football team to determine how head impact exposure varies among different types of drills. METHODS On-field head impact data were collected from athletes participating in a youth football team for a single season. Each athlete wore a helmet instrumented with a Head Impact Telemetry (HIT) System head acceleration measurement device during all preseason, regular season, and playoff practices...
November 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28884239/nano-composite-foam-sensor-system-in-football-helmets
#7
A Jake Merrell, William F Christensen, Matthew K Seeley, Anton E Bowden, David T Fullwood
American football has both the highest rate of concussion incidences as well as the highest number of concussions of all contact sports due to both the number of athletes and nature of the sport. Recent research has linked concussions with long term health complications such as chronic traumatic encephalopathy and early onset Alzheimer's. Understanding the mechanical characteristics of concussive impacts is critical to help protect athletes from these debilitating diseases and is now possible using helmet-based sensor systems...
September 7, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28771033/the-ability-of-an-aftermarket-helmet-add-on-device-to-reduce-impact-force-accelerations-during-drop-tests
#8
Katherine M Breedlove, Evan Breedlove, Eric Nauman, Thomas G Bowman, Monica R Lininger
CONTEXT:   The Guardian Cap provides a soft covering intended to mitigate energy transfer to the head during football contact. Yet how well it attenuates impacts remains unknown. OBJECTIVE:   To evaluate the changes in the Gadd Severity Index (GSI) and linear acceleration during drop tests on helmeted headforms with or without Guardian Caps. DESIGN:   Crossover study. SETTING:   Laboratory. PATIENTS OR OTHER PARTICIPANTS:   Nine new football helmets sent directly from the manufacturer...
September 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28753688/the-role-of-neck-muscle-activities-on-the-risk-of-mild-traumatic-brain-injury-in-american-football
#9
Xin Jin, Zhaoying Feng, Valerie Mika, Haiyan Li, David C Viano, King H Yang
Concussion, or mild traumatic brain injury (mTBI), is frequently associated with sports activities. It has generally been accepted that neck strengthening exercises are effective as a preventive strategy for reducing sports-related concussion risks. However, the interpretation of the link between neck strength and concussion risks remains unclear. In this study, a typical helmeted head-to-head impact in American football was simulated using the head and neck complex finite element (FE) model. The impact scenario selected was previously reported in lab-controlled incident reconstructions from high-speed video footages of the National Football League using two head-neck complexes taken from Hybrid III dummies...
October 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28742613/the-influence-of-heavier-football-helmet-faceguards-on-head-impact-location-and-severity
#10
Julianne D Schmidt, Tracy T Phan, Ron W Courson, Fred Reifsteck, Eric D Merritt, Cathleen N Brown
OBJECTIVE: To determine whether players with heavier faceguards have increased odds of sustaining top of the head impacts and head impacts of higher severity. DESIGN: Cohort study. SETTING: On-field. PARTICIPANTS: Thirty-five division I collegiate football players. INTERVENTIONS: Faceguard mass was measured. Head impact location and severity (linear acceleration [gravity], rotational acceleration [radian per square second], and Head Impact Technology severity profile [unitless]) were captured for 19 379 total head impacts at practices using the Head Impact Telemetry System...
July 21, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28509764/environmental-and-physiological-factors-affect-football-head-impact-biomechanics
#11
Jason P Mihalik, Adam Z Sumrall, Susan W Yeargin, Kevin M Guskiewicz, Kevin B King, Scott C Trulock, Edgar W Shields
PURPOSE: Recent anecdotal trends suggest a disproportionate number of head injuries in collegiate football players occur during preseason football camp. In warmer climates, this season also represents the highest risk for heat-related illness among collegiate football players. Because concussion and heat illnesses share many common symptoms, we need 1) to understand if environmental conditions, body temperature, and hydration status affect head impact biomechanics; and 2) to determine if an in-helmet thermistor could provide a valid measure of gastrointestinal temperature...
October 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28455786/individual-impact-magnitude-vs-cumulative-magnitude-for-estimating-concussion-odds
#12
Kathryn L O'Connor, Thomas Peeters, Stefan Szymanski, Steven P Broglio
Helmeted impact devices have allowed researchers to investigate the biomechanics of head impacts in vivo. While increased impact magnitude has been associated with greater concussion risk, a definitive concussive threshold has not been established. It is likely that concussion risk is not determined by a single impact itself, but a host of predisposing factors. These factors may include genetics, fatigue, and/or prior head impact exposure. The objective of the current paper is to investigate the association between cumulative head impact magnitude and concussion risk...
April 28, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28387556/long-term-cognitive-and-neuropsychiatric-consequences-of-repetitive-concussion-and-head-impact-exposure
#13
REVIEW
Thomas McAllister, Michael McCrea
Initially, interest in sport-related concussion arose from the premise that the study of athletes engaged in sports associated with high rates of concussion could provide insight into the mechanisms, phenomenology, and recovery from mild traumatic brain injury. Over the last decade, concerns have focused on the possibility that, for some athletes, repetitive concussions may raise the long-term risk for cognitive decline, neurobehavioral changes, and neurodegenerative disease. First conceptualized as a discrete event with variable recovery trajectories, concussion is now viewed by some as a trigger of neurobiological events that may influence neurobehavioral function over the course of the life span...
March 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28377252/impact-of-increased-football-field-width-on-player-high-speed-collision-rate
#14
Jacob R Joseph, Siri S Khalsa, Brandon W Smith, Paul Park
BACKGROUND: High-acceleration head impact is a known risk for mild traumatic brain injury (mTBI) based on studies using helmet accelerometry. In football, offensive and defensive players are at higher risk of mTBI due to increased speed of play. Other collision sport studies suggest that increased playing surface size may contribute to reductions in high-speed collisions. We hypothesized that wider football fields lead to a decreased rate of high-speed collisions. METHODS: Computer football game simulation was developed using MATLAB...
July 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28352493/high-school-football-players-use-their-helmets-to-tackle-other-players-despite-knowing-the-risks
#15
Andrew M Kuriyama, Austin S Nakatsuka, Loren G Yamamoto
There is greater attention to head-related injuries and concussions in American football. The helmet's structural safety and the way that football players use their helmets are important in preventing head injuries. Current strategies include penalizing players for high-risk behavior such as leading with their helmet or hitting an opposing player above the shoulder. Passive strategies include helmet modification to better protect the head of the players or to change the playing style of the players. Hawai'i high school varsity football players were surveyed to determine how they use their helmets and how a new helmet design would affect their style of play...
March 2017: Hawai'i Journal of Medicine & Public Health: a Journal of Asia Pacific Medicine & Public Health
https://www.readbyqxmd.com/read/28319792/safety-regulation-in-professional-football-empirical-evidence-of-intended-and-unintended-consequences
#16
Andrew Hanson, Nicholas A Jolly, Jeremy Peterson
In response to increasing public awareness and negative long-term health effects of concussions, the National Football League implemented the "Crown-of-the-Helmet Rule" (CHR). The CHR imposes penalties on players who initiate contact using the top of the helmet. This paper examines the intended effect of this policy and its potential for unintended consequences. We find evidence supporting the intended effect of the policy- a reduction in weekly concussion reports among defensive players by as much as 32% (34% for all head and neck injuries), but also evidence of an increase in weekly lower extremity injury reports for offensive players by as much as 34%...
May 2017: Journal of Health Economics
https://www.readbyqxmd.com/read/28287543/modified-drop-tower-impact-tests-for-american-football-helmets
#17
G Alston Rush, R Prabhu, Gus A Rush, Lakiesha N Williams, M F Horstemeyer
A modified National Operating Committee on Standards for Athletic Equipment (NOCSAE) test method for American football helmet drop impact test standards is presented that would provide better assessment of a helmet's on-field impact performance by including a faceguard on the helmet. In this study, a merger of faceguard and helmet test standards is proposed. The need for a more robust systematic approach to football helmet testing procedures is emphasized by comparing representative results of the Head Injury Criterion (HIC), Severity Index (SI), and peak acceleration values for different helmets at different helmet locations under modified NOCSAE standard drop tower tests...
February 19, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28254746/what-strategies-can-be-used-to-effectively-reduce-the-risk-of-concussion-in-sport-a-systematic-review
#18
REVIEW
Carolyn A Emery, Amanda M Black, Ash Kolstad, German Martinez, Alberto Nettel-Aguirre, Lars Engebretsen, Karen Johnston, James Kissick, David Maddocks, Charles Tator, Mark Aubry, Jiří Dvořák, Shinji Nagahiro, Kathryn Schneider
AIM OR OBJECTIVE: To examine the effectiveness of concussion prevention strategies in reducing concussion risk in sport. DESIGN: Systematic review according to the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analysis) guidelines. DATA SOURCES: Eleven electronic databases searched and hand-search of references from selected studies. ELIGIBILITY CRITERIA FOR SELECTING STUDIES: The following were the study inclusion criteria: (1) contained original human research data; (2) investigated an outcome of concussion or head impact; (3) evaluated a concussion prevention intervention; (4) included sport participants; (5) analytical study designand (6) peer-reviewed...
June 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28181857/subconcussive-impact-dependent-increase-in-plasma-s100%C3%AE-levels-in-collegiate-football-players
#19
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/28056179/descriptive-characteristics-of-concussions-in-national-football-league-games-2010-2011-to-2013-2014
#20
Michael D Clark, Breton M Asken, Stephen W Marshall, Kevin M Guskiewicz
BACKGROUND: Despite a high reported incidence rate of concussion, little is known about the on-field characteristics of injurious head impacts in National Football League (NFL) games. PURPOSE: To characterize on-field features (location, player position, and time during game) and biomechanical features (anticipation status, closing distance, impact location and type) associated with concussions in NFL games over a 4-season period (2010-2011 to 2013-2014). STUDY DESIGN: Descriptive epidemiology study...
March 2017: American Journal of Sports Medicine
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