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https://www.readbyqxmd.com/read/28509764/environmental-and-physiological-factors-affect-football-head-impact-biomechanics
#1
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. Since 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...
May 15, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28455786/individual-impact-magnitude-vs-cumulative-magnitude-for-estimating-concussion-odds
#2
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
#3
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
#4
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...
April 1, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28352493/high-school-football-players-use-their-helmets-to-tackle-other-players-despite-knowing-the-risks
#5
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
#6
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%...
January 29, 2017: Journal of Health Economics
https://www.readbyqxmd.com/read/28287543/modified-drop-tower-impact-tests-for-american-football-helmets
#7
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
#8
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 Dvorák, 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...
March 2, 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
#9
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
#10
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
https://www.readbyqxmd.com/read/28043957/computational-modelling-of-traumatic-brain-injury-predicts-the-location-of-chronic-traumatic-encephalopathy-pathology
#11
Mazdak Ghajari, Peter J Hellyer, David J Sharp
Traumatic brain injury can lead to the neurodegenerative disease chronic traumatic encephalopathy. This condition has a clear neuropathological definition but the relationship between the initial head impact and the pattern of progressive brain pathology is poorly understood. We test the hypothesis that mechanical strain and strain rate are greatest in sulci, where neuropathology is prominently seen in chronic traumatic encephalopathy, and whether human neuroimaging observations converge with computational predictions...
February 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/27824251/the-influence-of-friction-between-football-helmet-and-jersey-materials-on-force-a-consideration-for-sport-safety
#12
Anthony M Rossi, Tina L Claiborne, Gregory B Thompson, Stacey Todaro
CONTEXT: The pocketing effect of helmet padding helps to dissipate forces experienced by the head, but if the player's helmet remains stationary in an opponent's shoulder pads, the compressive force on the cervical spine may increase. OBJECTIVE: To (1) measure the coefficient of static friction between different football helmet finishes and football jersey fabrics and (2) calculate the potential amount of force on a player's helmet due to the amount of friction present...
September 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27781193/catastrophic-cervical-spine-injuries-in-contact-sports
#13
Michael James Hutton, Robert A McGuire, Robert Dunn, Richard Williams, Peter Robertson, Bruce Twaddle, Patrick Kiely, Andrew Clarke, Keyvan Mazda, Paul Davies, Krystle T Pagarigan, Joseph R Dettori
Study Design Systematic review. Objectives To determine the incidence of catastrophic cervical spine injuries (CCSIs) among elite athletes participating in contact team sports and whether the incidence varies depending on the use of protective gear or by player position. Methods Electronic databases and reference lists of key articles published from January 1, 2000, to January 29, 2016, were searched. Results Fourteen studies were included that reported CCSI in rugby (n = 10), American football (n = 3), and Irish hurling (n = 1)...
November 2016: Global Spine Journal
https://www.readbyqxmd.com/read/27690834/whiplash-injury-or-concussion-a-possible-biomechanical-explanation-for-concussion-symptoms-in-some-individuals-following-a-rear-end-collision
#14
Benjamin S Elkin, James M Elliott, Gunter P Siegmund
Study Design Finite element modeling of experimental data. Background The clinical presentations of whiplash injury and concussion have considerable overlap. Both diagnoses are generally based on presenting signs and symptoms, and a history of neck or head trauma. With incomplete knowledge of the trauma, differentiating between whiplash injury and concussion can be clinically challenging. Objectives To estimate the brain strains that develop during rear-end car crashes, evaluate how these strains vary with different head kinematic parameters, and compare these strains to those generated during potentially concussive football helmet impacts...
October 2016: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/27688951/significance-of-concussions-in-hawai-i-from-land-to-sea
#15
David X Cifu, Olivia K Uchima, Alaina S Davis, Amy E Lower, Jingyu L Jin, Henry L Lew
Head injuries are a particular concern in Hawai'i given the large military population, the presence of many land and water sports such as football and surfing, and the lenient helmet laws for motorcycle and bicycle riders. Physical, psychological, and cognitive symptoms from single or repeated concussions can affect an individual's reentry to society and activity. Current literature indicates that repeated head injuries are associated with chronic traumatic encephalopathy (CTE) which is thought to lead to dementia...
September 2016: Hawai'i Journal of Medicine & Public Health: a Journal of Asia Pacific Medicine & Public Health
https://www.readbyqxmd.com/read/27550390/drill-specific-head-impact-exposure-in-youth-football-practice
#16
Eamon T Campolettano, Steven Rowson, Stefan M Duma
OBJECTIVE Although 70% of football players in the United States are youth players (6-14 years old), most research on head impacts in football has focused on high school, collegiate, or professional populations. The objective of this study was to identify the specific activities associated with high-magnitude (acceleration > 40g) head impacts in youth football practices. METHODS A total of 34 players (mean age 9.9 ± 0.6 years) on 2 youth teams were equipped with helmet-mounted accelerometer arrays that recorded head accelerations associated with impacts in practices and games...
November 2016: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/27511792/increasing-lower-extremity-injury-rates-across-the-2009-2010-to-2014-2015-seasons-of-national-collegiate-athletic-association-football-an-unintended-consequence-of-the-targeting-rule-used-to-prevent-concussions
#17
Robert W Westermann, Zachary Y Kerr, Peter Wehr, Annuziato Amendola
BACKGROUND: Sports-related concussions (SRCs) have gained increased societal interest in the past decade. The National Collegiate Athletic Association (NCAA) has implemented legislation and rule changes to decrease the incidence and risk of head injury impacts. The "targeting" rule forbids initiating contact with the crown of a helmet and targeting defenseless players in the head and neck area; however, there are concerns that this rule change has unintentionally led to an increased incidence of lower extremity injuries...
December 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27456840/the-effects-of-helmet-weight-on-hybrid-iii-head-and-neck-responses-by-comparing-unhelmeted-and-helmeted-impacts
#18
Ron Jadischke, David C Viano, Joe McCarthy, Albert I King
Most studies on football helmet performance focus on lowering head acceleration-related parameters to reduce concussions. This has resulted in an increase in helmet size and mass. The objective of this paper was to study the effect of helmet mass on head and upper neck responses. Two independent test series were conducted. In test series one, 90 pendulum impact tests were conducted with four different headform and helmet conditions: unhelmeted Hybrid III headform, Hybrid III headform with a football helmet shell, Hybrid III headform with helmet shell and facemask, and Hybrid III headform with the helmet and facemask with mass added to the shell (n = 90)...
October 1, 2016: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27432843/head-impact-magnitude-in-american-high-school-football
#19
Julianne D Schmidt, Kevin M Guskiewicz, Jason P Mihalik, J Troy Blackburn, Gunter P Siegmund, Stephen W Marshall
OBJECTIVES: To describe determinants of head impact magnitudes between various play aspects in high school football. METHODS: Thirty-two high school American football players wore Head Impact Telemetry System instrumented helmets to capture head impact magnitude (linear acceleration, rotational acceleration, and Head Impact Technology severity profile [HITsp]). We captured and analyzed video from 13 games (n = 3888 viewable head impacts) to determine the following play aspects: quarter, impact cause, play type, closing distance, double head impact, player's stance, player's action, direction of gaze, athletic readiness, level of anticipation, player stationary, ball possession, receiving ball, and snapping ball...
August 2016: Pediatrics
https://www.readbyqxmd.com/read/27416777/impact-attenuation-capabilities-of-football-and-lacrosse-helmets
#20
Katherine M Breedlove, Evan L Breedlove, Thomas G Bowman, Eric A Nauman
Although the National Operating Committee on Standards for Athletic Equipment (NOCSAE) standards are similar for football and lacrosse helmets, it remains unknown how helmets for each sport compare on drop tests. Due to the increased concern over head injury in sport and the rapid growth in lacrosse participation, it is useful to compare the performance of various football and lacrosse helmets. Therefore, the goal of this study was to document the impact attenuation properties of football and lacrosse helmets and to identify the relative performance between helmets for the two sports...
June 27, 2016: Journal of Biomechanics
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