Head impact exposure in collegiate football players

Crisco, Joseph J.; Wilcox, Bethany J.; Beckwith, Jonathan G.; Chu, Jeffrey J.; Duhaime, Ann Christine; Rowson, Steven; Duma, Stefan M.; Maerlender, Arthur C.; McAllister, Thomas W.; Greenwald, Richard M.

doi:10.1016/j.jbiomech.2011.08.003

Cited by 233 publications

(238 citation statements)

References 24 publications

(58 reference statements)

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“…48,49,64,68,71 Defensive-line players sustained more impacts per session than offensive linemen, offensive-skill players, and defensive-skill players. Defensive-line players also had impacts of greater linear magnitudes than did defensive-skill and offensiveline players.…”

Section: Normative Datamentioning

confidence: 97%

“…Football. Collegiate football athletes sustained 420 to 1177 impacts, 48,55 with 9.4 impacts per session 49 at a median linear magnitude of 19g 50 and average 73 Linear magnitudes averaged 26g, 71 with a median of 22g. 74 Angular magnitudes averaged 71,72 1627 to 1694 rad/s 2 and had a median value 74 of 973 rad/s 2 .…”

Section: Normative Datamentioning

confidence: 99%

“…73 Whereas quarterbacks sustained the fewest overall impacts, they had the greatest linear magnitudes, and tight ends, running backs, and linebackers had the greatest angular values. 48,71 Ice Hockey. Collegiate ice hockey players sustained 170 to 347 impacts per season.…”

Section: Normative Datamentioning

confidence: 99%

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Head-Impact–Measurement Devices: A Systematic Review

O’Connor

Rowson

Duma

et al. 2017

Journal of Athletic Training

Self Cite

154

117

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Context: With an estimated 3.8 million sport-and recreation-related concussions occurring annually, targeted prevention and diagnostic methods are needed. Biomechanical analysis of head impacts may provide quantitative information that can inform both prevention and diagnostic strategies.Objective: To assess available head-impact devices and their clinical utility.Data Sources: We performed a systematic search of the electronic database PubMed for peer-reviewed publications, using the following phrases: accelerometer and concussion, head impact telemetry, head impacts and concussion and sensor, head impacts and sensor, impact sensor and concussion, linear acceleration and concussion, rotational acceleration and concussion, and xpatch concussion. In addition to the literature review, a Google search for head impact monitor and concussion monitor yielded 15 more devices.Study Selection: Included studies were performed in vivo, used commercially available devices, and focused on sportrelated concussion.Data Extraction: One author reviewed the title and abstract of each study for inclusion and exclusion criteria and then reviewed each full-text article to confirm inclusion criteria. Controversial articles were reviewed by all authors to reach consensus.Data Synthesis: In total, 61 peer-reviewed articles involving 4 head-impact devices were included. Participants in boxing, football, ice hockey, soccer, or snow sports ranged in age from 6 to 24 years; 18% (n ¼ 11) of the studies included female athletes. The Head Impact Telemetry System was the most widely used device (n ¼ 53). Fourteen additional commercially available devices were presented.Conclusions: Measurements collected by impact monitors provided real-time data to estimate player exposure but did not have the requisite sensitivity to concussion. Proper interpretation of previously reported head-impact kinematics across age, sport, and position may inform future research and enable staff clinicians working on the sidelines to monitor athletes. However, head-impact-monitoring systems have limited clinical utility due to error rates, designs, and low specificity in predicting concussive injury.

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Section: Normative Datamentioning

confidence: 97%

Section: Normative Datamentioning

confidence: 99%

See 1 more Smart Citation

Head-Impact–Measurement Devices: A Systematic Review

O’Connor

Rowson

Duma

et al. 2017

Journal of Athletic Training

Self Cite

154

117

View full text Add to dashboard Cite

show abstract

“…However, Broglio et al set the cut-off value at 15 g 20) , and the study performed by value. In this study, we removed the data with a peak LA less than 10 g. In previous studies as well, the data with a peak LA of 10 g or less were removed because these data included noncontact motions such as quick stand-up, running, and jumping 41) . However, the data with a peak LA less than 10 g amounted to 9.7% of the total number of impacts.…”

Section: Discussionmentioning

confidence: 99%

Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration -

Fukuda

Koike

Miyakawa

et al. 2017

JPFSM

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The aim of this study is to understand the head impact during actual collisions between American football players from Japanese universities. The subjects of this study were 23 players who belonged to T university in the Kantoh Collegiate American Football Association Division 2. We used a Vector Mouthguard (i1 Biometrics Inc.) equipped with 6 degrees of freedom (DOF) to measure the head linear acceleration (LA) and rotational acceleration (RA) as well as the head injury criterion (HIC), impact location, and number of impacts during collisions. The average number of collisions per player during a practice and during a game was 14.3 and 15.7, respectively. In terms of positions, the ratio (1:1.3) of total number of impacts for backs to linemen in Japan is lower than that (1:3) in the USA. Both during the games and practices, the range of 10 g < X ≤ 15 g in the average peak LA values was the most frequent, and the distributions were largely skewed toward low values (p < 0.05). The medians during the games and practices were 16.77 g and 15.87 g, respectively. The number of collisions during practices in Japan was significantly higher than that in the USA. Particularly, linemen undergo more head collisions than those of backs. Another common factor is that the impact of head collision during a game is significantly higher than that during a practice. However, data on Japanese university players is limited, and further data collection should be done before determining an accurate estimate of the practical concussion risk threshold.

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“…He further played on the offensive line, a position that suffers the most frontal impacts of all positions in the sport. 97 He retired after several years in the NFL, having also played for 5 years at a major Division I university. A conservative estimate, based indirectly on accelerometer studies, is that he suffered as many as 10 000 head impacts exceeding 10 times g, over the course of just his collegiate and professional careers.…”

Section: Neurodegenerative Disease Risk With Athletic Exposurementioning

confidence: 99%

Chronic traumatic encephalopathy: A paradigm in search of evidence?

Castellani

2015

Laboratory Investigation

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Chronic traumatic encephalopathy (CTE) has been in the medical literature since the 1920s. It is characterized clinically by diverse neuropsychiatric symptoms, and pathologically by variable degrees of phosphorylated tau accumulation in the brain. The evolving paradigm for the pathogenesis of CTE suggests that concussion or subconcussion from athletic participation initiates a cascade of pathologic events, encompassing neuroinflammation and protein templating with trans-synaptic neurotoxicity. The end result is neurologic and neurobehavioral deterioration, often with self-harm. Although these concepts warrant further investigation, the available evidence permits no conclusions as regards the pathogenesis of the reported findings. Investigations into the role of premorbid or co-morbid neurodegenerative diseases has been limited to date, and in-depth genetic analyses have not been performed. The role of concussion or subconcussion if any, whether and how the condition progresses over time, the extent of phosphorylated tau in clinically normal athletes, the role of phosphorylated tau as a toxic species versus an inert disease response, and whether protein templating has any in vivo relevance remain to be elucidated.

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Head impact exposure in collegiate football players

Cited by 233 publications

References 24 publications

Head-Impact–Measurement Devices: A Systematic Review

Head-Impact–Measurement Devices: A Systematic Review

Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration -

Chronic traumatic encephalopathy: A paradigm in search of evidence?

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