There is a growing body of literature informing efforts to improve the safety of football; however, research relating on-field activity to head impacts in youth football is limited. Therefore, the objective of this study was to compare head impact exposure (HIE) measured in game plays among 3 youth football teams.
Head impact and video data were collected from athletes (ages 10–13 years) participating on 3 youth football teams. Video analysis was performed to verify head impacts and assign each to a specific play type. Each play was categorized as a down, punt, kickoff, field goal, or false start. Kickoffs and punts were classified as special teams. Downs were classified as running, passing, or other. HIE was quantified by play type in terms of mean, median, and 95th percentile linear and rotational acceleration. Mixed-effects models were used to assess differences in acceleration among play types. Contact occurring on special teams plays was evaluated using a standardized video abstraction form.
A total of 3003 head impacts over 27.5 games were analyzed and paired with detailed video coding of plays. Most head impacts were attributed to running (79.6%), followed by passing (14.0%), and special teams (6.4%) plays. The 95th percentile linear acceleration measured during each play type was 52.6g, 50.7g, and 65.5g, respectively. Special teams had significantly greater mean linear acceleration than running and passing plays (both p = 0.03). The most common kick result on special teams was a deep kick, of which 85% were attempted to be returned. No special teams plays resulted in a touchback, and one resulted in a fair catch. One-third of all special teams plays and 92% of all nonreturned kicks resulted in athletes diving toward the ball.
The results demonstrate a trend toward higher head impact magnitudes on special teams than for running and passing plays, but a greater number of impacts were measured during running plays. Deep kicks were most common on special teams, and many returned and nonreturned kicks resulted in athletes diving toward the ball. These results support policy changes to youth special teams plays, including modifying the yard line the ball is kicked from and coaching proper return technique. Further investigation into biomechanical exposure measured during game impact scenarios is needed to inform policy relevant to the youth level.
ABBREVIATIONSAYF = American Youth Football; HIE = head impact exposure; HITS = Head Impact Telemetry System.
Correspondence Jillian E. Urban: Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences, Winston-Salem, NC. firstname.lastname@example.org.INCLUDE WHEN CITING Published online May 10, 2019; DOI: 10.3171/2019.2.PEDS18558.Disclosures The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.
AloscoML, TripodisY, JarnaginJ, BaughCM, MartinB, ChaissonCE, : Repetitive head impact exposure and later-life plasma total tau in former National Football League players. 7:33–40, 201628229128)| false
BahramiN, SharmaD, RosenthalS, DavenportEM, UrbanJE, WagnerB, : Subconcussive head impact exposure and white matter tract changes over a single season of youth football. 281:919–926, 201610.1148/radiol.2016160564)| false
BarnettLM, LaiSK, VeldmanSLC, HardyLL, CliffDP, MorganPJ, : Correlates of gross motor competence in children and adolescents: a systematic review and meta-analysis. 46:1663–1688, 20162689427410.1007/s40279-016-0495-z)| false
BeckwithJG, GreenwaldRM, ChuJJ: Measuring head kinematics in football: correlation between the head impact telemetry system and Hybrid III headform. 40:237–248, 201210.1007/s10439-011-0422-221994068)| false
BeckwithJG, GreenwaldRM, ChuJJ, CriscoJJ, RowsonS, DumaSM, : Head impact exposure sustained by football players on days of diagnosed concussion. 45:737–746, 201310.1249/MSS.0b013e3182792ed723135363)| false
CobbBR, UrbanJE, DavenportEM, RowsonS, DumaSM, MaldjianJA, : Head impact exposure in youth football: elementary school ages 9–12 years and the effect of practice structure. 41:2463–2473, 201310.1007/s10439-013-0867-623881111)| false
DavenportEMApkarianKWhitlowCTUrbanJEJensenJHSzuchE: Abnormalities in diffusional kurtosis metrics related to head impact exposure in a season of high school varsity football. J Neurotrauma33:2133–21462016
DavenportEM, ApkarianK, WhitlowCT, UrbanJE, JensenJH, SzuchE, : Abnormalities in diffusional kurtosis metrics related to head impact exposure in a season of high school varsity football. 33:2133–2146, 201610.1089/neu.2015.4267)| false
DavenportEM, WhitlowCT, UrbanJE, EspelandMA, JungY, RosenbaumDA, : Abnormal white matter integrity related to head impact exposure in a season of high school varsity football. 31:1617–1624, 201410.1089/neu.2013.3233)| false
HendricksSden HollanderSTamNBrownJLambertM: The relationships between rugby players’ tackle training attitudes and behaviour and their match tackle attitudes and behaviour. BMJ Open Sport Exerc Med1:e0000462015
HendricksS, den HollanderS, TamN, BrownJ, LambertM: The relationships between rugby players’ tackle training attitudes and behaviour and their match tackle attitudes and behaviour. 1:e000046, 201510.1136/bmjsem-2015-00004627900133)| false
HouckZ, AskenB, BauerR, PothastJ, MichaudetC, ClugstonJ: Epidemiology of sport-related concussion in an NCAA Division I Football Bowl Subdivision sample. 44:2269–2275, 201610.1177/0363546516645070)| false
KelleyME, EspelandMA, FloodWC, PowersAK, WhitlowCT, MaldjianJA, : Comparison of head impact exposure in practice drills among multiple youth football teams. 23:381–389, 201910.3171/2018.9.PEDS18314)| false
KerrZYDaltonSLRoosKGDjokoAPhelpsJDompierTP: Comparison of Indiana high school football injury rates by inclusion of the USA Football “Heads Up Football” player safety coach. Orthop J Sports Med4:23259671166484412016
KerrZY, DaltonSL, RoosKG, DjokoA, PhelpsJ, DompierTP: Comparison of Indiana high school football injury rates by inclusion of the USA Football “Heads Up Football” player safety coach. 4:2325967116648441, 20162727500010.1177/2325967116648441)| false
KerrZY, SimonJE, GroomsDR, RoosKG, CohenRP, DompierTP: Epidemiology of football injuries in the National Collegiate Athletic Association, 2004-2005 to 2008-2009. 4:2325967116664500, 20162763541210.1177/2325967116664500)| false
MontenigroPHAloscoMLMartinBMDaneshvarDHMezJChaissonCE: Cumulative head impact exposure predicts later-life depression, apathy, executive dysfunction, and cognitive impairment in former high school and college football players. J Neurotrauma34:328–3402017
MontenigroPH, AloscoML, MartinBM, DaneshvarDH, MezJ, ChaissonCE, : Cumulative head impact exposure predicts later-life depression, apathy, executive dysfunction, and cognitive impairment in former high school and college football players. 34:328–340, 201710.1089/neu.2016.441327029716)| false
OcwiejaKE, MihalikJP, MarshallSW, SchmidtJD, TrulockSC, GuskiewiczKM: The effect of play type and collision closing distance on head impact biomechanics. 40:90–96, 20122199406110.1007/s10439-011-0401-7)| false
PellmanEJ, PowellJW, VianoDC, CassonIR, TuckerAM, FeuerH, : Concussion in professional football: epidemiological features of game injuries and review of the literature—part 3. 54:81–96, 200410.1227/01.NEU.0000097267.54786.5414683544)| false
StammJM, BourlasAP, BaughCM, FrittsNG, DaneshvarDH, MartinBM, : Age of first exposure to football and later-life cognitive impairment in former NFL players. 84:1114–1120, 201510.1212/WNL.000000000000135825632088)| false
TaggeCAFisherAMMinaevaOVGaudreau-BalderramaAMoncasterJAZhangXL: Concussion, microvascular injury, and early tauopathy in young athletes after impact head injury and an impact concussion mouse model. Brain141:422–4582018
TaggeCA, FisherAM, MinaevaOV, Gaudreau-BalderramaA, MoncasterJA, ZhangXL, : Concussion, microvascular injury, and early tauopathy in young athletes after impact head injury and an impact concussion mouse model. 141:422–458, 201810.1093/brain/awx35029360998)| false
UrbanJE, DavenportEM, GolmanAJ, MaldjianJA, WhitlowCT, PowersAK, : Head impact exposure in youth football: high school ages 14 to 18 years and cumulative impact analysis. 41:2474–2487, 201310.1007/s10439-013-0861-z23864337)| false
VänttinenT, BlomqvistM, LuhtanenP, HäkkinenK: Effects of age and soccer expertise on general tests of perceptual and motor performance among adolescent soccer players. 110:675–692, 20102068132310.2466/pms.110.3.675-692)| false