Kawata, K; Rubin, L H; Lee, J H; Sim, T; Takahagi, M; Szwanki, V; Bellamy, A; Darvish, K; Assari, S; Henderer, J D; Tierney, R; Langford, D
Association of football subconcussive head impacts with ocular near point of convergence Journal Article
In: JAMA Ophthalmology, vol. 134, no. 7, pp. 763–769, 2016.
Abstract | Links | BibTeX | Tags: Acceleration, accelerometer, adult, Article, binocular convergence, Concussion, eye movement, follow up, football, head movement, human, KINEMATICS, major clinical study, Male, mouth protector, observational study, priority journal, prospective study, traumatic brain injury, Young Adult
@article{Kawata2016,
title = {Association of football subconcussive head impacts with ocular near point of convergence},
author = {Kawata, K and Rubin, L H and Lee, J H and Sim, T and Takahagi, M and Szwanki, V and Bellamy, A and Darvish, K and Assari, S and Henderer, J D and Tierney, R and Langford, D},
doi = {10.1001/jamaophthalmol.2016.1085},
year = {2016},
date = {2016-01-01},
journal = {JAMA Ophthalmology},
volume = {134},
number = {7},
pages = {763--769},
abstract = {IMPORTANCE An increased understanding of the relationship between subconcussive head impacts and near point of convergence (NPC) ocular-motor function may be useful in delineating traumatic brain injury. OBJECTIVE To investigate whether repetitive subconcussive head impacts during preseason football practice cause changes in NPC. DESIGN, SETTING, AND PARTICIPANTS This prospective, observational study of 29 National Collegiate Athletic Association Division I football players included baseline and preseason practices (1 noncontact and 4 contact), and postseason follow-up and outcome measures were obtained for each time. An accelerometer-embedded mouthguard measured head impact kinematics. Based on the sum of head impacts from all 5 practices, players were categorized into lower (n = 7) or higher (n = 22) impact groups. EXPOSURES Players participated in regular practices, and all head impacts greater than 10g from the 5 practices were recorded using the i1Biometerics Vector mouthguard (i1 Biometrics Inc). MAIN OUTCOMES AND MEASURES Near point of convergence measures and symptom scores. RESULTS A total of 1193 head impacts were recorded from 5 training camp practices in the 29 collegiate football players; 22 were categorized into the higher-impact group and 7 into the lower-impact group. Therewere significant differences in head impact kinematics between lower- and higher-impact groups (number of impacts, 6 vs 41 [lower impact minus higher impact = 35; 95%CI, 21-51; P \< .001]; linear acceleration, 99g vs 1112g [lower impact minus higher impact= 1013; 95%CI, 621 - 1578; P \< .001]; angular acceleration, 7589 radian/s2 vs 65016 radian/s2 [lower impact minus higher impact= 57 427; 95%CI , 31 123-80 498; P \< .001], respectively). The trajectory and cumulative burden of subconcussive impacts on NPC differed by group (F for group × linear trend1},
keywords = {Acceleration, accelerometer, adult, Article, binocular convergence, Concussion, eye movement, follow up, football, head movement, human, KINEMATICS, major clinical study, Male, mouth protector, observational study, priority journal, prospective study, traumatic brain injury, Young Adult},
pubstate = {published},
tppubtype = {article}
}
Kawata, K; Rubin, L H; Lee, J H; Sim, T; Takahagi, M; Szwanki, V; Bellamy, A; Darvish, K; Assari, S; Henderer, J D; Tierney, R; Langford, D
Association of football subconcussive head impacts with ocular near point of convergence Journal Article
In: JAMA Ophthalmology, vol. 134, no. 7, pp. 763–769, 2016.
@article{Kawata2016,
title = {Association of football subconcussive head impacts with ocular near point of convergence},
author = {Kawata, K and Rubin, L H and Lee, J H and Sim, T and Takahagi, M and Szwanki, V and Bellamy, A and Darvish, K and Assari, S and Henderer, J D and Tierney, R and Langford, D},
doi = {10.1001/jamaophthalmol.2016.1085},
year = {2016},
date = {2016-01-01},
journal = {JAMA Ophthalmology},
volume = {134},
number = {7},
pages = {763--769},
abstract = {IMPORTANCE An increased understanding of the relationship between subconcussive head impacts and near point of convergence (NPC) ocular-motor function may be useful in delineating traumatic brain injury. OBJECTIVE To investigate whether repetitive subconcussive head impacts during preseason football practice cause changes in NPC. DESIGN, SETTING, AND PARTICIPANTS This prospective, observational study of 29 National Collegiate Athletic Association Division I football players included baseline and preseason practices (1 noncontact and 4 contact), and postseason follow-up and outcome measures were obtained for each time. An accelerometer-embedded mouthguard measured head impact kinematics. Based on the sum of head impacts from all 5 practices, players were categorized into lower (n = 7) or higher (n = 22) impact groups. EXPOSURES Players participated in regular practices, and all head impacts greater than 10g from the 5 practices were recorded using the i1Biometerics Vector mouthguard (i1 Biometrics Inc). MAIN OUTCOMES AND MEASURES Near point of convergence measures and symptom scores. RESULTS A total of 1193 head impacts were recorded from 5 training camp practices in the 29 collegiate football players; 22 were categorized into the higher-impact group and 7 into the lower-impact group. Therewere significant differences in head impact kinematics between lower- and higher-impact groups (number of impacts, 6 vs 41 [lower impact minus higher impact = 35; 95%CI, 21-51; P \< .001]; linear acceleration, 99g vs 1112g [lower impact minus higher impact= 1013; 95%CI, 621 - 1578; P \< .001]; angular acceleration, 7589 radian/s2 vs 65016 radian/s2 [lower impact minus higher impact= 57 427; 95%CI , 31 123-80 498; P \< .001], respectively). The trajectory and cumulative burden of subconcussive impacts on NPC differed by group (F for group × linear trend1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kawata, K; Rubin, L H; Lee, J H; Sim, T; Takahagi, M; Szwanki, V; Bellamy, A; Darvish, K; Assari, S; Henderer, J D; Tierney, R; Langford, D
Association of football subconcussive head impacts with ocular near point of convergence Journal Article
In: JAMA Ophthalmology, vol. 134, no. 7, pp. 763–769, 2016.
Abstract | Links | BibTeX | Tags: Acceleration, accelerometer, adult, Article, binocular convergence, Concussion, eye movement, follow up, football, head movement, human, KINEMATICS, major clinical study, Male, mouth protector, observational study, priority journal, prospective study, traumatic brain injury, Young Adult
@article{Kawata2016,
title = {Association of football subconcussive head impacts with ocular near point of convergence},
author = {Kawata, K and Rubin, L H and Lee, J H and Sim, T and Takahagi, M and Szwanki, V and Bellamy, A and Darvish, K and Assari, S and Henderer, J D and Tierney, R and Langford, D},
doi = {10.1001/jamaophthalmol.2016.1085},
year = {2016},
date = {2016-01-01},
journal = {JAMA Ophthalmology},
volume = {134},
number = {7},
pages = {763--769},
abstract = {IMPORTANCE An increased understanding of the relationship between subconcussive head impacts and near point of convergence (NPC) ocular-motor function may be useful in delineating traumatic brain injury. OBJECTIVE To investigate whether repetitive subconcussive head impacts during preseason football practice cause changes in NPC. DESIGN, SETTING, AND PARTICIPANTS This prospective, observational study of 29 National Collegiate Athletic Association Division I football players included baseline and preseason practices (1 noncontact and 4 contact), and postseason follow-up and outcome measures were obtained for each time. An accelerometer-embedded mouthguard measured head impact kinematics. Based on the sum of head impacts from all 5 practices, players were categorized into lower (n = 7) or higher (n = 22) impact groups. EXPOSURES Players participated in regular practices, and all head impacts greater than 10g from the 5 practices were recorded using the i1Biometerics Vector mouthguard (i1 Biometrics Inc). MAIN OUTCOMES AND MEASURES Near point of convergence measures and symptom scores. RESULTS A total of 1193 head impacts were recorded from 5 training camp practices in the 29 collegiate football players; 22 were categorized into the higher-impact group and 7 into the lower-impact group. Therewere significant differences in head impact kinematics between lower- and higher-impact groups (number of impacts, 6 vs 41 [lower impact minus higher impact = 35; 95%CI, 21-51; P \< .001]; linear acceleration, 99g vs 1112g [lower impact minus higher impact= 1013; 95%CI, 621 - 1578; P \< .001]; angular acceleration, 7589 radian/s2 vs 65016 radian/s2 [lower impact minus higher impact= 57 427; 95%CI , 31 123-80 498; P \< .001], respectively). The trajectory and cumulative burden of subconcussive impacts on NPC differed by group (F for group × linear trend1},
keywords = {Acceleration, accelerometer, adult, Article, binocular convergence, Concussion, eye movement, follow up, football, head movement, human, KINEMATICS, major clinical study, Male, mouth protector, observational study, priority journal, prospective study, traumatic brain injury, Young Adult},
pubstate = {published},
tppubtype = {article}
}