Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration -
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 Mo...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Japanese Society of Physical Fitness and Sports Medicine
2017-07-01
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| Series: | Journal of Physical Fitness and Sports Medicine |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jpfsm/6/4/6_241/_pdf/-char/en |
| _version_ | 1818645224521465856 |
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| author | Takashi Fukuda Sekiya Koike Syumpei Miyakawa Hiroto Fujiya Yuki Yamamoto |
| author_facet | Takashi Fukuda Sekiya Koike Syumpei Miyakawa Hiroto Fujiya Yuki Yamamoto |
| author_sort | Takashi Fukuda |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-17T00:27:21Z |
| format | Article |
| id | doaj.art-b1742a0b1bc94adeaf8d96cc5818d5eb |
| institution | Directory Open Access Journal |
| issn | 2186-8131 2186-8123 |
| language | English |
| last_indexed | 2024-12-17T00:27:21Z |
| publishDate | 2017-07-01 |
| publisher | Japanese Society of Physical Fitness and Sports Medicine |
| record_format | Article |
| series | Journal of Physical Fitness and Sports Medicine |
| spelling | doaj.art-b1742a0b1bc94adeaf8d96cc5818d5eb2022-12-21T22:10:25ZengJapanese Society of Physical Fitness and Sports MedicineJournal of Physical Fitness and Sports Medicine2186-81312186-81232017-07-016424124910.7600/jpfsm.6.241jpfsmImpact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration -Takashi Fukuda0Sekiya Koike1Syumpei Miyakawa2Hiroto Fujiya3Yuki Yamamoto4Faculty of Sport and Health Science, University of TsukubaFaculty of Sport and Health Science, University of TsukubaFaculty of Sport and Health Science, University of TsukubaDepartment of Sports Medicine, St. Marianna University School of MedicineUniversity of Tsukuba Sports Research & Development CoreThe 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.https://www.jstage.jst.go.jp/article/jpfsm/6/4/6_241/_pdf/-char/enamerican footballhead impactnumber of head impactslinear head accelerationconcussion |
| spellingShingle | Takashi Fukuda Sekiya Koike Syumpei Miyakawa Hiroto Fujiya Yuki Yamamoto Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration - Journal of Physical Fitness and Sports Medicine american football head impact number of head impacts linear head acceleration concussion |
| title | Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration - |
| title_full | Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration - |
| title_fullStr | Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration - |
| title_full_unstemmed | Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration - |
| title_short | Impact on the head during collisions between university American football players - focusing on the number of head impacts and linear head acceleration - |
| title_sort | impact on the head during collisions between university american football players focusing on the number of head impacts and linear head acceleration |
| topic | american football head impact number of head impacts linear head acceleration concussion |
| url | https://www.jstage.jst.go.jp/article/jpfsm/6/4/6_241/_pdf/-char/en |
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