Head Impact Exposure in Youth Football: Elementary School Ages 9-12 Years and the Effect of Practice Structure
Head Impact Exposure in Youth Football: Elementary School Ages 9-12 Years and the Effect of Practice Structure
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DOI：
10.1007/s10439-013-0867-6
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发表时间：
2013-12-01
影响因子：
3.8
通讯作者：
Stitzel, Joel D.
中科院分区：
文献类型：
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作者：
Cobb, Bryan R.;Urban, Jillian E.;Stitzel, Joel D.
尽管14岁以下的儿童占美国所有足球运动员的70%，但青少年足球中头部撞击暴露的情况还没有得到很好的记录。这项研究的目的是量化9-12岁青少年足球运动员在单赛季所有练习和比赛中头部撞击的暴露情况。共有三支球队的50名球员(年龄=11.0+/-1.1岁)配备了头盔加速计阵列，该阵列监测球员在练习和比赛中遭受的每一次冲击。在本赛季，这个年龄段记录了11,978次撞击。球员在本赛季平均有240+/-A147次撞击，线性和旋转第95个百分位数分别为43+/-A7g和2034+/-A361rad/S(2)。总体而言，练习和游戏涉及的影响频率和程度相似。然而，由于共同努力限制练习中的接触，三个团队中的一个在每次练习中产生的影响要小得多，而且练习中的第95个百分位数也较低。同一支球队参加的练习也更少，进一步减少了每个球员在练习中经历的影响数量。在游戏中头部撞击暴露没有统计学差异。虽然9-12岁球员的加速幅度往往低于年长球员的报告，但一些记录的高幅度影响类似于高中和大学水平。通过限制练习中的接触，青少年足球中的头部碰撞暴露可能会明显减少。需要进一步的研究来评估这种头部撞击暴露的减少是否会导致脑震荡发生率的减少。
Head impact exposure in youth football has not been well-documented, despite children under the age of 14 accounting for 70% of all football players in the United States. The objective of this study was to quantify the head impact exposure of youth football players, age 9-12, for all practices and games over the course of single season. A total of 50 players (age = 11.0 +/- A 1.1 years) on three teams were equipped with helmet mounted accelerometer arrays, which monitored each impact players sustained during practices and games. During the season, 11,978 impacts were recorded for this age group. Players averaged 240 +/- A 147 impacts for the season with linear and rotational 95th percentile magnitudes of 43 +/- A 7 g and 2034 +/- A 361 rad/s(2). Overall, practice and game sessions involved similar impact frequencies and magnitudes. One of the three teams however, had substantially fewer impacts per practice and lower 95th percentile magnitudes in practices due to a concerted effort to limit contact in practices. The same team also participated in fewer practices, further reducing the number of impacts each player experienced in practice. Head impact exposures in games showed no statistical difference. While the acceleration magnitudes among 9-12 year old players tended to be lower than those reported for older players, some recorded high magnitude impacts were similar to those seen at the high school and college level. Head impact exposure in youth football may be appreciably reduced by limiting contact in practices. Further research is required to assess whether such a reduction in head impact exposure will result in a reduction in concussion incidence.