Decoster Laura C, Shirley Chandra P, Swartz Erik E
New Hampshire Musculoskeletal Institute, Manchester, NH 03101, USA.
J Athl Train. 2005 Jul-Sep;40(3):169-73.
The Inter-Association Task Force for the Appropriate Care of the Spine-Injured Athlete recommends leaving a football player's helmet in place and removing the face mask from the helmet "as quickly as possible and with as little movement of the head and neck as possible." Although 2 groups have studied face-mask removal from new equipment, to our knowledge no researchers have investigated equipment that has been previously used. A full season of play may have a significant effect on football equipment and its associated hardware. Countless impacts, weather, playing surfaces, sweat, and other unforeseen or unknown variables might make the face-mask removal process more difficult on equipment that has been used.
To determine the percentage of face masks that we could unscrew, with a cordless screwdriver, from football helmets used for a full season.
Cross-sectional.
Three New England high schools.
All football helmets used at 3 local high schools were tested (n = 222, mean games, 9.7 +/- 1.2; mean practice weeks, 13.7 +/- 1.2).
INTERVENTION(S): Each helmet was secured to a board, and a cordless screwdriver was used to attempt to remove all 4 screws attaching the face mask to the helmet.
MAIN OUTCOME MEASURE(S): Variables included overall success or failure, time required for face-mask removal, and success by screw location. Data were analyzed with chi2, analysis of variance, and Tamhane post hoc tests.
Overall, 832 (94%) of 885 screws were unscrewed, and 183 (82.4%) of 222 face masks were removed. Mean removal time was 26.9 +/- 5.83 seconds. Face-mask removal success was significantly different between school 1 (24 [52.2%] of 46) and schools 2 (84 [91.3%] of 92) and 3 (75 [89.3%] of 84; F(2,219) = 24.608; P < .001). The removal success rate was significantly higher at top screws (98%) than at screws adjacent to ear holes (90%) (P < .001).
Based on our results and previous findings that demonstrated quicker access time and reduced head movement associated with the use of the screwdriver compared with cutting tools, the former may be a good tool for face-mask removal. However, an appropriate cutting tool must be immediately available should the screwdriver fail. Helmet hardware adjacent to ear holes was more vulnerable to failure, perhaps because it is protected by less padding than the top hardware. Possible causes of the higher failure rate at school 1 are the use of hardware materials subject to rust and corrosion and differences in helmet brand; these areas warrant future research and rules consideration.
脊柱损伤运动员合理护理跨协会特别工作组建议,让橄榄球运动员的头盔保持原位,并“尽快且尽量减少头部和颈部的移动”从头盔上移除面罩。尽管有两个小组研究了从新设备上移除面罩的情况,但据我们所知,尚无研究人员对先前使用过的设备进行调查。一整个赛季的比赛可能会对橄榄球设备及其相关硬件产生重大影响。无数次撞击、天气、比赛场地、汗水以及其他不可预见或未知的变量,可能会使在已使用过的设备上移除面罩的过程更加困难。
确定使用无绳螺丝刀从使用了一整个赛季的橄榄球头盔上拧下的面罩的百分比。
横断面研究。
新英格兰的三所高中。
对当地三所高中使用的所有橄榄球头盔进行了测试(n = 222,平均比赛场次9.7 ± 1.2;平均训练周数13.7 ± 1.2)。
将每个头盔固定在一块板上,并用无绳螺丝刀试图拧下将面罩固定在头盔上的所有4颗螺丝。
变量包括总体成功或失败、移除面罩所需时间以及按螺丝位置划分的成功率。数据采用卡方检验、方差分析和Tamhane事后检验进行分析。
总体而言,885颗螺丝中有832颗(94%)被拧下,222个面罩中有183个(82.4%)被移除。平均移除时间为26.9 ± 5.83秒。学校1(46个中有24个[52.2%])与学校2(92个中有84个[91.3%])和学校3(84个中有75个[89.3%])之间面罩移除成功率存在显著差异(F(2,219) = 24.608;P < .001)。顶部螺丝的移除成功率(98%)显著高于靠近耳孔的螺丝(90%)(P < .001)。
基于我们的研究结果以及先前的研究发现,与切割工具相比,使用螺丝刀移除面罩的进入时间更快且头部移动减少,因此螺丝刀可能是移除面罩的良好工具。然而,如果螺丝刀出现故障,必须立即提供合适的切割工具。靠近耳孔的头盔硬件更容易出现故障,可能是因为它比顶部硬件受到的衬垫保护更少。学校1失败率较高的可能原因是使用了易生锈和腐蚀的硬件材料以及头盔品牌的差异;这些领域值得未来进行研究并考虑制定相关规则。