背景:头盔填充物的口袋效应有助于消散头部承受的力,但是如果玩家的头盔在对手的垫肩中保持静止,颈椎上的压缩力可能会增加。
目的:(1)测量不同足球头盔饰面和足球球衣织物之间的静摩擦系数,(2)计算由于存在的摩擦量而对运动员头盔施加的潜在力。
方法:横断面研究。
方法:实验室。
方法:头盔具有不同的饰面和不同的足球球衣面料。
方法:确定了2个头盔样品(光泽和哑光)的摩擦系数,3件足球球衣(大学,高中,和青春),和3种类型的球衣号码(丝网印刷,升华,并缝合)使用TAPPIT815标准方法。这些测量确定了哪个头盔到头盔,头盔到球衣的号码,和头盔到球衣的材料组合产生了最小的静摩擦量。
结果:光泽头盔与光泽头盔组合相比,其他2个头盔组合产生了更大的静摩擦量(P=.013)。光泽头盔与大学球衣组合比其他头盔与球衣材料组合产生更大的静摩擦(P<0.01)。光泽头盔与丝印数字组合比其他头盔与球衣数字组合产生了更大的静摩擦量(P<.01)。
结论:碰撞过程中经历的静摩擦力可能与临床相关。具有较高静摩擦系数的条件导致较大的力。在这项研究中,与其他头盔到球衣组合相比,最高的摩擦系数(光滑头盔与丝印数量)可以使玩家头盔上的力增加3553.88N。我们的结果表明,头盔和统一材料的化妆可能会影响运动安全性。
BACKGROUND: The pocketing effect of helmet padding helps to dissipate forces experienced by the head, but if the player\'s helmet remains stationary in an opponent\'s shoulder pads, the compressive force on the cervical spine may increase.
OBJECTIVE: To (1) measure the coefficient of static friction between different football helmet finishes and football jersey fabrics and (2) calculate the potential amount of force on a player\'s helmet due to the amount of friction present.
METHODS: Cross-sectional study.
METHODS: Laboratory.
METHODS: Helmets with different finishes and different football jersey fabrics.
METHODS: The coefficient of friction was determined for 2 helmet samples (glossy and matte), 3 football jerseys (collegiate, high school, and youth), and 3 types of jersey numbers (silkscreened, sublimated, and stitched on) using the TAPPI T 815 standard method. These measurements determined which helmet-to-helmet, helmet-to-jersey number, and helmet-to-jersey material combination resulted in the least amount of static friction.
RESULTS: The glossy helmet versus glossy helmet combination produced a greater amount of static friction than the other 2 helmet combinations (P = .013). The glossy helmet versus collegiate jersey combination produced a greater amount of static friction than the other helmet-to-jersey material combinations (P < .01). The glossy helmet versus silkscreened numbers combination produced a greater amount of static friction than the other helmet-to-jersey number combinations (P < .01).
CONCLUSIONS: The force of static friction experienced during collisions can be clinically relevant. Conditions with higher coefficients of static friction result in greater forces. In this study, the highest coefficient of friction (glossy helmet versus silkscreened number) could increase the forces on the player\'s helmet by 3553.88 N when compared with other helmet-to-jersey combinations. Our results indicate that the makeup of helmet and uniform materials may affect sport safety.