University of Otago, School of Physical Education Sport and Exercise Sciences, New Zealand.
University of Otago, School of Physical Education Sport and Exercise Sciences, New Zealand.
Phys Ther Sport. 2019 May;37:105-112. doi: 10.1016/j.ptsp.2019.03.012. Epub 2019 Mar 23.
The objective of this study is to explore the effect of concussion history on head control during front on rugby tackles in non-professional male and female Rugby Union players.
An observational cross-sectional design.
A laboratory-based study of simulated front on rugby tackles with a dynamic relatively-weighted (∼50% body-mass) tackle bag.
27 club Rugby Union players were recruited; 10 (7female) with no-concussion history, 10 (3female) within 12-months of concussion and 7 (3female) with 24 + months since last concussion.
Linear and rotational head acceleration measured with a skin mounted CSx triaxial accelerometer. Normalized Surface EMG amplitude of the bilateral sternocleidomastoid (Scm), upper trapezius (Trap) and splenius capitis (Spl). All outcome measures were synchronised with moment of impact with the tackle bag.
A mixed-model analysis showed that players with 12-Month concussion history had the highest head acceleration (females = 48.6g, males = 68.3g, p < 0.05) with lower Trap (6.9-11.7%, p < 0.05) and Spl (3-12%, p < 0.05) amplitudes compared to athletes with No-concussion.
These findings suggest probable disruption to neuromuscular control of the head in athletes with concussion history as a potential mechanism for recurrent concussion incidence.
本研究旨在探讨脑震荡史对非职业男性和女性橄榄球联盟球员正面橄榄球铲球时头部控制的影响。
观察性横断面设计。
在实验室环境下，使用动态相对重量（约 50%体重）的橄榄球铲球模拟实验。
共招募了 27 名橄榄球俱乐部运动员，其中 10 名（7 名女性）无脑震荡史，10 名（3 名女性）在脑震荡后 12 个月内，7 名（3 名女性）在脑震荡后 24 个月以上。
使用皮肤安装的 CSx 三轴加速度计测量线性和旋转头部加速度。双侧胸锁乳突肌（Scm）、上斜方肌（Trap）和头夹肌（Spl）的表面肌电图幅度的归一化值。所有结果指标均与与铲球包撞击时同步。
混合模型分析表明，12 个月脑震荡史的运动员头部加速度最高（女性为 48.6g，男性为 68.3g，p<0.05），与无脑震荡运动员相比，Trap（6.9-11.7%，p<0.05）和 Spl（3-12%，p<0.05）的振幅较低。
这些发现表明，有脑震荡史的运动员可能存在头部神经肌肉控制的中断，这可能是反复脑震荡发生的潜在机制。
