Powers Kaley C, Pfaff Lana M, Cinelli Michael E
Department of Kinesiology & Physical Education, Wilfrid Laurier University, Waterloo, ON, Canada.
Department of Kinesiology & Physical Education, Wilfrid Laurier University, Waterloo, ON, Canada.
J Biomech. 2021 Nov 9;128:110776. doi: 10.1016/j.jbiomech.2021.110776. Epub 2021 Sep 27.
Successful collision avoidance requires individuals to use readily available perceptual information to make decisions and act within their action capabilities. Female varsity rugby players use time-to-collision information to get closer to an obstacle before deviating; however, following a sport-related concussion (SRC), individuals may not be able to use the same strategies due to poorer action boundary perception. The current study examined the effects of a SRC on collision avoidance with an approaching person.
Non-concussed female varsity rugby athletes (ATH, n = 10) and recently concussed but asymptomatic teammates (CONC, n = 3) were instructed to walk at a comfortable pace and avoid colliding with an approaching confederate. Time-to-collision (TTC), rate of medial-lateral (ML) avoidance, and ML spatial requirement were calculated and analyzed using mixed repeated measures ANOVAs.
There were no physical characteristic differences between groups (p < 0.05) and no collisions occurred on any of the trials. However, CONC displayed larger TTC than ATH (p = 0.03), indicative of a more cautious avoidance strategy.
While rugby players are trained to avoid opponents, a more cautious strategy following a SRC may reflect visuomotor detraining and changes in embodiment. This suggests that despite being asymptomatic, there is a reduced sense of agency during dynamic perception-action tasks and persistent alterations between pre-concussion and post-concussion self.
成功的碰撞避免要求个体利用现成的感知信息来做出决策并在其行动能力范围内采取行动。女子大学橄榄球运动员在偏离前会利用碰撞时间信息靠近障碍物；然而，在发生与运动相关的脑震荡（SRC）后，由于行动边界感知较差，个体可能无法使用相同的策略。本研究考察了SRC对与接近的人避免碰撞的影响。
指导未受过脑震荡的女子大学橄榄球运动员（ATH，n = 10）和近期受过脑震荡但无症状的队友（CONC，n = 3）以舒适的步伐行走，并避免与接近的同谋者碰撞。计算并使用混合重复测量方差分析来分析碰撞时间（TTC）、内侧-外侧（ML）避免率和ML空间需求。
两组之间在身体特征上没有差异（p < 0.05），并且在任何试验中都没有发生碰撞。然而，CONC组的TTC比ATH组更大（p = 0.03），这表明其采用了更谨慎的避免策略。
虽然橄榄球运动员接受过避免与对手碰撞的训练，但在发生SRC后采取更谨慎的策略可能反映了视觉运动训练不足和身体表现的变化。这表明，尽管无症状，但在动态感知-行动任务中行动意识有所降低，并且在脑震荡前和脑震荡后的自我之间存在持续的变化。
