Postural stability deficits are commonly observed in cases of concussion. However, the objective duration in which impairments of standing postural stability remain following a concussion is often inconclusive. The present study was conducted to determine if prior history of concussion is associated with deficits in postural stability beyond the clinical determination of recovery. It was hypothesized that concussion history would be associated with decreases in static stability compared to individuals that have never sustained a concussion. Fifty-four healthy adults were recruited based on whether they reported sustaining one or more prior concussions (n = 27) or no history of concussion (n = 27). Participants were instructed to stand on a force platform to track center-of-pressure (CoP) during standing for thirty seconds under four conditions based on stance and number of tasks: (1) bipedal, single-task, (2) bipedal, dual-task, (3) unipedal, single-task, and (4) unipedal, dual-task. Results revealed that individuals with a history of concussion demonstrate significantly reduced postural stability under dual-task conditions as evidenced by increases in average displacements and elliptical area of postural sway as well as reductions in CoP sample entropy. However, there were no significant differences in CoP displacement or elliptical area between groups under single task conditions. Overall, these findings indicate that concussion is associated with impairments of maintaining standing postural stability that remain evident approximately 7 years following clinical resolution of the initial injury. The exacerbation of these impairments under dual-task conditions indicate that concussion can result in a reduced capacity to allocate proper attention resources to multiple concurrent objectives.

通常在脑震荡中观察到姿势稳定性不足。然而，脑震荡后保持站立姿势稳定性受损的客观持续时间通常是不确定的。进行本研究是为了确定脑震荡的既往史是否与超出临床恢复水平的姿势稳定性不足有关。据推测，与从未经历过脑震荡的个体相比，脑震荡史将与静态稳定性的下降有关。根据是否报告维持一次或多次先前脑震荡（n  = 27）或无脑震荡史（n = 27）。指示参与者根据姿势和任务数量在四种条件下站立时在30秒钟内站立在压力平台（CoP）上的压力中心（CoP）：( 1）双足，单任务，（2）双足，双任务，（3）单步，单任务和（4）单步，双任务。结果表明，有脑震荡史的人在双重任务条件下表现出明显的姿势稳定性下降，这由姿势位移的平均位移和椭圆面积的增加以及CoP样本熵的减小所证明。但是，在单个任务条件下，组之间的CoP位移或椭圆面积没有显着差异。总体，这些发现表明脑震荡与保持站立姿势稳定性的损害有关，这种损害在临床初步损伤缓解后约7年仍很明显。在双重任务条件下，这些障碍的加剧表明，脑震荡会导致将适当的注意力资源分配给多个并发目标的能力降低。