School of Rehabilitation Sciences, Old Dominion University, 4211 Monarch Way, Suite 275, Norfolk, VA, USA.
Exp Brain Res. 2020 Dec;238(12):2783-2793. doi: 10.1007/s00221-020-05934-4. Epub 2020 Sep 30.
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.
姿势稳定性缺陷在脑震荡病例中很常见。然而，脑震荡后站立姿势稳定性受损持续的客观时间通常没有定论。本研究旨在确定既往脑震荡史是否与姿势稳定性缺陷有关，超出临床恢复的判断。假设脑震荡病史与静态稳定性下降有关，与从未遭受脑震荡的个体相比。根据是否报告有一次或多次既往脑震荡（n=27）或无脑震荡史（n=27），招募了 54 名健康成年人。参与者被指示站在力台上，在 30 秒内根据姿势和任务数量在四个条件下（1）双足，单任务，（2）双足，双任务，（3）单足，单任务和（4）单足，双任务下跟踪中心压力（CoP）。结果表明，有脑震荡史的个体在双任务条件下表现出明显的姿势稳定性降低，表现为姿势摆动的平均位移和椭圆面积增加，以及 CoP 样本熵降低。然而，在单任务条件下，两组之间的 CoP 位移或椭圆面积没有显著差异。总体而言，这些发现表明，脑震荡与站立姿势稳定性维持受损有关，这种受损在初始损伤的临床缓解后大约 7 年仍然明显。在双任务条件下这些损伤的加剧表明，脑震荡可能导致分配适当注意力资源以应对多个并发目标的能力降低。
