Int J Sports Physiol Perform. 2022 Jun 1;17(6):834-843. doi: 10.1123/ijspp.2021-0258. Epub 2022 Feb 25.
To describe the Dynamic Exertion Test (EXiT) by comparing physiological, performance, and clinical outcomes between athletes medically cleared following sport-related concussion (SRC) and healthy controls.
One hundred four (female = 41, 39.4%) participants (14-21 y of age) including 52 medically cleared for return to play at 21.48 (15.40) days following SRC and 52 healthy athletes completed the EXiT involving (1) 12-minute aerobic component and (2) 18-minute dynamic component including 2 functional movement and 5 change-of-direction (COD) tasks. Physiological (heart rate and blood pressure), clinical (endorsed symptoms and rating of perceived exertion), and performance (COD-task completion time and errors) outcomes were collected throughout EXiT. Participants also completed the Postconcussion Symptom Scale and vestibular/ocular motor screening before EXiT. Independent-samples t tests were used to compare groups on resting heart rate and blood pressure, COD-task completion time, and Mann-Whitney U tests on Postconcussion Symptom Scale, vestibular/ocular motor screening, and EXiT symptoms, rating of perceived exertion, and errors.
COD-task completion time and resting systolic blood pressure and heart rate were similar between groups (P > .05). SRC reported greater rating of perceived exertion during the aerobic component (P < .05) and lower total dizziness (P = .003) and total symptoms (P = .021) during EXiT and had lower near point of convergence distance (P < .001) and total symptoms (P = .007) for vestibular/ocular motor screening than healthy athletes.
Physiological, performance, and clinical EXiT outcomes were equivocal between athletes at medical clearance following SRC and healthy controls. The multidomain EXiT may help to inform safe return-to-play decision making post-SRC.
通过比较运动相关脑震荡（SRC）后接受医学检查并获准重返运动的运动员和健康对照组的生理、表现和临床结果，来描述动态用力测试（EXiT）。
共有 104 名参与者（女性=41 名，占 39.4%）（年龄 14-21 岁）完成了 EXiT，包括 52 名 SRC 后第 21.48（15.40）天获准重返运动的运动员和 52 名健康运动员。EXiT 包括（1）12 分钟的有氧运动部分和（2）18 分钟的动态部分，包括 2 项功能性运动和 5 项变向（COD）任务。在 EXiT 过程中收集了生理（心率和血压）、临床（症状和感知用力等级）和表现（COD 任务完成时间和错误）结果。参与者还在 EXiT 之前完成了脑震荡后症状量表和前庭/眼动筛查。使用独立样本 t 检验比较两组的静息心率和血压、COD 任务完成时间，以及使用曼-惠特尼 U 检验比较脑震荡后症状量表、前庭/眼动筛查、EXiT 症状、感知用力等级和错误。
两组间 COD 任务完成时间和静息收缩压和心率相似（P >.05）。SRC 报告在有氧运动部分的感知用力等级更高（P <.05），在 EXiT 期间的总头晕（P =.003）和总症状（P =.021）更低，以及近点集合距离（P <.001）和前庭/眼动筛查的总症状（P =.007）更低。
在接受医学检查并获准重返运动的 SRC 后运动员和健康对照组之间，EXiT 的生理、表现和临床结果没有差异。多维 EXiT 可能有助于为 SRC 后安全重返运动做出决策。
