Task-invariance and reliability of anticipatory postural adjustments in healthy young adults.
Task-invariance and reliability of anticipatory postural adjustments in healthy young adults.
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健康年轻人预期姿势调整的任务不变性和可靠性。
DOI：
10.1016/j.gaitpost.2020.01.003
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发表时间：
2020
期刊：
影响因子：
2.4
通讯作者：
Jacobs,JesseV
中科院分区：
文献类型：
--
作者：
Smith,JoArmour;Ignasiak,NiklasKönig;Jacobs,JesseV
研究背景在快速肢体运动等任务中，躯干会发生反摆动姿势调整(APA)，在肌肉骨骼和神经功能障碍的个体中，APA会受损。为了了解APA损伤，首先要确定APA是否可以可靠地测量，以及哪些APA特征是任务不变的。研究问题：在举臂和抬腿任务中，躯干APA的潜伏期、波幅和肌肉激活模式(协同效应)的重测信度是什么，这些APA特征在个人和群体水平上在多大程度上是不变的？方法15名年轻人(平均年龄23.7(±3.2)岁)进行了两次站立快速举臂任务和仰卧举腿任务的6次试验。测量竖脊肌和外/内斜肌中APA的潜伏期、波幅和共激活，并通过主成分分析确定APA的协同作用。用组内相关系数计算两次测试的重测信度。任务不变性在个体水平上进行相关检验，在团体水平上进行等价性检验。结果大多数变量具有可接受的重测信度。APA激活的协同作用和许多特征在不同的任务中有所不同，尽管在个体水平上，运动表现时间和腰椎竖起棘肌激活的幅度在不同任务中显著相关。平均运动前反应时、外斜视潜伏期、对侧斜视波幅和内斜视协同激活在不同任务间具有等效性。因此，必须在具有不同生物力学要求的多个任务中对APA进行评估，以充分研究导致运动功能障碍的机制。这项研究中的可靠性分析有助于解释群体差异或APA行为的变化，以响应对所选任务的干预。
BackgroundAnticipatory postural adjustments (APAs) occur in the trunk during tasks such as rapid limb movement and are impaired in individuals with musculoskeletal and neurological dysfunction. To understand APA impairment, it is important to first determine if APAs can be measured reliably and which characteristics of APAs are task-invariant.Research questionWhat is the test-retest reliability of latency, amplitude and muscle activation patterns (synergies) of trunk APAs during arm-raise and leg-raise tasks, and to what extent are these APA characteristics invariant across tasks at the individual and group levels?Methods15 young adults (mean age: 23.7 (±3.2) years) performed six trials of a rapid arm raise task in standing and a leg raise task in supine on two occasions. Latency, amplitude and coactivation of APAs in the erector spinae and external/internal oblique musculature were measured, and APA synergies were identified with principle components analysis. Test-retest reliability across the two sessions was calculated with intraclass correlation coefficients. Task-invariance was assessed at the individual level with correlation and at the group level with tests of equivalence.ResultsMost variables demonstrated acceptable test-retest reliability. Synergies and many features of APA activation varied across tasks, although at the individual level, motor performance time and amplitude of lumbar erector spinae activation were significantly correlated across tasks. Average pre-motor reaction time, external oblique latency, contralateral oblique amplitude and internal oblique coactivation were equivalent across tasks.SignificanceCharacteristics of trunk muscle APAs quantified during a single task may not be representative of an anticipatory postural control strategy that generalizes across tasks. Therefore, APAs must be assessed during multiple tasks with varying biomechanical demands to adequately investigate mechanisms contributing to movement dysfunction. The reliability analysis in this study facilitates interpretation of group differences or changes in APA behavior in response to intervention for the selected tasks.
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