Accuracy of predicting maximal quadriceps force from submaximal effort contractions after anterior cruciate ligament injury
Accuracy of predicting maximal quadriceps force from submaximal effort contractions after anterior cruciate ligament injury
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DOI：
10.1002/mus.20366
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发表时间：
2005-10-01
期刊：
影响因子：
3.4
通讯作者：
Snyder-Mackler, L
中科院分区：
文献类型：
--
作者：
Farquhar, SJ;Chmielewski, TL;Snyder-Mackler, L
前十字韧带(ACL)断裂后，股四头肌自主激活的无力和失败经常发生。两侧力量比较被用作进步的衡量标准，如果股四头肌有激活故障，这种比较是不准确的。爆发式叠加测试通常用于评估股四头肌在最大意志性等长收缩(MVIC)时的力量和激活情况，使用中枢激活率(CAR)计算。最近开发的一个数学模型从次最大努力中预测了MVIC。本研究的目的是将汽车的计算结果与数学模型进行比较。我们假设，当存在自愿激活失败时，该模型将比CAR计算更准确地预测强度。对100例单纯性前交叉韧带完全断裂受试者股四头肌受累和未受累的数据进行了回顾性评估。需要多次试验才能产生完全激活的MVIC(真MVIC)的受试者被用来比较CAR计算、数学模型和这一真MVIC。无法通过多次试验产生真正的MVIC的受试者被用来将数学模型与CAR计算进行比较。结果表明，两种方法都能可靠、准确地判断与前交叉韧带断裂相关的股四头肌无力程度。我们建议使用CAR计算来提供真实股四头肌力量的估计，以便于临床决定前交叉韧带断裂后的康复进展。
Weakness and failure of voluntary activation of the quadriceps femoris muscles often occur after anterior cruciate ligament (ACL) rupture. Side-to-side strength comparisons are used as a measure of progress, and are inaccurate if the quadriceps has activation failure. Burst superimposition testing is commonly used to assess quadriceps strength and activation during a maximal volitional isometric contraction (MVIC), using the central activation ratio (CAR) calculation. A recently developed mathematical model predicts the MVIC from submaximal efforts. The purpose of this study was to compare the CAR calculation to the mathematical model. We hypothesized that the model would be a more accurate predictor of strength than the CAR calculation when voluntary activation failure is present. Data from the involved and uninvolved quadriceps muscles of 100 consecutive subjects with complete, isolated ACL rupture were retrospectively evaluated. Subjects who required multiple trials to produce an MVIC with full activation (true MVIC) were used to compare the CAR calculation, the mathematical model, and this true MVIC. Subjects unable to produce a true MVIC with multiple trials were used to compare the mathematical model to the CAR calculation. Results demonstrate that both methods reliably and accurately estimate the quadriceps weakness associated with ACL rupture. We recommend use of the CAR calculation to provide estimations of true quadriceps strength to facilitate clinical decisions about progress in rehabilitation after ACL rupture.