等长膝关节力量测试中拮抗肌活动和峰值扭矩的变异性。
Variability in antagonist muscle activity and peak torque during isometric knee strength testing.
作者信息
Krishnan Chandramouli, Williams Glenn N
机构信息
Graduate Program in Physical Therapy & Rehabilitation Science, University of Iowa, Iowa City, IA, USA.
出版信息
Iowa Orthop J. 2009;29:149-58.
BACKGROUND & OBJECTIVE: Strength testing is common in the treatment of people with knee pathology and in research related to knee health. Variability in the magnitude of antagonist muscle activity and peak torque measurements during isometric knee strength testing is not well defined and has potential implications of strength test validity and reliability. The aim of this study was to determine the magnitude and variability (side-to-side, session-to-session) of antagonist muscle activity and peak torque during isometric knee strength testing and to compare and contrast the results of males and females.
METHODS
Electromyograms and torque data were collected from 30 active young people (15 males, 15 females) during isometric strength testing of the knee extensors and flexors at two sessions that took place approximately one week apart. The magnitude of antagonist muscle activity and peak torque during isometric knee strength testing was calculated and the variability in these parameters assessed.
RESULTS
Significant side-to-side differences were observed in the magnitude of antagonist muscle activity when the leg with higher antagonist activity was contrasted with the leg with lower antagonist activity (P < 0.001). Significant side-to-side differences were also observed when peak torque measurements were contrasted in a similar manner (P < 0.001). No significant differences were observed in peak torque and antagonist activity measurements between sessions. Significantly higher vastus medialis antagonist activity was observed in females (P < 0.001).
CONCLUSIONS
Our findings suggest that significant variability in antagonist muscle activity and peak torque is present during maximal isometric knee strength testing. This variability may reduce the accuracy of knee strength tests, especially when side-to-side comparisons are made as is typical in clinical settings. The results of this study may be helpful when interpreting strength test results and setting criteria for patient progression.
背景与目的
力量测试在膝关节病变患者的治疗以及与膝关节健康相关的研究中很常见。等长膝关节力量测试期间拮抗肌活动幅度和峰值扭矩测量的变异性尚未明确界定，这对力量测试的有效性和可靠性有潜在影响。本研究的目的是确定等长膝关节力量测试期间拮抗肌活动和峰值扭矩的幅度及变异性（左右侧之间、不同测试 session 之间），并比较男性和女性的结果。
方法
在大约相隔一周的两个 session 中，对等长测试膝关节伸肌和屈肌时的 30 名活跃年轻人（15 名男性，15 名女性）收集肌电图和扭矩数据。计算等长膝关节力量测试期间拮抗肌活动的幅度和峰值扭矩，并评估这些参数的变异性。
结果
当将拮抗肌活动较高的腿与拮抗肌活动较低的腿进行对比时，观察到拮抗肌活动幅度存在显著的左右侧差异（P < 0.001）。以类似方式对比峰值扭矩测量值时，也观察到显著的左右侧差异（P < 0.001）。不同 session 之间的峰值扭矩和拮抗肌活动测量值未观察到显著差异。女性的股内侧肌拮抗肌活动显著更高（P < 0.001）。
结论
我们的研究结果表明，在最大等长膝关节力量测试期间，拮抗肌活动和峰值扭矩存在显著变异性。这种变异性可能会降低膝关节力量测试的准确性，尤其是在临床环境中进行典型的左右侧比较时。本研究结果在解释力量测试结果和为患者进展设定标准时可能会有所帮助。
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