一种便携式应变仪装置与商用等速测力计在评估膝关节伸展动力学方面的有效性
The Validity of a Portable Strain-Gauge Apparatus Versus a Commercial Isokinetic Dynamometer for Evaluating Knee Extension Kinetics.
作者信息
Oranchuk Dustin, Juneau Chris, Diewald Shelley, Neville Jono, Cronin John
机构信息
Department of Physical Medicine and Rehabilitation University of Colorado Anschutz Medical Campus.
Sports Performance Research Institute New Zealand Auckland University of Technology.
出版信息
Int J Sports Phys Ther. 2024 Mar 2;19(3):258-267. doi: 10.26603/001c.92742. eCollection 2024.
BACKGROUND
Isokinetic dynamometers are widely used when assessing neuromuscular function including knee extension kinetics. However, these dynamometers are often prohibitively expensive and are not portable. Thus strain-gauge technology has grown in popularity.
PURPOSE
The purpose of this study was to compare kinetic data captured via an isokinetic dynamometer against an affordable and portable strain-gauge with a treatment plinth during maximal isometric knee extensions.
STUDY DESIGN
Cross-sectional study.
METHODS
Healthy participants (8 males and 6 females; age 30.2±7.1 years) volunteered and performed knee extensions at a 90° knee angle on a dynamometer and a treatment plinth with a portable strain-gauge. Peak force (PF), peak rate of force development (PRFD), rate of force development (RFD) and impulse (IMP) from 20-80% of onset to peak force were assessed using both strain-gauge and isokinetic dynamometer. Between-device differences were evaluated by the Wilcoxon signed-rank test, Cohen's effect sizes (ES), Pearson's correlation coefficients (), and Bland-Altman plots.
RESULTS
No significant or meaningful differences were identified between isokinetic and strain-gauge devices (all ≥0.268, ES≤0.35). However, slightly greater (2.5-9.5%) outputs were observed with the isokinetic dynamometer. Very large significant between-device correlations were found for PF (=0.77, =0.001) and PRFD (=0.73, =0.003), while small and moderate non-significant between-device correlations were found for RFD (=0.48, =0.079) and IMP (=0.59, =0.060). Bland-Altman plots did not reveal apparent biases from high to low performers.
CONCLUSIONS
These results indicate that the strain-gauge device can produce valid maximal and rapid force expression measurements. Similar results, such as those quantified via an isokinetic device, can be obtained without extreme rigour and constraint. The study's findings support using the practically relevant treatment plinth and strain-gauge combination as a suitable alternative to the isokinetic dynamometry for measuring PF and PRFD. Therefore, more rehabilitation and sports performance practitioners can confidently assess knee extension kinetics.
LEVEL OF EVIDENCE
背景
等速测力计在评估包括膝关节伸展动力学在内的神经肌肉功能时被广泛使用。然而，这些测力计通常价格昂贵且不可携带。因此，应变片技术越来越受欢迎。
目的
本研究的目的是在最大等长膝关节伸展过程中，比较通过等速测力计与一种价格实惠且便携的带有治疗台的应变片所采集的动力学数据。
研究设计
横断面研究。
方法
健康参与者（8名男性和6名女性；年龄30.2±7.1岁）自愿参与，在测力计和带有便携式应变片的治疗台上以90°膝关节角度进行膝关节伸展。使用应变片和等速测力计评估从发力开始到峰值力的20%至80%期间的峰值力（PF）、峰值力发展速率（PRFD）、力发展速率（RFD）和冲量（IMP）。通过Wilcoxon符号秩检验、Cohen效应量（ES）、Pearson相关系数（）和Bland-Altman图评估设备间差异。
结果
等速测力计和应变片设备之间未发现显著或有意义的差异（所有P≥0.268，ES≤0.35）。然而，等速测力计的输出略高（2.5 - 9.5%）。发现PF（r = 0.77，P = 0.001）和PRFD（r = 0.73，P = 0.003）在设备间具有非常大的显著相关性，而RFD（r = 0.48，P = 0.079）和IMP（r = 0.59，P = 0.060）在设备间具有小到中等的非显著相关性。Bland-Altman图未显示出从高表现者到低表现者的明显偏差。
结论
这些结果表明，应变片设备能够产生有效的最大和快速力表达测量值。无需极端严格和受限的条件即可获得与通过等速设备量化的结果类似的结果。该研究结果支持使用实际相关的治疗台和应变片组合作为测量PF和PRFD的等速测力法的合适替代方法。因此，更多的康复和运动表现从业者可以自信地评估膝关节伸展动力学。
证据水平
3级。
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