Takeno Katsumi, Katch Victor L, Norte Grant E, Ingersoll Christopher D
Department of Kinesiology, University of North Georgia, Dahlonega, GA, USA.
Department of Kinesiology, University of Michigan, Ann Arbor, MI, USA.
Knee. 2025 Oct;56:646-656. doi: 10.1016/j.knee.2025.07.013. Epub 2025 Aug 6.
Accessible measurements of multimodal strength are essential to clinical practice and outcome research. While isokinetic dynamometers are considered the gold standard for isometric and isokinetic strength measurement, their practical use is limited by the insufficiency to measure isotonic strength, high cost, and needs for extensive physical space. Establishing techniques to assess isotonic strength using a portable dynamometer may enhance performance evaluations. Our objective was to determine the validity and test-retest reliability of isometric and isotonic knee extension strength measurements using a novel portable tension-gauge dynamometer.
Twenty recreationally active college-aged individuals participated. We recorded knee extension maximal voluntary isometric contraction (MVIC) force using both a tension-gauge dynamometer and an isokinetic dynamometer for validity and reliability. Peak isotonic knee extension force was recorded against external loads equivalent to 25 % and 30 % MVIC using the tension-gauge dynamometer for test-retest reliability during two sessions 7 days apart.
We observed a very high correlation in the MVICs obtained between devices (r = 0.98, p < 0.001, R = 0.96).We observed good-to-excellent reliability for MVIC force (ICC = 0.94 [0.86, 0.98], p = 0.01), good-to-excellent reliability for peak isotonic force against external load at 25 % MVIC (ICC = 0.95 [0.87, 0.98], p < 0.001), and excellent reliability for peak isotonic force against external load at 30 % MVIC (ICC = 0.97 [0.93, 0.99], p < 0.001).
Valid and reliable force-based outcomes can be measured using a novel, tension-gauge dynamometer, which may provide relevant characteristics of muscle function for clinical and research uses.
多模式力量的可获取测量对于临床实践和结果研究至关重要。虽然等速测力计被认为是等长和等速力量测量的金标准，但其实际应用受到测量等张力量不足、成本高以及需要大量物理空间的限制。建立使用便携式测力计评估等张力量的技术可能会提高性能评估。我们的目标是确定使用新型便携式张力计测力计进行等长和等张膝关节伸展力量测量的有效性和重测可靠性。
20名有运动习惯的大学生参与。我们使用张力计测力计和等速测力计记录膝关节伸展最大自主等长收缩（MVIC）力，以评估有效性和可靠性。使用张力计测力计记录在相当于25%和30%MVIC的外部负荷下的等张膝关节伸展峰值力，在间隔7天的两个时段进行重测可靠性评估。
我们观察到两种设备测得的MVIC之间具有非常高的相关性（r = 0.98，p < 0.001，R = 0.96）。我们观察到MVIC力具有良好到优秀的可靠性（ICC = 0.94 [0.86, 0.98]，p = 0.01），在25%MVIC外部负荷下等张峰值力具有良好到优秀的可靠性（ICC = 0.95 [0.87, 0.98]，p < 0.001），在30%MVIC外部负荷下等张峰值力具有优秀的可靠性（ICC = 0.97 [0.93, 0.99]，p < 0.001）。
使用新型张力计测力计可以测量有效且可靠的基于力量的结果，这可能为临床和研究用途提供肌肉功能的相关特征。
