Validity and reliability of a novel portable tension-gauge dynamometer for isometric and isotonic seated knee extension strength measurement.

IF 2 4区医学 Q3 ORTHOPEDICS

Knee Pub Date : 2025-10-01 Epub Date: 2025-08-06 DOI:10.1016/j.knee.2025.07.013

Katsumi Takeno, Victor L Katch, Grant E Norte, Christopher D Ingersoll

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引用次数: 0

Abstract

Background: 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.

Methods: 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.

Results: We observed a very high correlation in the MVICs obtained between devices (r = 0.98, p < 0.001, R² = 0.96).We observed good-to-excellent reliability for MVIC force (ICC_3,1 = 0.94 [0.86, 0.98], p = 0.01), good-to-excellent reliability for peak isotonic force against external load at 25 % MVIC (ICC_3,1 = 0.95 [0.87, 0.98], p < 0.001), and excellent reliability for peak isotonic force against external load at 30 % MVIC (ICC_3,1 = 0.97 [0.93, 0.99], p < 0.001).

Conclusions: 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.

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一种新型便携式张力计用于坐式膝关节伸展强度测量的有效性和可靠性。

背景：可获得的多模态强度测量对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速和等速强度测量的黄金标准，但其实际应用受到测量等压强度不足、成本高和需要广泛物理空间的限制。建立使用便携式测功机评估等压强度的技术可以提高性能评估。我们的目的是确定使用一种新型便携式张力计进行等距和等张膝关节拉伸强度测量的有效性和重测可靠性。方法：20名积极从事娱乐活动的大学生参与研究。我们记录膝关节伸展最大自主等距收缩（MVIC）力使用张力计和等速测功仪的有效性和可靠性。在间隔7天的两次测试中，使用张力计测力仪记录了在相当于25%和30% MVIC的外部负载下的峰值等压膝关节伸直力。结果：我们观察到不同器械间获得的mvic具有非常高的相关性（r = 0.98, p 2 = 0.96）。我们观察到MVIC力的良好到优异的可靠性（ICC3,1 = 0.94 [0.86, 0.98], p = 0.01），在25% MVIC时，对外部负载的峰值等压力的良好到优异的可靠性(ICC3,1 = 0.95 [0.87, 0.98], p 3,1 = 0.97 [0.93, 0.99]， p结论：有效和可靠的基于力的结果可以使用一种新型的张力计测力仪来测量，它可以为临床和研究提供相关的肌肉功能特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Knee 医学-外科

CiteScore

3.80

自引率

5.30%

发文量

171

审稿时长

6 months

期刊介绍： The Knee is an international journal publishing studies on the clinical treatment and fundamental biomechanical characteristics of this joint. The aim of the journal is to provide a vehicle relevant to surgeons, biomedical engineers, imaging specialists, materials scientists, rehabilitation personnel and all those with an interest in the knee. The topics covered include, but are not limited to: • Anatomy, physiology, morphology and biochemistry; • Biomechanical studies; • Advances in the development of prosthetic, orthotic and augmentation devices; • Imaging and diagnostic techniques; • Pathology; • Trauma; • Surgery; • Rehabilitation.