Hong Jae-Soo, Ko Jeong-Bae, Ju Myeong-Min, Lee Byoung-Kwon, Park Dae-Sung, Lee Su-Ha
Regional Industrial Innovation Department, Korea Institute of Industrial Technology, Cheonan-si 31056, Republic of Korea.
Department of Physical Therapy, Konyang University, Daejeon 35365, Republic of Korea.
Sensors (Basel). 2025 May 8;25(10):2981. doi: 10.3390/s25102981.
This study aims to evaluate the reliability and validity of the Leg Strength Analyzer (IB-LS) in assessing isometric knee flexion and extension strength in elderly adults, compare its performance with that of the CSMI dynamometer, and examine its agreement with isokinetic knee strength measurements. A total of 21 elderly participants (mean age: 65.10 ± 4.56 years) were recruited. Participants underwent knee flexion and extension strength assessments using both the IB-LS and CSMI devices, with isokinetic strength at 60°/s measured in a follow-up session at least one day later. The IB-LS demonstrated high test-retest reliability in elderly adults (ICC = 0.856-0.987). The validity analysis comparing IB-LS isometric peak torque with CSMI isometric peak torque showed moderate to high validity (ICC = 0.826-0.946). Furthermore, IB-LS isometric peak torque and CSMI isokinetic 60°/s peak torque demonstrated high agreement (ICC = 0.775-0.881), demonstrating its strong association with isokinetic strength assessments. Bland-Altman analysis revealed that mean differences between IB-LS and CSMI isometric peak torque values ranged from 13.2 to 93.5 Nm, with limits of agreement (LoA) spanning from -55.8 to 192.5 Nm. When comparing IB-LS isometric peak torque with CSMI isokinetic 60°/s peak torque, mean differences ranged from 31.0 to 56.0 Nm, with LoA from -28.5 to 138.9 Nm. The IB-LS is a reliable and valid tool for evaluating isometric knee strength in elderly adults. Its strong agreement with the CSMI dynamometer and close correlation with isokinetic strength measurements indicate that IB-LS can be a feasible alternative for assessing knee strength in clinical and research settings focused on elderly populations.
本研究旨在评估腿部力量分析仪（IB-LS）在评估老年人等长屈膝和伸膝力量方面的可靠性和有效性，将其性能与CSMI测力计进行比较，并检验其与等速膝关节力量测量结果的一致性。共招募了21名老年参与者（平均年龄：65.10±4.56岁）。参与者使用IB-LS和CSMI设备进行屈膝和伸膝力量评估，并在至少一天后的随访中测量60°/s的等速力量。IB-LS在老年人中显示出较高的重测可靠性（ICC = 0.856 - 0.987）。将IB-LS等长峰值扭矩与CSMI等长峰值扭矩进行比较的效度分析显示出中等到高度的效度（ICC = 0.826 - 0.946）。此外，IB-LS等长峰值扭矩与CSMI 60°/s等速峰值扭矩显示出高度一致性（ICC = 0.775 - 0.881），表明其与等速力量评估有很强的关联。Bland-Altman分析显示，IB-LS和CSMI等长峰值扭矩值之间的平均差异范围为13.2至93.5 Nm，一致性界限（LoA）为-55.8至192.5 Nm。当将IB-LS等长峰值扭矩与CSMI 60°/s等速峰值扭矩进行比较时，平均差异范围为31.0至56.0 Nm，LoA为-28.5至138.9 Nm。IB-LS是评估老年人等长膝关节力量的可靠且有效的工具。它与CSMI测力计的高度一致性以及与等速力量测量的密切相关性表明，在针对老年人群的临床和研究环境中，IB-LS可以作为评估膝关节力量的可行替代方法。
