Woolhead Ellie, Partner Richard, Parsley Megan, Jones Ashley
School of Health Leeds Beckett University.
Int J Sports Phys Ther. 2024 Nov 2;19(11):1397-1406. doi: 10.26603/001c.124121. eCollection 2024.
Fixed-frame dynamometry systems are used worldwide to assess isometric strength in both general and athletic populations. There is currently a paucity of published work where reliability estimates for fixed-frame dynamometry systems have been estimated. The aim of this study was to determine the inter-and intra-rater reliability of the KangaTech (KT360) fixed frame dynamometry system when measuring maximal isometric strength of the knee flexor muscles.
Inter and intra-rater reliability single cohort study.
Twenty healthy university-level athletes (age= 21.65 ± 3 years, weight= 74.465 ± 30kg, height= 170.1 ± 7.0cm) took part in two testing sessions where two raters collected data during a 90° hip and knee flexion protocol. Participants performed each test twice, building to a maximal isometric contraction holding over a 5 second period with 30 second rest between sets. Data were checked for normality using a Shapiro-Wilk test. Intraclass correlation coefficient (ICC), standard error of measurement (SEM) and minimal detectable change (MDC) were calculated. Finally, a Bland-Altman analysis was used to determine the levels of agreement for intra-and inter-rater measurements.
High levels of agreement were demonstrated between left and right knee flexion as 95% of the differences were less than two standard deviations away from the mean. 'Almost perfect' intraclass correlation coefficient (ICC) values were demonstrated (Knee flexion: Inter-rater: Left, 0.99; Right, 0.99; Intra-rater: Left, 0.99; Right:0.99). Standard error of measurement (SEM) for inter-and intra-rater strength ranged from 0.26-0.69 kg, SEM% ranged from 1.34-2.71% and minimal detectable change (MDC) ranged from 1.14-2.31kg.
Overall, high level of inter-and intra-rater reliability were demonstrated when testing maximal isometric knee flexion. Therefore, the KT360 fixed frame dynamometry system may be considered a viable tool for measuring maximal isometric contraction of the knee flexors when repeat measures are required in clinical settings.
3b.
固定框架测力计系统在全球范围内用于评估普通人群和运动员的等长肌力。目前，已发表的关于固定框架测力计系统可靠性估计的研究较少。本研究的目的是确定KangaTech（KT360）固定框架测力计系统在测量膝屈肌最大等长肌力时的评分者间和评分者内信度。
评分者间和评分者内信度单队列研究。
20名健康的大学水平运动员（年龄=21.65±3岁，体重=74.465±30kg，身高=170.1±7.0cm）参加了两次测试，在90°髋关节和膝关节屈曲方案中，两名评分者收集数据。参与者每项测试进行两次，逐渐达到最大等长收缩，并保持5秒，每组之间休息30秒。使用Shapiro-Wilk检验检查数据的正态性。计算组内相关系数（ICC）、测量标准误差（SEM）和最小可检测变化（MDC）。最后，使用Bland-Altman分析来确定评分者内和评分者间测量的一致性水平。
左右膝屈曲之间显示出高度一致性，因为95%的差异离平均值不到两个标准差。显示出“几乎完美”的组内相关系数（ICC）值（膝屈曲：评分者间：左，0.99；右，0.99；评分者内：左，0.99；右：0.99）。评分者间和评分者内力量的测量标准误差（SEM）范围为0.26 - 0.69kg，SEM%范围为1.34 - 2.71%，最小可检测变化（MDC）范围为1.14 - 2.31kg。
总体而言，在测试最大等长膝屈曲时，显示出高度的评分者间和评分者内信度。因此，当临床环境中需要重复测量时，KT360固定框架测力计系统可被视为测量膝屈肌最大等长收缩的可行工具。
3b。
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