Rosvall Felicia, Jedeskog Ulrika, Andersson Jonny K, Söderberg Thor, Hagert Elisabet
Department of Clinical Science and Education, Karolinska Institutet, Stockholm, Sweden.
Arcademy, H.M. Queen Sophia Hospital, Stockholm, Sweden.
J Hand Ther. 2021 Jan-Mar;34(1):100-108. doi: 10.1016/j.jht.2019.12.013. Epub 2020 Apr 13.
Descriptive reliability study.
A well-functioning wrist requires sufficient range of motion accompanied by adequate strength in every movement and direction-factors that are not regularly measured simultaneously in patients with wrist problems today. The ISOmetric Power device (ISOP) is a new instrument that measures isometric wrist force in all six directions of motion, but its intrarater reliability in a healthy population has not yet been evaluated.
The purpose of this study was to perform an intrarater reliability test of the ISOP in healthy participants.
Thirty-two healthy study participants (16 women/16 men; mean age 38.3 years; SD 6.5) were included. With a standardized testing protocol, the three planes of wrist motion- wrist flexion/extension, radial/ulnar deviation, pro/supination-were measured at one time interval (T1) and repeated after one week (T2). The results were analyzed using the intraclass correlation coefficient (ICC). A paired-samples t-test was also performed to determine if a statistically significant difference (P < .05) existed between the first and the second test values. Measurements with Jamar Dynamometer were performed at both time intervals, for internal control of measurement intrarater reliability.
Excellent correlations (ICC: 0.90-0.99) were found for all test-retests performed. The lowest value (ICC: 0.90) was seen for supination and the highest value (ICC: 0.99) for flexion of the left hand. No statistically significant differences were found in any of the pairs (P > .05) in terms of test-re-test, which additionally strengthen the correlation between the first and second test values.
Contrary to the Jamar Dynamometer, the ISOP is not designed for measuring grip strength, but for assessing the isometric muscle force in flexion, extension, pronation, supination, and radial and ulnar deviation. A systematic review has reported a moderate to strong correlation between isometric strength and dynamic performances. Thus, the ISOP is a more complete and applicable instrument for evaluating the functional strength in different directions in the upper extremity.
The ISOmetric Power device shows excellent intrarater reliability and is proposed to be a possible valuable wrist strength assessment tool to aid in both diagnostics and outcome measures of wrist and upper extremity disorders.
描述性可靠性研究。
功能良好的手腕需要有足够的活动范围，且在每个动作和方向上都具备足够的力量——而如今手腕问题患者中这些因素并未得到常规同步测量。等长力量测量装置（ISOP）是一种新仪器，可测量六个运动方向上的等长手腕力量，但尚未评估其在健康人群中的评分者内信度。
本研究旨在对健康参与者进行ISOP的评分者内信度测试。
纳入32名健康研究参与者（16名女性/16名男性；平均年龄38.3岁；标准差6.5）。按照标准化测试方案，在一个时间间隔（T1）测量手腕运动的三个平面——手腕屈伸、桡尺偏斜、旋前/旋后——并在一周后重复测量（T2）。结果采用组内相关系数（ICC）进行分析。还进行了配对样本t检验，以确定第一次和第二次测试值之间是否存在统计学显著差异（P < 0.05）。在两个时间间隔均使用Jamar握力计进行测量，以对测量的评分者内信度进行内部对照。
所有重测的相关性均极佳（ICC：0.90 - 0.99）。旋后测量值最低（ICC：0.90），左手屈曲测量值最高（ICC：0.99）。在重测方面，任何一组中均未发现统计学显著差异（P > 0.05），这进一步加强了第一次和第二次测试值之间的相关性。
与Jamar握力计不同，ISOP并非设计用于测量握力，而是用于评估屈伸、旋前、旋后以及桡尺偏斜方向上的等长肌力。一项系统评价报告称等长力量与动态表现之间存在中度至强相关性。因此，ISOP是一种更完整且适用的仪器，可用于评估上肢不同方向的功能力量。
等长力量测量装置显示出极佳的评分者内信度，被认为可能是一种有价值的手腕力量评估工具，有助于手腕和上肢疾病的诊断及疗效评估。
