Zöger Manfred, Nimmerichter Alfred, Baca Arnold, Wirth Klaus
Training and Sports Sciences, University of Applied Sciences Wiener Neustadt, Johannes Gutenberg-Straße 3, Wiener Neustadt, 2700, Austria.
Centre for Sport Science and University Sports, University of Vienna, Auf der Schmelz 6, Wien, 1150, Austria.
BMC Sports Sci Med Rehabil. 2025 Jan 29;17(1):14. doi: 10.1186/s13102-025-01061-1.
Isokinetic dynamometry is a common tool for evaluating muscle function and is used across various disciplines. Technical advancements have shifted focus towards multi-joint exercises such as the leg press, offering insights into practical human movement dynamics. However, previous reproducibility studies have focused predominantly on single-joint exercises, warranting investigations into the reliability of multi-joint exercises. This study aimed to assess the reproducibility of peak force (PF) during multi-joint leg press exercises using the IsoMed 2000 dynamometer.
Thirty physically active subjects (mean: stature 179.4 cm; body mass 76.0 kg; age 30.6 years) participated in three testing sessions. Each session consisted of isometric and isokinetic leg press exercises. Knee angles for isometric exercises included 100° and 140°; velocities for isokinetic exercise included 30 mm/s and 600 mm/s. The first session served as the familiarization session. Statistical analysis included paired sample t-tests, Cohen's d effect sizes, intraclass correlation coefficients (ICC), standard errors of measurement (SEM), and Bland-Altman calculations, including corresponding plots.
Descriptive data revealed consistent PF across sessions, with a significant between-sessions difference observed only for isometric (100°) leg extension in the right leg (p < 0.001; d = 0.13). ICC calculations showed high relative reproducibility (ICC > 0.911), with SEM ranging from 37.6 to 294.7 N (SEM% 2.3-6.3%, respectively). Bland-Altman plots depicted minimal intersession disparities (-141.8-68.3 N, respectively - 3.02-1.26%), supporting high reliability.
This study highlights the reliability of assessing peak force during isometric and isokinetic leg press exercises using the IsoMed 2000 after a single familiarization session. These findings support its utility in muscular performance evaluation, urging practitioners to incorporate familiarization trials for accurate assessments.
等速测力法是评估肌肉功能的常用工具，广泛应用于各个学科。技术进步使人们将重点转向多关节运动，如腿举，从而深入了解实际人体运动动力学。然而，以往的重复性研究主要集中在单关节运动上，因此有必要对多关节运动的可靠性进行研究。本研究旨在使用IsoMed 2000测力计评估多关节腿举运动中峰值力（PF）的重复性。
30名身体活跃的受试者（平均身高179.4厘米；体重76.0千克；年龄30.6岁）参加了三次测试。每次测试包括等长和等速腿举运动。等长运动的膝关节角度包括100°和140°；等速运动的速度包括30毫米/秒和600毫米/秒。第一次测试作为熟悉测试。统计分析包括配对样本t检验、科恩d效应量、组内相关系数（ICC）、测量标准误差（SEM）以及布兰德-奥特曼计算，包括相应的图表。
描述性数据显示各测试之间的PF一致，仅右侧腿等长（1百）腿伸展在各测试之间存在显著差异（p < 0.001；d = 0.13）。ICC计算显示相对重复性较高（ICC > 0.911），SEM范围为37.6至294.7牛（SEM%分别为2.3 - 6.3%）。布兰德-奥特曼图显示各测试之间的差异极小（分别为-141.8至68.3牛，-3.02至1.26%），支持高可靠性。
本研究强调了在单次熟悉测试后，使用IsoMed 2000评估等长和等速腿举运动中峰值力的可靠性。这些发现支持其在肌肉性能评估中的实用性，促使从业者纳入熟悉测试以进行准确评估。
