Reproducibility of peak force for isometric and isokinetic multi-joint leg extension exercise
Abstract Background 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, previou...
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2025-01-01
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| Series: | BMC Sports Science, Medicine and Rehabilitation |
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| Online Access: | https://doi.org/10.1186/s13102-025-01061-1 |
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| author | Manfred Zöger Alfred Nimmerichter Arnold Baca Klaus Wirth |
| author_facet | Manfred Zöger Alfred Nimmerichter Arnold Baca Klaus Wirth |
| author_sort | Manfred Zöger |
| collection | DOAJ |
| description | Abstract Background 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. Methods 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. Results 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. Conclusions 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. |
| format | Article |
| id | doaj-art-462eb331b33e443bb2b7ca867b996acf |
| institution | Kabale University |
| issn | 2052-1847 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | BMC |
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| series | BMC Sports Science, Medicine and Rehabilitation |
| spelling | doaj-art-462eb331b33e443bb2b7ca867b996acf2025-02-02T12:36:22ZengBMCBMC Sports Science, Medicine and Rehabilitation2052-18472025-01-011711810.1186/s13102-025-01061-1Reproducibility of peak force for isometric and isokinetic multi-joint leg extension exerciseManfred Zöger0Alfred Nimmerichter1Arnold Baca2Klaus Wirth3Training and Sports Sciences, University of Applied Sciences Wiener NeustadtTraining and Sports Sciences, University of Applied Sciences Wiener NeustadtCentre for Sport Science and University Sports, University of ViennaTraining and Sports Sciences, University of Applied Sciences Wiener NeustadtAbstract Background 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. Methods 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. Results 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. Conclusions 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.https://doi.org/10.1186/s13102-025-01061-1DynamometerIsokineticIsomed 2000IsometricLeg pressReproducibility |
| spellingShingle | Manfred Zöger Alfred Nimmerichter Arnold Baca Klaus Wirth Reproducibility of peak force for isometric and isokinetic multi-joint leg extension exercise BMC Sports Science, Medicine and Rehabilitation Dynamometer Isokinetic Isomed 2000 Isometric Leg press Reproducibility |
| title | Reproducibility of peak force for isometric and isokinetic multi-joint leg extension exercise |
| title_full | Reproducibility of peak force for isometric and isokinetic multi-joint leg extension exercise |
| title_fullStr | Reproducibility of peak force for isometric and isokinetic multi-joint leg extension exercise |
| title_full_unstemmed | Reproducibility of peak force for isometric and isokinetic multi-joint leg extension exercise |
| title_short | Reproducibility of peak force for isometric and isokinetic multi-joint leg extension exercise |
| title_sort | reproducibility of peak force for isometric and isokinetic multi joint leg extension exercise |
| topic | Dynamometer Isokinetic Isomed 2000 Isometric Leg press Reproducibility |
| url | https://doi.org/10.1186/s13102-025-01061-1 |
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