Comparative Analysis of Lower Limb Muscle Activity During Isometric External Rotation in Static and Dynamic Modeling Approaches
This study investigates differences in lower limb muscle activity during isometric external hip rotation while standing using static and dynamic models within the AnyBody Modeling System. Thirty-three participants performed controlled isometric rotations using a custom-designed device capable of sim...
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MDPI AG
2025-06-01
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| author | Miłosz Chrzan Robert Michnik Sławomir Suchoń Michał Burkacki Katarzyna Nowakowska-Lipiec |
| author_facet | Miłosz Chrzan Robert Michnik Sławomir Suchoń Michał Burkacki Katarzyna Nowakowska-Lipiec |
| author_sort | Miłosz Chrzan |
| collection | DOAJ |
| description | This study investigates differences in lower limb muscle activity during isometric external hip rotation while standing using static and dynamic models within the AnyBody Modeling System. Thirty-three participants performed controlled isometric rotations using a custom-designed device capable of simultaneously measuring rotational moments and ground reaction forces. Both static and dynamic simulations were conducted for each subject using personalized biomechanical models. Muscle activity values at the point of peak rotational moment were analyzed for twelve key muscles involved in hip rotation and stabilization of the knee joint, and statistical differences were assessed for significance. Muscles from the gluteal group (<i>Gluteus minimus</i>, <i>medius</i>, and <i>maximus</i>) generally showed lower activation in dynamic simulations, although this trend was not statistically significant for all muscles or test conditions. The mean difference in muscle activity values between static and dynamic simulations was between 0.03 and 0.08 for the gluteal group muscles and up to 0.15 for the <i>Iliopsoas</i>. Static models overestimated the role of stabilizers. Significant differences (<i>p</i> ≤ 0.05, Wilcoxon signed-rank test) were observed between the two approaches in terms of predicted muscle activation. In conclusion, discrepancies in muscle activity predictions between static and dynamic simulations highlight the need for task-specific simulation design and careful result interpretation. |
| format | Article |
| id | doaj-art-adf852f7edea47d0afb6c7f5ef1745b6 |
| institution | DOAJ |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-adf852f7edea47d0afb6c7f5ef1745b62025-08-20T03:11:30ZengMDPI AGApplied Sciences2076-34172025-06-011511635410.3390/app15116354Comparative Analysis of Lower Limb Muscle Activity During Isometric External Rotation in Static and Dynamic Modeling ApproachesMiłosz Chrzan0Robert Michnik1Sławomir Suchoń2Michał Burkacki3Katarzyna Nowakowska-Lipiec4Department of Biomechatronics, Faculty of Biomedical Engineering, Silesian University of Technology, 41-800 Zabrze, PolandDepartment of Biomechatronics, Faculty of Biomedical Engineering, Silesian University of Technology, 41-800 Zabrze, PolandDepartment of Biomechatronics, Faculty of Biomedical Engineering, Silesian University of Technology, 41-800 Zabrze, PolandDepartment of Biomechatronics, Faculty of Biomedical Engineering, Silesian University of Technology, 41-800 Zabrze, PolandDepartment of Biomechatronics, Faculty of Biomedical Engineering, Silesian University of Technology, 41-800 Zabrze, PolandThis study investigates differences in lower limb muscle activity during isometric external hip rotation while standing using static and dynamic models within the AnyBody Modeling System. Thirty-three participants performed controlled isometric rotations using a custom-designed device capable of simultaneously measuring rotational moments and ground reaction forces. Both static and dynamic simulations were conducted for each subject using personalized biomechanical models. Muscle activity values at the point of peak rotational moment were analyzed for twelve key muscles involved in hip rotation and stabilization of the knee joint, and statistical differences were assessed for significance. Muscles from the gluteal group (<i>Gluteus minimus</i>, <i>medius</i>, and <i>maximus</i>) generally showed lower activation in dynamic simulations, although this trend was not statistically significant for all muscles or test conditions. The mean difference in muscle activity values between static and dynamic simulations was between 0.03 and 0.08 for the gluteal group muscles and up to 0.15 for the <i>Iliopsoas</i>. Static models overestimated the role of stabilizers. Significant differences (<i>p</i> ≤ 0.05, Wilcoxon signed-rank test) were observed between the two approaches in terms of predicted muscle activation. In conclusion, discrepancies in muscle activity predictions between static and dynamic simulations highlight the need for task-specific simulation design and careful result interpretation.https://www.mdpi.com/2076-3417/15/11/6354musculoskeletal systemlower limbisometric rotationmathematical modelingAnyBody Modeling System |
| spellingShingle | Miłosz Chrzan Robert Michnik Sławomir Suchoń Michał Burkacki Katarzyna Nowakowska-Lipiec Comparative Analysis of Lower Limb Muscle Activity During Isometric External Rotation in Static and Dynamic Modeling Approaches Applied Sciences musculoskeletal system lower limb isometric rotation mathematical modeling AnyBody Modeling System |
| title | Comparative Analysis of Lower Limb Muscle Activity During Isometric External Rotation in Static and Dynamic Modeling Approaches |
| title_full | Comparative Analysis of Lower Limb Muscle Activity During Isometric External Rotation in Static and Dynamic Modeling Approaches |
| title_fullStr | Comparative Analysis of Lower Limb Muscle Activity During Isometric External Rotation in Static and Dynamic Modeling Approaches |
| title_full_unstemmed | Comparative Analysis of Lower Limb Muscle Activity During Isometric External Rotation in Static and Dynamic Modeling Approaches |
| title_short | Comparative Analysis of Lower Limb Muscle Activity During Isometric External Rotation in Static and Dynamic Modeling Approaches |
| title_sort | comparative analysis of lower limb muscle activity during isometric external rotation in static and dynamic modeling approaches |
| topic | musculoskeletal system lower limb isometric rotation mathematical modeling AnyBody Modeling System |
| url | https://www.mdpi.com/2076-3417/15/11/6354 |
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