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Toward isometric force capabilities evaluation by using a musculoskeletal model: Comparison with direct force
Vincent Hernandez1, Nasser Rezzoug1, Philippe Gorce1
1HandiBio-EA 4322-Université de Toulon, Toulon-Var, 83957 La Garde Cedex, France.
Journal of Biomechanics
|July 25, 2015
Summary
This study compared human hand force capabilities measured experimentally with predictions from an upper-limb musculoskeletal model. While model predictions showed differences in force output shape, they offered valuable insights for biomechanics and ergonomics.
Area of Science:
- Biomechanics
- Human Factors Engineering
- Computational Modeling
Background:
- Accurate determination of human limb force capabilities is crucial for biomechanical and ergonomic applications.
- Musculoskeletal models offer a computational framework to predict human force generation.
- Comparing model predictions with experimental measurements is essential for model validation.
Purpose of the Study:
- To compare measured maximal isometric hand force capabilities with forces computed using an upper-limb musculoskeletal model.
- To represent and analyze these forces using force polytopes (measured force polytope - MFP and musculoskeletal force polytope - MSFP).
- To evaluate the accuracy and utility of the musculoskeletal model for predicting human force capabilities.
Main Methods:
- Nine subjects performed maximal isometric force exertions at the hand in 26 Cartesian directions for a specific posture.
- Forces were measured using a triaxial force sensor and recorded with an optoelectronic system.
- Computed forces from an upper-limb musculoskeletal model were generated, and both measured and computed forces were represented as convex hulls (MFP and MSFP).
Main Results:
- Significant differences were observed in the global shapes of the MFP and MSFP, with the MSFP being more elongated.
- No significant difference was found in the volumes of the MFP and MSFP.
- Mean maximal isometric forces were 509.6 N (MFP) and 627.9 N (MSFP), with a small average angle (5.5°) between their main axes and low RMS errors (<100N in 88% of directions).
Conclusions:
- The musculoskeletal model provides valuable information on optimal force orientation parameters, despite shape differences compared to experimental measurements.
- The model demonstrates potential for applications in ergonomics, rehabilitation, and biomechanics.
- Further refinement of musculoskeletal models can enhance the prediction of human force capabilities.
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