Embodiment of intra-abdominal pressure in a flexible multibody model of the trunk and the spinal unloading effects during static lifting tasks

Guo, Jianqiao; Guo, Wei; Ren, Gexue

doi:10.1007/s10237-021-01465-1

Cited by 23 publications

(25 citation statements)

References 96 publications

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“…The increase of IAP during forward flexion and lifting tasks has shown to stabilise and unload the lumbar spine (Stokes et al 2010;Hodges et al 2005). In a recent study, Guo and colleagues demonstrated the IAPinduced spinal unloading effect during abdominal breathing in a flexed posture using a detailed generic spine model by considering a biomechanical representation of the abdominal cavity in combination with flexible multibody (MB) modelling of core muscles (Guo et al 2021). The influence of IAP is not modelled in our model so far and should be considered in future work.…”

Section: Critical Review Of the Developed Models With Respect To Exis...mentioning

confidence: 99%

“…In recent years, an increasing number of musculoskeletal multibody (MB) spine models have been developed focusing on the detailed modelling of the lumbar (Christophy et al 2012;Rupp et al 2015;Mörl et al 2020), thoracolumbar (Bruno et al 2015 anatomy and musculature, and the simulation of sophisticated activities, such as various lifting (Beaucage-Gauvreau et al 2019;Molinaro et al 2020) or sporting tasks (Raabe and Chaudhari 2016;Cazzola et al 2017;Silvestros et al 2019Silvestros et al , 2022. In a recent study by Guo et al (2021), a full spine model was introduced demonstrating the sensitivity of spinal loading predictions to intra-abdominal pressure (IAP). These models assume generic geometries, some of which were scaled in their height or dimensions to fit a specific subject or group of the population -a start level of individualisation.…”

Section: Introductionmentioning

confidence: 99%

“…In a recent study by Guo et al. ( 2021 ), a full spine model was introduced demonstrating the sensitivity of spinal loading predictions to intra-abdominal pressure (IAP). These models assume generic geometries, some of which were scaled in their height or dimensions to fit a specific subject or group of the population - a start level of individualisation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of geometric individualisation of a human spine model on load sharing: neuro-musculoskeletal simulation reveals significant differences in ligament and muscle contribution

Meszaros-Beller

Hammer

Riede

et al. 2023

Biomech Model Mechanobiol

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In spine research, two possibilities to generate models exist: generic (population-based) models representing the average human and subject-specific representations of individuals. Despite the increasing interest in subject specificity, individualisation of spine models remains challenging. Neuro-musculoskeletal (NMS) models enable the analysis and prediction of dynamic motions by incorporating active muscles attaching to bones that are connected using articulating joints under the assumption of rigid body dynamics. In this study, we used forward-dynamic simulations to compare a generic NMS multibody model of the thoracolumbar spine including fully articulated vertebrae, detailed musculature, passive ligaments and linear intervertebral disc (IVD) models with an individualised model to assess the contribution of individual biological structures. Individualisation was achieved by integrating skeletal geometry from computed tomography and custom-selected muscle and ligament paths. Both models underwent a gravitational settling process and a forward flexion-to-extension movement. The model-specific load distribution in an equilibrated upright position and local stiffness in the L4/5 functional spinal unit (FSU) is compared. Load sharing between occurring internal forces generated by individual biological structures and their contribution to the FSU stiffness was computed. The main finding of our simulations is an apparent shift in load sharing with individualisation from an equally distributed element contribution of IVD, ligaments and muscles in the generic spine model to a predominant muscle contribution in the individualised model depending on the analysed spine level.

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Section: Critical Review Of the Developed Models With Respect To Exis...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of geometric individualisation of a human spine model on load sharing: neuro-musculoskeletal simulation reveals significant differences in ligament and muscle contribution

Meszaros-Beller

Hammer

Riede

et al. 2023

Biomech Model Mechanobiol

View full text Add to dashboard Cite

show abstract

“…Spinal stability can be improved by intra-abdominal pressure (IAP) [10][11][12]. IAP can also reduce spinal loading [13]. Activation of the transversus abdominis muscle has been associated with IAP [14].…”

Section: Introductionmentioning

confidence: 99%

“…This means that the abdominal muscles work as in dynamic exercises, while the spine is loaded as in static exercises and maintains its neutral posture. The IAP can relieve the spine longitudinally to a considerable extent [13], so we assume that, despite the activity of the trunk extensor muscles, the pressure on the intervertebral discs is tolerable. The neutral posture of the spine distributes the load evenly among the vertebrae and intervertebral discs, reducing the risk of high local pressure [2] and injury [6].…”

Section: Introductionmentioning

confidence: 99%

Electromyographic Comparison of an Abdominal Rise on a Ball with a Traditional Crunch

Dolenec

Svetina

Strojnik

2022

Sensors

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We propose a new exercise, the abdominal rise on the ball, to replace the traditional crunch in exercise programs. The aim of this study is to compare the activity of the abdominal muscles when performing an ARB with the same activity when performing a traditional crunch. Twenty healthy adults participated in the study. Surface electromyography (EMG) was recorded from the upper and lower rectus abdominis (URA, LRA), internal oblique (IO), external oblique (EO), transversus abdominis (TrA), and erector spinae (ES). EMG values were normalized to maximal voluntary isometric contraction. A paired t-test, nonparametric Wilcoxon test and correlation coefficient were used for statistical analysis. The normalized EMG values of EO, TrA and ES, were statistically significantly higher during the abdominal rise on the ball compared to the traditional crunch, while URA, LRA and IO were significantly lower during the abdominal rise on the ball compared to the traditional crunch. TrA, EO and IO are sufficiently activated during an abdominal rise on a ball, so the exercise could be deemed effective for strengthening these muscles.

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A new method to design energy-conserving surrogate models for the coupled, nonlinear responses of intervertebral discs

Hammer,

Wenzel,

Santin

et al. 2024

Biomech Model Mechanobiol

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The aim of this study was to design physics-preserving and precise surrogate models of the nonlinear elastic behaviour of an intervertebral disc (IVD). Based on artificial force-displacement data sets from detailed finite element (FE) disc models, we used greedy kernel and polynomial approximations of second, third and fourth order to train surrogate models for the scalar force-torque -potential. Doing so, the resulting models of the elastic IVD responses ensured the conservation of mechanical energy through their structure. At the same time, they were capable of predicting disc forces in a physiological range of motion and for the coupling of all six degrees of freedom of an intervertebral joint. The performance of all surrogate models for a subject-specific L4$$\vert$$ | 5 disc geometry was evaluated both on training and test data obtained from uncoupled (one-dimensional), weakly coupled (two-dimensional), and random movement trajectories in the entire six-dimensional (6d) physiological displacement range, as well as on synthetic kinematic data. We observed highest precisions for the kernel surrogate followed by the fourth-order polynomial model. Both clearly outperformed the second-order polynomial model which is equivalent to the commonly used stiffness matrix in neuro-musculoskeletal simulations. Hence, the proposed model architectures have the potential to improve the accuracy and, therewith, validity of load predictions in neuro-musculoskeletal spine models.

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Embodiment of intra-abdominal pressure in a flexible multibody model of the trunk and the spinal unloading effects during static lifting tasks

Cited by 23 publications

References 96 publications

Effects of geometric individualisation of a human spine model on load sharing: neuro-musculoskeletal simulation reveals significant differences in ligament and muscle contribution

Effects of geometric individualisation of a human spine model on load sharing: neuro-musculoskeletal simulation reveals significant differences in ligament and muscle contribution

Electromyographic Comparison of an Abdominal Rise on a Ball with a Traditional Crunch

A new method to design energy-conserving surrogate models for the coupled, nonlinear responses of intervertebral discs

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