Results 1 to 10 of about 21,635 (75)

The energy of muscle contraction. II. Transverse compression and work [PDF]

, 2020
In this study we reproduced this compression-induced reduction in muscle force through the use of a three-dimensional finite element model of contracting muscle. The model used the principle of minimum total energy and allowed for the redistribution of energy through different strain energy-densities; this allowed us to determine the importance of the ...
arxiv   +1 more source

3D Quasi-Static Ultrasound Elastography With Plane Wave In Vivo [PDF]

IEEE Transactions on Medical Imaging, 2017, 36 (2), pp.357-365, 2023
In biological tissue, an increase in elasticity is often a marker of abnormalities. Techniques such as quasi-static ultrasound elastography have been developed to assess the strain distribution in soft tissues in two dimensions using a quasi-static compression.
arxiv   +1 more source

Activation of a muscle as a mapping of stress-strain curves [PDF]

Extreme Mechanics Letters 28 (2019): 37-42, 2019
The mathematical modeling of the contraction of a muscle is a crucial problem in biomechanics. Several different models of muscle activation exist in literature. A possible approach to contractility is the so-called active strain: it is based on a multiplicative decomposition of the deformation gradient into an active contribution, accounting for the ...
arxiv   +1 more source

The energy of muscle contraction. I. Tissue force and deformation during isometric contractions [PDF]

, 2020
During contraction the energy of muscle tissue increases due to energy from the hydrolysis of ATP. This energy is distributed across the tissue as strain-energy potentials in the contractile elements, strain-energy potential from the 3D deformation of the base-material tissue (containing cellular and ECM effects), energy related to changes in the ...
arxiv   +1 more source

Investigating the Correlation between Force Output, Strains, and Pressure for Active Skeletal Muscle Contractions [PDF]

arXiv, 2023
Experimental observations suggest that the force output of the skeletal muscle tissue can be correlated to the intra-muscular pressure generated by the muscle belly. However, pressure often proves difficult to measure through in-vivo tests. Simulations on the other hand, offer a tool to model muscle contractions and analyze the relationship between ...
arxiv  

Low Voltage Electrohydraulic Actuators for Untethered Robotics [PDF]

, 2023
Rigid robots can be precise in repetitive tasks, but struggle in unstructured environments. Nature's versatility in such environments inspires researchers to develop biomimetic robots that incorporate compliant and contracting artificial muscles. Among the recently proposed artificial muscle technologies, electrohydraulic actuators are promising since ...
arxiv   +1 more source

Dynamic MR imaging of the skeletal muscle in young and senior volunteers during minimal synchronized neuromuscular electrical stimulation [PDF]

, 2020
$\textbf{Object}$ Neuromuscular electrical stimulation (NMES)-induced isometric contraction is feasible during MRI and can be combined with acquisition of volumetric dynamic MR data, in a synchronous and controlled way. Since NMES is a potent resource for rehabilitation, MRI synchronized with NMES presents a valuable validation tool.
arxiv   +1 more source

Stretching graphene using polymeric micro-muscles [PDF]

Colangelo F. et al., 2D Materials, 5 045032 (2018), 2017
The control of strain in two-dimensional materials opens exciting perspectives for the engineering of their electronic properties. While this expectation has been validated by artificial-lattice studies, it remains elusive in the case of atomic lattices.
arxiv   +1 more source

More than energy cost: Multiple benefits of the long Achilles tendon in human walking and running [PDF]

arXiv, 2022
Elastic strain energy is stored and released from long, distal tendons such as the Achilles during locomotion, reducing locomotor energy cost by minimising muscle shortening distance and speed, and thus activation. However, numerous additional, often unrecognised, advantages of long tendons may speculatively be of greater evolutionary advantage ...
arxiv  

A continuum model of skeletal muscle tissue with loss of activation [PDF]

, 2017
We present a continuum model for the mechanical behavior of the skeletal muscle tissue when its functionality is reduced due to aging. The loss of ability of activating is typical of the geriatric syndrome called sarcopenia. The material is described by a hyperelastic, polyconvex, transverse isotropic strain energy function.
arxiv   +1 more source