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Bibliografias temáticas / Muscle gearing

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Artigos de revistas

Literatura científica selecionada sobre o tema "Muscle gearing"

Autor: Grafiati

Publicado: 21 de janeiro de 2025

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Artigos de revistas sobre o assunto "Muscle gearing"

1

Eng, Carolyn M., and Thomas J. Roberts. "Aponeurosis influences the relationship between muscle gearing and force." Journal of Applied Physiology 125, no. 2 (2018): 513–19. http://dx.doi.org/10.1152/japplphysiol.00151.2018.

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Aponeuroses are connective tissues found on the surface of pennate muscles and are in close association with muscle fascicles. In addition to transmitting muscle forces to the external tendon, aponeurosis has been hypothesized to influence the direction of muscle shape change during a contraction. Muscle shape changes affect muscle contractile force and velocity because they influence the gear ratio with which muscle fascicles transmit force and velocity to the tendon. If aponeurosis modulates muscle shape changes, altering the aponeurosis’ radial integrity with incisions should alter gearing.

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2

Carrier, D. R., C. S. Gregersen, and N. A. Silverton. "Dynamic gearing in running dogs." Journal of Experimental Biology 201, no. 23 (1998): 3185–95. http://dx.doi.org/10.1242/jeb.201.23.3185.

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Dynamic gearing is a mechanism that has been suggested to enhance the performance of skeletal muscles by maintaining them at the shortening velocities that maximize their power or efficiency. We investigated this hypothesis in three domestic dogs during trotting and galloping. We used ground force recordings and kinematic analysis to calculate the changes in gear ratio that occur during the production of the external work of locomotion. We also monitored length changes of the vastus lateralis muscle, an extensor muscle of the knee, using sonomicrometry in four additional dogs to determine the

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3

Wakeling, James M., Ollie M. Blake, Iris Wong, Manku Rana, and Sabrina S. M. Lee. "Movement mechanics as a determinate of muscle structure, recruitment and coordination." Philosophical Transactions of the Royal Society B: Biological Sciences 366, no. 1570 (2011): 1554–64. http://dx.doi.org/10.1098/rstb.2010.0294.

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During muscle contractions, the muscle fascicles may shorten at a rate different from the muscle-tendon unit, and the ratio of these velocities is its gearing. Appropriate gearing allows fascicles to reduce their shortening velocities and allows them to operate at effective shortening velocities across a range of movements. Gearing of the muscle fascicles within the muscle belly is the result of rotations of the fascicles and bulging of the belly. Variable gearing can also occur as a result of tendon length changes that can be caused by changes in the relative timing of muscle activity for dif

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4

Wakeling, James M., Meghan Jackman, and Ana I. Namburete. "The Effect of External Compression on the Mechanics of Muscle Contraction." Journal of Applied Biomechanics 29, no. 3 (2013): 360–64. http://dx.doi.org/10.1123/jab.29.3.360.

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The velocity at which a muscle fascicle will shorten, and hence the force that it can develop, depends on its gearing within the muscle belly. Muscle fascicle length depends on both its pennation and the thickness of the muscle. It was expected that external compression would reduce the muscle thickness and pennation and thus cause a reduction to the gearing of the fascicles relative to the muscle belly. Structural properties of the medial gastrocnemius muscle were visualized using B-mode ultrasound in six subjects. Measurements were taken during cyclical isotonic contractions at three differe

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5

Wakeling, J. M., and I. A. Johnston. "White muscle strain in the common carp and red to white muscle gearing ratios in fish." Journal of Experimental Biology 202, no. 5 (1999): 521–28. http://dx.doi.org/10.1242/jeb.202.5.521.

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White muscle strains were recorded using sonomicrometry techniques for 70 fast-starts in the common carp Cyprinus carpio L. High-speed cine images were recorded simultaneously for 54 of these starts, and muscle strain was calculated independently from the digitized outlines of the fish. Sonomicrometry measurements of superficial muscle strain were not significantly different from the strain as calculated from the theory of simple bending of a homogeneous material: superficial muscle strain thus varied with chordwise distance from the spine. However, white muscle strain across a transverse sect

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6

Dick, Taylor J. M., and James M. Wakeling. "Shifting gears: dynamic muscle shape changes and force-velocity behavior in the medial gastrocnemius." Journal of Applied Physiology 123, no. 6 (2017): 1433–42. http://dx.doi.org/10.1152/japplphysiol.01050.2016.

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When muscles contract, they bulge in thickness or in width to maintain a (nearly) constant volume. These dynamic shape changes are tightly linked to the internal constraints placed on individual muscle fibers and play a key functional role in modulating the mechanical performance of skeletal muscle by increasing its range of operating velocities. Yet to date we have a limited understanding of the nature and functional implications of in vivo dynamic muscle shape change under submaximal conditions. This study determined how the in vivo changes in medial gastrocnemius (MG) fascicle velocity, pen

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7

Roberts, Thomas J., Carolyn M. Eng, David A. Sleboda, et al. "The Multi-Scale, Three-Dimensional Nature of Skeletal Muscle Contraction." Physiology 34, no. 6 (2019): 402–8. http://dx.doi.org/10.1152/physiol.00023.2019.

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Muscle contraction is a three-dimensional process, as anyone who has observed a bulging muscle knows. Recent studies suggest that the three-dimensional nature of muscle contraction influences its mechanical output. Shape changes and radial forces appear to be important across scales of organization. Muscle architectural gearing is an emerging example of this process.

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8

Eng, Carolyn M., Emanuel Azizi, and Thomas J. Roberts. "Structural Determinants of Muscle Gearing During Dynamic Contractions." Integrative and Comparative Biology 58, no. 2 (2018): 207–18. http://dx.doi.org/10.1093/icb/icy054.

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9

Wang, Yingjie, Chunbao Liu, Luquan Ren, and Lei Ren. "Load-dependent Variable Gearing Mechanism of Muscle-like Soft Actuator." Journal of Bionic Engineering 19, no. 1 (2021): 29–43. http://dx.doi.org/10.1007/s42235-021-00129-1.

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AbstractPennate muscle is characterized by muscle fibers that are oriented at a certain angle (pennation angle) relative to the muscle’s line of action and rotation during contraction. This fiber rotation amplifies the shortening velocity of muscle, to match loading conditions without any control system. This unique variable gearing mechanism, which characterized by Architecture Gear Ratio (AGR), is involves complex interaction among three key elements: muscle fibers, connective tissue, and the pennation angle. However, how three elements determine the AGR of muscle-like actuator is still unkn

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10

Wakeling, J. M., and I. A. Johnston. "Muscle power output limits fast-start performance in fish." Journal of Experimental Biology 201, no. 10 (1998): 1505–26. http://dx.doi.org/10.1242/jeb.201.10.1505.

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Fast-starts associated with escape responses were filmed at the median habitat temperatures of six teleost fish: Notothenia coriiceps and Notothenia rossii (Antarctica), Myoxocephalus scorpius (North Sea), Scorpaena notata and Serranus cabrilla (Mediterranean) and Paracirrhites forsteri (Indo-West-Pacific Ocean). Methods are presented for estimating the spine positions for silhouettes of swimming fish. These methods were used to validate techniques for calculating kinematics and muscle dynamics during fast-starts. The starts from all species show common patterns, with waves of body curvature t

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