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Journal articles on the topic 'Stiffness comparable'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

B., B. Konar. "Study of interactions between a novel elastomer and solvents." Journal of Indian Chemistry Society Vol. 78, October-December 2001 (2001): 757–59. https://doi.org/10.5281/zenodo.5898010.

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Department of Polymer Science & Technology, University of Calcutta, 92, A. P. C. Road, Kolkata-700 009, India <em>Manuscript received 31 August 2001</em> The flexibility parameters of chlorosulfonated polyethylene indicate chain stiffness comparable to other synthetic elastomers. Similar conclusion is also reached from a study of the hydrodynamic behavior. The Mark-Houwink constants, obtained from the molecular weight dependence of [<em>ŋ</em>] also indicate a fairly coiled up configuration for the molecular chain. The parameters characterizing the stiffness of the elastomer chain, such as

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2

Gardner, T. N., and M. Evans. "Relative stiffness, transverse displacement and dynamization in comparable external fixators." Clinical Biomechanics 7, no. 4 (1992): 231–39. http://dx.doi.org/10.1016/s0268-0033(92)90006-p.

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3

Schwarzenberg, P., T. Colding-Rasmussen, D. Hutchinson, et al. "LIGHT-CURABLE FRACTURE FIXATION SOLUTION COMPARABLE WITH METAL PLATES IN TORSION." Orthopaedic Proceedings 105-B, SUPP_7 (2023): 122. http://dx.doi.org/10.1302/1358-992x.2023.7.122.

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The objective of this study was to investigate how a new customizable light-curable osteosynthesis method (AdFix) compared to traditional metal hardware when loaded in torsion in an ovine phalanx model.Twenty-one ovine proximal phalanges were given a 3mm transverse osteotomy and four 1.5mm cortex screws were inserted bicortically on either side of the gap. The light-curable polymer composite was then applied using the method developed by Hutchinson [1] to create osteosyntheses in two groups, having either a narrow (6mm, N=9) or a wide (10mm, N=9) fixation patch. A final group (N=3) was fixated

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4

Hopkins, Justin, Nasser Heyrani, Christopher Kreulen, Tanya Garcia, Blaine Christiansen, and Eric Giza. "InternalBrace has Comparable Stiffness and Strength as Tightrope for Lisfranc Fixation." Foot & Ankle Orthopaedics 2, no. 3 (2017): 2473011417S0001. http://dx.doi.org/10.1177/2473011417s000196.

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Category: Sports, Biomechanics Introduction/Purpose: Lisfranc injuries are characterized by disruption between the medial cuneiform and base of the second metatarsal. Conventional interfragmentary screws decreases the amount of diastasis, however is believed to decrease the natural physiological movement of the joint compared to suture button (Tightrope, Arthrex, Inc., Naples, FL). The InternalBrace (IB, Arthrex, Inc., Naples, FL) allows physiologic movement and collagen ingrowth, while also decreasing iatrogenic bone loss. It also prevents erosion of the suture button into the medial cuneifor

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5

Roque, Reynaldo, William G. Buttlar, Byron E. Ruth, and Stephen W. Dickison. "Short-Loading-Time Stiffness from Creep, Resilient Modulus, and Strength Tests Using Superpave Indirect Tension Test." Transportation Research Record: Journal of the Transportation Research Board 1630, no. 1 (1998): 10–20. http://dx.doi.org/10.3141/1630-02.

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The Superpave indirect tension (IDT) system was modified to determine the short-loading-time stiffness of asphalt mixtures from resilient modulus, creep, and strength tests. The idea was not only to provide a more accurate method to determine the resilient modulus, but also to determine whether reasonable measures of short-loading-time stiffness could be obtained from tests that provide other properties and thereby minimize the amount of testing needed to characterize asphalt mixtures. It was found that even when evaluated at very short loading times, the stiffnesses determined from the differ

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6

Lehnhoff, T. F., Kwang Il Ko, and M. L. McKay. "Member Stiffness and Contact Pressure Distribution of Bolted Joints." Journal of Mechanical Design 116, no. 2 (1994): 550–57. http://dx.doi.org/10.1115/1.2919413.

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Member stiffnesses and the stress distributions in the bolts and members of bolted joints have been calculated for various bolt sizes, as well as thicknesses and materials of the members. The finite element method has been used to calculate the displacement and the stress distributions in the components of the bolted joint. Using axisymmetric elements, the bolted joint could be analyzed as a two-dimensional problem. Member stiffness ratios were calculated from the finite element results and compared with those calculated by a commonly used theory. The values were approximately comparable (16–3

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7

Deshmukh, S. N., and N. K. Chandiramani. "LQR Control of Wind Excited Benchmark Building Using Variable Stiffness Tuned Mass Damper." Shock and Vibration 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/156523.

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LQR control of wind induced motion of a benchmark building is considered. The building is fitted with a semiactive variable stiffness tuned mass damper adapted from the literature. The nominal stiffness of the device corresponds to the fundamental frequency of the building and is included in the system matrix. This results in a linear time-invariant system, for which the desired control force is computed using LQR control. The control force thus computed is then realized by varying the device stiffness around its nominal value by using a simple control law. A nonlinear static analysis is perfo

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8

Hartman, Curtis W., Nicholas C. Branting, Matthew A. Mormino, et al. "Unicortical Locking Screws Provide Comparable Rigidity to Bicortical Compression Screws in Tranverse Mid-Shaft Clavicle Fracture Plate Fixation Constructs." Clinics and Practice 15, no. 6 (2025): 101. https://doi.org/10.3390/clinpract15060101.

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Background: Mid-shaft clavicle fracture fixation carries neurovascular injury risk. The purpose of this study was to compare bicortical compression and unicortical locked clavicle plate constructs biomechanically. Materials and Methods: Ten fourth-generation composite transverse mid-shaft clavicle osteotomy specimens were assigned to two groups, and each clavicle was fixed with an eight-hole second-generation 3.5 mm pelvic reconstruction plate placed superiorly. Group one included five fixed with bicortical compression screws and group two included five fixed with unicortical locking screws. A

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9

O. Tang, T., and R. K.L. Su. "Shear and Flexural Stiffnesses of Reinforced Concrete Shear Walls Subjected to Cyclic Loading." Open Construction and Building Technology Journal 8, no. 1 (2014): 104–21. http://dx.doi.org/10.2174/1874836801408010104.

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Seismic analyses of concrete structures under maximum-considered earthquakes require the use of reduced stiffness accounting for cracks and degraded materials. Structural walls, different to other flexural dominated components, are sensitive to both shear and flexural stiffness degradations. Adoption of the gross shear stiffness for walls in seismic analysis prevails particularly for the design codes in the US. Yet available experimental results indicate that this could overstate the shear stiffness by more than double, which would hamper the actual predictions of building periods and shear lo

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10

Prager, Jon, Christopher F. Adams, Alexander M. Delaney, et al. "Stiffness-matched biomaterial implants for cell delivery: clinical, intraoperative ultrasound elastography provides a ‘target’ stiffness for hydrogel synthesis in spinal cord injury." Journal of Tissue Engineering 11 (January 2020): 204173142093480. http://dx.doi.org/10.1177/2041731420934806.

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Safe hydrogel delivery requires stiffness-matching with host tissues to avoid iatrogenic damage and reduce inflammatory reactions. Hydrogel-encapsulated cell delivery is a promising combinatorial approach to spinal cord injury therapy, but a lack of in vivo clinical spinal cord injury stiffness measurements is a barrier to their use in clinics. We demonstrate that ultrasound elastography – a non-invasive, clinically established tool – can be used to measure spinal cord stiffness intraoperatively in canines with spontaneous spinal cord injury. In line with recent experimental reports, our data

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11

Velasco-Guillen, Rodrigo J., Felix Schofer, Adna Bliek, and Philipp Beckerle. "Exploring the Just Noticeable Interaction Stiffness Differences of an Impedance-Controlled Series Elastic Actuator." Actuators 12, no. 10 (2023): 378. http://dx.doi.org/10.3390/act12100378.

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The integration of a passive elastic element in series between a motor and its load is popular in many human–robot interaction scenarios. By virtually imposing elastic behavior on the motor, an impedance control can act as a second stiffness to such an actuator. In this study, we investigated how participants perceived the different stiffness settings in a series elastic actuator by measuring the Just Noticeable Difference (JND) of the real stiffness of the elastic element and the virtual stiffness introduced by impedance control. We conducted a user study during which participants interacted

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Kohler, Felix Christian, Philipp Schenk, Theresa Nies, et al. "Fibula Nail versus Locking Plate Fixation—A Biomechanical Study." Journal of Clinical Medicine 12, no. 2 (2023): 698. http://dx.doi.org/10.3390/jcm12020698.

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In the treatment of ankle fractures, complications such as wound healing problems following open reduction and internal fixation are a major problem. An innovative alternative to this procedure offers a more minimally invasive nail stabilization. The purpose of this biomechanical study was to clarify whether this method was biomechanically comparable to the established method. First, the stability (range of motion, diastasis) and rotational stiffness of the native upper ankle were evaluated in eight pairs of native geriatric specimens. Subsequently, an unstable ankle fracture was created and f

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13

Möllensiep, Dennis, Timo Gorlas, Philipp Kulessa, and Bernd Kuhlenkötter. "Real-time stiffness compensation and force control of cooperating robots in robot-based double sided incremental sheet forming." Production Engineering 15, no. 5 (2021): 683–99. http://dx.doi.org/10.1007/s11740-021-01052-4.

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AbstractIn robot-based incremental sheet forming, the forming robot is displaced due to the forming forces and the comparable low stiffness. As the forming forces can not be predicted precisely, the stiffness needs to be compensated based on the measurement of a force torque sensor. While previous approaches used precalculated lookup tables, this publication presents a multi body system robot model that can calculate the displacement of the tool center point in real-time. In incremental sheet forming, the supporting robot is typically force controlled to bring superimposed stress into the form

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14

Petit, J., G. M. Filippi, F. Emonet-Denand, C. C. Hunt, and Y. Laporte. "Changes in muscle stiffness produced by motor units of different types in peroneus longus muscle of cat." Journal of Neurophysiology 63, no. 1 (1990): 190–97. http://dx.doi.org/10.1152/jn.1990.63.1.190.

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1. The effects of maximal tetanic contractions of varying numbers of motor units of the same type [slow (S), fast fatigue-resistant (FR), or fast fatigable (FF)] on the mechanical responses to muscle stretch were studied in the peroneus longus muscle of anesthetized cats. 2. Two types of stiffness measurements were made: 1) an average stiffness, defined as the tension change from the beginning to end of a 0.5-mm ramp stretch; and 2) a dynamic stiffness, defined as the ratio of peak-to-peak tension to amplitude of a maintained 85-microns sinusoidal stretch at frequencies of 10-80 Hz. 3. Contrac

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15

Maloney, Sean J., Iain M. Fletcher, and Joanna Richards. "Reliability of Unilateral Vertical Leg Stiffness Measures Assessed During Bilateral Hopping." Journal of Applied Biomechanics 31, no. 5 (2015): 285–91. http://dx.doi.org/10.1123/jab.2014-0254.

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The assessment of vertical leg stiffness is an important consideration given its relationship to performance. Vertical stiffness is most commonly assessed during a bilateral hopping task. The current study sought to determine the intersession reliability, quantified by the coefficient of variation, of vertical stiffness during bilateral hopping when assessed for the left and right limbs independently, which had not been previously investigated. On 4 separate occasions, 10 healthy males performed 30 unshod bilateral hops on a dual force plate system with data recorded independently for the left

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16

Turner, Anne T., Elizabeth G. Halsne, Joshua M. Caputo, et al. "Prosthetic forefoot and heel stiffness across consecutive foot stiffness categories and sizes." PLOS ONE 17, no. 5 (2022): e0268136. http://dx.doi.org/10.1371/journal.pone.0268136.

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Prosthetic foot stiffness plays a key role in the functional mobility of lower limb prosthesis users. However, limited objective data exists to guide selection of the optimal prosthetic foot stiffness category for a given individual. Clinicians often must rely solely on manufacturer recommendations, which are typically based on the intended user’s weight and general activity level. Availability of comparable forefoot and heel stiffness data would allow for a better understanding of differences between different commercial prosthetic feet, and also between feet of different stiffness categories

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17

Bagbag, A. A., B. M. Lehane, and J. P. Doherty. "Settlement of deep footings in reconstituted sand." Canadian Geotechnical Journal 56, no. 3 (2019): 449–59. http://dx.doi.org/10.1139/cgj-2017-0574.

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The paper examines methods for predicting the settlement of deep footings in reconstituted sand. Results from vertical load tests on deep circular plates within a laboratory pressure chamber are interpreted using data from triaxial tests, cone penetration tests (CPTs), and pressuremeter tests obtained for the same reconstituted sand. A simple nonlinear CPT-based relationship is shown to match the response observed in the plate tests and be consistent with finite element analyses as well as other comparable physical tests. The relationships between foundation stiffness and the sand’s small-stra

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18

Li, Xiaobo, Dudley A. Huber, Gregory L. Powell, Timothy L. White, and Gary F. Peter. "Breeding for improved growth and juvenile corewood stiffness in slash pine." Canadian Journal of Forest Research 37, no. 10 (2007): 1886–93. http://dx.doi.org/10.1139/x07-043.

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The importance of integrating measures of juvenile corewood mechanical properties, modulus of elasticity in particular, with growth and disease resistance in tree improvement programs has increased. We investigated the utility of in-tree velocity stiffness measurements to estimate the genetic control of corewood stiffness and to select for trees with superior growth and stiffness in a progeny trial of 139 families of slash pine, Pinus elliottii Engelm. grown on six sites. Narrow-sense heritability estimates across all six sites for in-tree acoustic velocity stiffness at 8 years (0.42) were hig

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19

Karoli, N. A., O. T. Zarmanbetova, and A. P. Rebrov. "AMBULATORY ARTERIAL STIFFNESS MONITORING IN PATIENTS WITH ASTHMA." Russian Archives of Internal Medicine 9, no. 4 (2019): 301–7. http://dx.doi.org/10.20514/2226-6704-2019-9-4-301-307.

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Cardiovascular disease is one of the major causes of death throughout the world. Early detection of target organ damage is important for more successful prevention of cardiovascular diseases and improvement of patient outcomes. One of these target organs is the vascular wall, and its damage consists in loss of elastic properties and increase in stiffness. Many studies have shown that the increasing stiffness of the vascular wall is an independent predictor of cardiovascular risk. Objective: To evaluate parameters of the ambulatory arterial stiffness monitoring in patients with bronchial asthma

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20

Sibakin, D. D., E. G. Solodkova, and S. V. Balalin. "Corneal biomechanical properties in norm and in progressive keratoconus." Modern technologies in ophtalmology, no. 4 (September 29, 2023): 144–51. http://dx.doi.org/10.25276/2312-4911-2023-4-144-151.

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A prospective study of corneal stiffness parameter of 173 eyes of 173 healthy subjects with different refractions as well as 41 eyes with keratoconus was carried out. The study groups were comparable in age and gender composition. Correlation was performed between corneal stiffness parameter (Stiffness Parameter (SP-A1), minimum corneal thickness (MCT) and biomechanically compensated intraocular pressure (bIOP) determined using Pentacam HR and Corvis ST (OCULUS, Germany), as well as the anteroposterior chamber (APC) value and patient age. Based on multivariate regression analysis, the correlat

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21

Khachatryan, A. V., L. N. Nekrutenko, and L. M. Vasilets. "ARTERIAL STIFFNESS IN YOUNG PATIENTS WITH CHRONIC GLOMERULONEPHRITIS." Perm Medical Journal 35, no. 1 (2018): 33–37. http://dx.doi.org/10.17816/pmj35133-37.

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Aim. To study the presence of the phenomenon of stiffness of the arterial vessels in young patients with chronic glomerulonephritis. Materials and methods. The parameters of malleolar-brachial index (while chronic kidney disease (CKD) progression) were studied in 47 young patients with chronic glomerulonephritis and 24 comparable by age healthy volunteers. Results. There was detected the elevation of malleolar-brachial index in young patients with chronic glomerulonephritis, when having stage 3-5 CKD. Conclusions. Malleolar-brachial index, as an index of arterial stiffness, grows with CKD prog

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22

Harb, Afif, Bastian Welke, Emmanouil Liodakis, et al. "Biomechanical Assessment of Three Osteosynthesis Constructs by Periprosthetic Humerus Fractures." Advances in Orthopedics 2020 (October 26, 2020): 1–7. http://dx.doi.org/10.1155/2020/8872419.

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Background. Biomechanical stability assessment of 3 different constructs for proximal fixation of a locking compression plate (LCP) in treating a Worland type C periprosthetic fracture after total shoulder arthroplasty. Methods. 27 Worland type C fractures after shoulder arthroplasty in synthetic humeri were treated with 14-hole LCP that is proximally fixed using the following: (1) 1 × 1.5 mm cerclage wires and 2x unicortical-locking screws, (2) 3 × 1.5 mm cerclage wires, or (3) 2x bicortical-locking attachment plates. Torsional stiffness was assessed by applying an internal rotation moment of

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Staszak, Natalia, Tomasz Gajewski, and Tomasz Garbowski. "Shell-to-Beam Numerical Homogenization of 3D Thin-Walled Perforated Beams." Materials 15, no. 5 (2022): 1827. http://dx.doi.org/10.3390/ma15051827.

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Determining the geometric characteristics of even complex cross-sections of steel beams is not a major challenge nowadays. The problem arises when openings of various shapes and sizes appear at more or less regular intervals along the length of the beam. Such alternations cause the beam to have different stiffnesses along its length. It has different bending and shear stiffnesses at the opening point and in the full section. In this paper, we present a very convenient and easy-to-implement method of determining the equivalent stiffness of a beam with any cross-section (open or closed) and with

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24

Huynh, Lana T., Stephanie N. Bonvicini, Arthur C. Pinon, and Simon Trudel. "Nanocrystalline alloys: synthesis and characterization of non-stoichiometric Co2FeAl nanocrystals." Canadian Journal of Chemistry 94, no. 4 (2016): 367–72. http://dx.doi.org/10.1139/cjc-2015-0352.

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Non-stoichiometric Co2FeAl nanoparticles are formed by the in-solution thermal decomposition of the corresponding metal acetylacetonate complexes in the presence of capping ligands followed by reduction of the obtained material under an H2-containing atmosphere. Transmission electron microscopy indicates that sub-100 nm nanoparticles are obtained, with reasonable size control. Magnetic measurements indicate that the saturation magnetization, Bloch behavior, magnetization reversal, spin-wave stiffness, and exchange stiffness are all comparable to those observed for bulk and thin-film Co2FeAl, i

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25

Roy, Anindo, Hermano I. Krebs, Christopher T. Bever, Larry W. Forrester, Richard F. Macko, and Neville Hogan. "Measurement of passive ankle stiffness in subjects with chronic hemiparesis using a novel ankle robot." Journal of Neurophysiology 105, no. 5 (2011): 2132–49. http://dx.doi.org/10.1152/jn.01014.2010.

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Our objective in this study was to assess passive mechanical stiffness in the ankle of chronic hemiparetic stroke survivors and to compare it with those of healthy young and older (age-matched) individuals. Given the importance of the ankle during locomotion, an accurate estimate of passive ankle stiffness would be valuable for locomotor rehabilitation, potentially providing a measure of recovery and a quantitative basis to design treatment protocols. Using a novel ankle robot, we characterized passive ankle stiffness both in sagittal and in frontal planes by applying perturbations to the ankl

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Solodkova, Elena G., Sergey V. Balalin, and Viktor P. Fokin. "The influence of different factors on corneal biomechanical properties in norm and in progressive keratoconus." Journal of Volgograd State Medical University 20, no. 1 (2023): 38–45. http://dx.doi.org/10.19163/1994-9480-2023-20-1-38-45.

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A prospective study of corneal stiffness parameter of 174 eyes of 174 healthy subjects with different refractions as well as 56 eyes with keratoconus was carried out. The study groups were comparable in age and gender composition. Correlation was performed between corneal stiffness parameter (Stiffness Parameter (SP-A1), minimum corneal thickness (MCT) and biomechanically compensated intraocular pressure (bIOP) determined using Pentacam HR and Corvis ST (OCULUS, Germany), as well as the anteroposterior chamber (APC) value and patient age. Based on multivariate regression analysis, the correlat

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27

Michalek, Arthur J., Guy G. Kennedy, David M. Warshaw, and M. Yusuf Ali. "Flexural Stiffness of Myosin Va Subdomains as Measured from Tethered Particle Motion." Journal of Biophysics 2015 (November 30, 2015): 1–9. http://dx.doi.org/10.1155/2015/465693.

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Myosin Va (MyoVa) is a processive molecular motor involved in intracellular cargo transport on the actin cytoskeleton. The motor’s processivity and ability to navigate actin intersections are believed to be governed by the stiffness of various parts of the motor’s structure. Specifically, changes in calcium may regulate motor processivity by altering the motor’s lever arm stiffness and thus its interhead communication. In order to measure the flexural stiffness of MyoVa subdomains, we use tethered particle microscopy, which relates the Brownian motion of fluorescent quantum dots, which are att

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28

Zheng, Kaiqi, Siyuan Zhou, Yaohui Zhang, et al. "Simplified Evaluation of Shear Stiffness Degradation of Diagonally Cracked Reinforced Concrete Beams." Materials 16, no. 13 (2023): 4752. http://dx.doi.org/10.3390/ma16134752.

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Shear cracking in concrete box-girder bridges, which could cause excessive deflection during the serviceability limit state, cannot be effectively avoided by code-guided design. While elastic shear deformation only accounts for a small proportion of total deformation for un-cracked reinforced concrete (RC) beams, the magnitude of after-cracking shear deformation becomes comparable to flexural deformation for RC beams. However, there is still a lack of practical models to predict the after-cracking shear deformation of RC beams. First, six thin-webbed I beams were tested to investigate the shea

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29

Borden, Peter, John Nyland, David N. M. Caborn, and David Pienkowski. "Biomechanical Comparison of the FasT-Fix Meniscal Repair Suture System with Vertical Mattress Sutures and Meniscus Arrows." American Journal of Sports Medicine 31, no. 3 (2003): 374–78. http://dx.doi.org/10.1177/03635465030310030801.

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Background A meniscal repair technique that combines the strength of vertical mattress sutures and the decreased tissue morbidity of an all-inside technique would be advantageous. Hypothesis The FasT-Fix Meniscal Repair Suture System will provide load at failure, stiffness, and displacement equivalent to that of vertical mattress sutures and superior to that of Meniscus Arrows. Study Design In vitro biomechanical study. Methods After repair of a 2-cm vertical longitudinal medial meniscal lesion, three groups of six human cadaveric knees were biomechanically tested in a random order on a servoh

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30

Woodfield, T., J. Shum, W. Linkhorn, et al. "GOING LOW: LOW MODULUS GRAFT-FREE 3D-PRINTED TITANIUM INTERBODY CAGES SHOW COMPARABLE BONE FORMATION TO PEEK WITH GRAFT." Orthopaedic Proceedings 105-B, SUPP_3 (2023): 99. http://dx.doi.org/10.1302/1358-992x.2023.3.099.

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Polyetheretherketone (PEEK) interbody fusion cages combined with autologous bone graft is the current clinical gold standard treatment for spinal fusion, however, bone graft harvest increases surgical time, risk of infection and chronic pain. We describe novel low-stiffness 3D Printed titanium interbody cages without autologous bone graft and assessed their biological performance in a pre-clinical in vivo interbody fusion model in comparison to the gold standard, PEEK with graft.Titanium interbody spacers were 3D Printed with a microporous (Ti1: <1000μm) and macroporous (Ti2: >1000μm) de

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DeTora, M., and K. Kraus. "Mechanical testing of 3.5 mm locking and non-locking bone plates." Veterinary and Comparative Orthopaedics and Traumatology 21, no. 04 (2008): 318–22. http://dx.doi.org/10.3415/vcot-07-04-0034.

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SummaryLocking plate technologies are being developed in order to provide the surgeon with advantages over previous bone plate systems (both locking and non-locking). Locking plate systems possess inherent biological advantages in fracture fixation by preserving the periosteal blood supply, serving as internal fixators. It is important to consider the strength of each orthopaedic implant as an important selection criterion while utilizing the reported advantages of locking plate systems to prevent catastrophic fracture failure. Mechanical testing of orthopaedic implants is a common method used

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32

Zhang, Li-Qun, Sun G. Chung, Yupeng Ren, Lin Liu, Elliot J. Roth, and W. Zev Rymer. "Simultaneous characterizations of reflex and nonreflex dynamic and static changes in spastic hemiparesis." Journal of Neurophysiology 110, no. 2 (2013): 418–30. http://dx.doi.org/10.1152/jn.00573.2012.

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This study characterizes tonic and phasic stretch reflex and stiffness and viscosity changes associated with spastic hemiparesis. Perturbations were applied to the ankle of 27 hemiparetic and 36 healthy subjects under relaxed or active contracting conditions. A nonlinear delay differential equation model characterized phasic and tonic stretch reflex gains, elastic stiffness, and viscous damping. Tendon reflex was characterized with reflex gain and threshold. Reflexively, tonic reflex gain was increased in spastic ankles at rest ( P < 0.038) and was not regulated with muscle contraction, ind

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Chendey, T. V., Ye S. Sirchak, and V. I. Chendey. "Arterial stiffness in non-alcoholic fatty liver disease." GASTROENTEROLOGY 58, no. 2 (2024): 109–13. http://dx.doi.org/10.22141/2308-2097.58.2.2024.603.

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Background. The presence of metabolic-associated pathology, namely obesity, diabetes mellitus, dyslipidemia, and non-alcoholic fatty liver disease (NAFLD), significantly accelerates the development of the cardiovascular continuum. This is associated with an increased risk of major cardiovascular events (myocardial infarction, stroke). An important organ damage in hypertension (HTN) is the remodeling of small arteries and an increase in stiffness of large arteries. The relationship between NAFLD, dyslipidemia, hypertriglyceridemia, obesity (especially abdominal), diabetes, and HTN is well studi

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Mahmud, A., and J. Feely. "Reduction in arterial stiffness with angiotensin II antagonist is comparable with and additive to ACE inhibition." American Journal of Hypertension 15, no. 4 (2002): 321–25. http://dx.doi.org/10.1016/s0895-7061(01)02313-5.

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O’Malley, Marcia K., and Gina Upperman. "A Study of Perceptual Performance in Haptic Virtual Environments." Journal of Robotics and Mechatronics 18, no. 4 (2006): 467–75. http://dx.doi.org/10.20965/jrm.2006.p0467.

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The performance levels of human subjects in size identification and size discrimination experiments in both real and virtual environments are presented. The virtual environments are displayed with a PHANToM desktop three degree-of-freedom haptic interface. Results indicate that performance of the size identification and size discrimination tasks in the virtual environment is comparable to that in the real environment, implying that the haptic device does a good job of simulating reality for these tasks. Additionally, performance in the virtual environment was measured at below maximum machine

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Römer, Claudia, Enrico Zessin, Julia Czupajllo, Thomas Fischer, Bernd Wolfarth, and Markus Herbert Lerchbaumer. "Effect of Physical Parameters and Training Load on Patellar Tendon Stiffness in Professional Athletes." Diagnostics 13, no. 15 (2023): 2541. http://dx.doi.org/10.3390/diagnostics13152541.

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Background: Injuries of the patellar tendon commonly occur as a result of mechanical loading of the tendon during physical activity. Shear wave elastography (SWE) is an established technique for assessing tendon stiffness, and has good interindividual reliability. The aim of this study was to investigate the impacts of physical parameters and different sports on patellar tendon stiffness in professional athletes using SWE. Methods: Standardized patellar tendon SWE was performed in a relaxed supine position with a small roll under the knee (20° flexion) in 60 healthy professional athletes (30 f

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Karkosch, Roman Frederik, Michael Schwarze, Tomas Smith, Maximilian Petri, Marc-Frederic Pastor, and Hauke Horstmann. "Medial open wedge osteotomy yields comparable stability to lateral open wedge procedure on the distal femur." PLOS ONE 19, no. 9 (2024): e0310869. http://dx.doi.org/10.1371/journal.pone.0310869.

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Background Supracondylar osteotomies are a frequently and successfully used technique in the treatment of coronal plane deformities and unicompartmental osteoarthritis of the knee. While lateral open wedge techniques are common for valgus deformities, the data about medial open wedge techniques for varus deformities is sparse. The aim of this study was to compare the biomechanical properties of medial and lateral open wedge osteotomies using a locking Tomofix® plate (DePuy Synthes, Oberdorf, Switzerland). Our hypothesis was that there would be no difference regarding biomechanical outcome para

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Yin Wei, Chris Chan, Sem Sei Haw, Elrofai Suliman Bashir, Saw Lim Beng, Rukmanikanthan Shanmugam, and Kwan Mun Keong. "Biomechanical comparison between cortical screw–rod construct versus pedicle screw–rod construct in transforaminal lumbar interbody fusion." Journal of Orthopaedic Surgery 25, no. 1 (2017): 230949901769065. http://dx.doi.org/10.1177/2309499017690656.

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Objective: To compare construct stiffness of cortical screw (CS)-rod transforaminal lumbar interbody fusion (TLIF) construct (G2) versus pedicle screw (PS)-rod TLIF construct (G1) in the standardized porcine lumbar spine. Methods: Six porcine lumbar spines (L2–L5) were separated into 12 functional spine units. Bilateral total facetectomies and interlaminar decompression were performed for all specimens. Non-destructive loading to assess stiffness in lateral bending, flexion and extension as well as axial rotation was performed using a universal material testing machine. Results: PS and CS cons

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Huyghues-Despointes, Clotilde M. J. I., Timothy C. Cope, and T. Richard Nichols. "Intrinsic Properties and Reflex Compensation in Reinnervated Triceps Surae Muscles of the Cat: Effect of Activation Level." Journal of Neurophysiology 90, no. 3 (2003): 1537–46. http://dx.doi.org/10.1152/jn.00718.2002.

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The manner in which activation levels influence intrinsic muscular properties and contributions of the stretch reflex were studied in homogeneous soleus (SOL) and heterogeneous gastrocnemius (G) muscles in the decerebrate cat. Intrinsic mechanical properties were represented by the initial stiffness of the muscle, measured prior to reflex action, and by the tendency of the muscle to yield during stretch in the absence of the stretch reflex. Stiffness regulation by the stretch reflex was evaluated by measuring the extent to which reflex action reduces yielding and the extent to which stiffness

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Khomkamon, Nitchada. "ARTERIAL STIFFNESS DETERMINED BY CARDIO-ANKLE VASCULAR INDEX IN PATIENTS WITH FAMILIAL HYPERCHOLESTEROLEMIA." Journal of the ASEAN Federation of Endocrine Societies 38, S3 (2023): 83. https://doi.org/10.15605/jafes.038.afes.130.

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INTRODUCTIONMeasurement of arterial stiffness is recommended for enhancing cardiovascular risk stratification, especially in high CV risk patients with familial hypercholesterolemia (FH). Therefore, early detection of arterial stiffness in FH patients with no established atherosclerotic cardiovascular disease is a rationale strategy. Cardio-ankle vascular index (CAVI) is generally used as a tool to measure arterial stiffness. However, there are few studies about arterial stiffness measurement in patients with FH. This study aims to compare arterial stiffness between patients with dyslipidemia

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Gunst, S. J., R. A. Meiss, M. F. Wu, and M. Rowe. "Mechanisms for the mechanical plasticity of tracheal smooth muscle." American Journal of Physiology-Cell Physiology 268, no. 5 (1995): C1267—C1276. http://dx.doi.org/10.1152/ajpcell.1995.268.5.c1267.

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In smooth muscle tissues, the relationship between muscle or cell length and active force can be modulated by altering the cell or tissue length during stimulation. Mechanisms for this mechanical plasticity were investigated by measuring muscle stiffness during isometric contractions in which contractile force was graded by changing stimulus intensity or muscle length. Stiffness was significantly higher in contracted than in resting muscles at comparable forces; however, the relationship between stiffness and force during force development was curvilinear and independent of muscle length and s

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Palkowski, Heinz, and Adele Carradò. "Metal-Polymer-Metal Laminates for Lightweight Application." Key Engineering Materials 684 (February 2016): 323–34. http://dx.doi.org/10.4028/www.scientific.net/kem.684.323.

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In the last decade, wide research was carried out on developing light-weight materials with improved mechanical properties, for instance comparable specific stiffness and strength, improved isolation, superior vibration and sound damping properties. To satisfy the increasing demands, Metal-Polymer-Metal Laminates have been numerously developed. Here, a short background of composites structures is presented.

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Valdoz, Jonard Corpuz, Dallin J. Jacobs, Collin G. Cribbs, et al. "An Improved Scalable Hydrogel Dish for Spheroid Culture." Life 11, no. 6 (2021): 517. http://dx.doi.org/10.3390/life11060517.

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Research in fields studying cellular response to surface tension and mechanical forces necessitate cell culture tools with tunability of substrate stiffness. We created a scalable hydrogel dish design to facilitate scaffold-free formation of multiple spheroids in a single dish. Our novel design features inner and outer walls, allowing efficient media changes and downstream experiments. The design is easily scalable, accommodating varying numbers of microwells per plate. We report that non-adherent hydrogel stiffness affects spheroid morphology and compaction. We found that spheroid morphology

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Salles Rosa Neto, Nilton, Maurício Levy-Neto, Elaine Cristina Tolezani, Eloísa Bonfá, Luiz Aparecido Bortolotto, and Rosa Maria Rodrigues Pereira. "Determinants of Arterial Stiffness in Female Patients with Takayasu Arteritis." Journal of Rheumatology 41, no. 7 (2014): 1374–78. http://dx.doi.org/10.3899/jrheum.131110.

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Objective.The assessment of pulse wave velocity (PWV) in Takayasu arteritis (TA) is complex because of many confounding factors. We evaluated PWV in female patients with TA and controls with comparable anthropometric and clinical variables and assessed a possible association of TA with disease variables.Methods.We evaluated 27 patients with TA consecutively. Exclusion criteria were menopause, smoking, diabetes, renal insufficiency, poorly controlled hypertension, cardiac arrhythmias, obesity, inflammatory comorbidities, pregnancy, and surgical procedures involving the aorta. Disease activity w

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Steck, Patrick, Dominik Schuler, Christian Witzgall, and Sandro Wartzack. "A New Slicer-Based Method to Generate Infill Inspired by Sandwich-Patterns for Reduced Material Consumption." Materials 17, no. 22 (2024): 5596. http://dx.doi.org/10.3390/ma17225596.

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This work presents a novel infill method for additive manufacturing, specifically designed to optimize material use and enhance stiffness in fused filament fabrication (FFF) parts through a geometry-aware, corrugated design inspired by sandwich structures. Unlike standard infill patterns, which typically employ uniform, space-filling grids that often disregard load-specific requirements, this method generates a cavity inside the component to be printed and fill the space between inner and outer contours with continuous, adaptable extrusion paths. This design enables consistent support and impr

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Frigg, Arno, Sandrine Zaugg, Gerardo Maquieira, and Alex Pellegrino. "Stiffness and Range of Motion After Minimally Invasive Chevron-Akin and Open Scarf-Akin Procedures." Foot & Ankle International 40, no. 5 (2019): 515–25. http://dx.doi.org/10.1177/1071100718818577.

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Background: Stiffness after open hallux valgus surgery affects 7% to 38% of patients. Minimally invasive surgery (MIS) is thought to decrease this rate by reducing soft tissue trauma. MIS, now in its third generation, is advertised as delivering results superior to open surgery. However, no studies have reported stiffness or range of motion (ROM). Methods: Between January 2014 and December 2015, a total of 50 patients received open scarf-Akin surgery and 48 received minimally invasive Chevron Akin (MICA) surgery. The endpoints were American Orthopaedic Foot & Ankle Society (AOFAS) score, r

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Chi, Pei, Wenlong Tian, Tong Guo, Dafu Cao, and Jun Dong. "Parametric Study on the Seismic Response of Steel-Framed Buildings with Self-Centering Tension-Only Braces." Advances in Civil Engineering 2019 (August 25, 2019): 1–17. http://dx.doi.org/10.1155/2019/9204362.

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Self-centering bracing systems, by which residual deformations of structures after earthquakes can be minimized, are considered effective solutions to achieve seismic resilience. In this paper, a parametric study on the seismic response of intermediate and high-rise steel-framed buildings with novel self-centering tension-only braces (SC-TOBs) is numerically conducted. Three key parameters, the stiffness degradation factor, the activation strain, and the initial axial stiffness of the SC-TOBs, are investigated to explore the design space for the SC-TOB frames (SC-TOBFs) because of their unique

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Iyama, J., O. Chih-Chun, and K. Araki. "Bending moment distribution estimation of an actual steel building structure by microstrain measurement under small earthquakes." Journal of Civil Structural Health Monitoring 11, no. 3 (2021): 791–807. http://dx.doi.org/10.1007/s13349-021-00482-z.

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AbstractMost structural health monitoring systems estimate the overall behavior by measuring the acceleration response, which cannot directly measure the stress or damage state of individual structural members. An alternative approach is to use strain measurements; however, methods for analyzing and utilizing strain data for actual steel buildings have not been established. In this study, highly precise semiconductor strain gauges were applied to an actual building. The accelerations and strains measured during earthquake loading were used to calculate the ratio of the bending moment at the be

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Shibata, Shigeki, and Benjamin D. Levine. "Biological aortic age derived from the arterial pressure waveform." Journal of Applied Physiology 110, no. 4 (2011): 981–87. http://dx.doi.org/10.1152/japplphysiol.01261.2010.

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Indexes for arterial stiffness are, by their nature, influenced by the ambient blood pressure due to the curvilinear nature of arterial compliance. We developed a new concept of the “Modelflow aortic age,” which is, theoretically, not influenced by the ambient blood pressure and provides an easily understood context (biological vs. chronological age) for measures of arterial stiffness. The purpose of the present study was to validate this pressure-independent index for aortic stiffness in humans. Twelve sedentary elderly (65–77 yr), 11 Masters athletes (65–73 yr), and 12 sedentary young indivi

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Darainy, Mohammad, Farzad Towhidkhah, and David J. Ostry. "Control of Hand Impedance Under Static Conditions and During Reaching Movement." Journal of Neurophysiology 97, no. 4 (2007): 2676–85. http://dx.doi.org/10.1152/jn.01081.2006.

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It is known that humans can modify the impedance of the musculoskeletal periphery, but the extent of this modification is uncertain. Previous studies on impedance control under static conditions indicate a limited ability to modify impedance, whereas studies of impedance control during reaching in unstable environments suggest a greater range of impedance modification. As a first step in accounting for this difference, we quantified the extent to which stiffness changes from posture to movement even when there are no destabilizing forces. Hand stiffness was estimated under static conditions an

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