keyword
MENU ▼
Read by QxMD icon Read
search

"Tendon stiffness"

keyword
https://www.readbyqxmd.com/read/27863739/the-influence-of-testing-angle-on-the-biomechanical-properties-of-the-rat-supraspinatus-tendon
#1
Michael D Newton, Abigail A Davidson, Ryan Pomajzl, Joseph Seta, Michael D Kurdziel, Tristan Maerz
Rotator cuff tears are a common shoulder pathology. The rat supraspinatus tendon model is commonly employed for preclinical assessment of rotator cuff pathology or regeneration. However, there is a lack of a standardized biomechanical testing protocol; previous studies have tested the tendon at abduction angles ranging from -15° to 90°. This study aimed to assess the effect of abduction/testing angle on the biomechanical properties of the rat supraspinatus tendon. Fourty-eight shoulders (n=12/group) from healthy Sprague-Dawley rats were randomized to 4 testing angle groups: 0° (corresponding to 90° abduction), 30°, 60°, and 90° (0° abduction)...
November 9, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27824567/shear-wave-measurements-for-evaluation-of-tendon-diseases
#2
Chia-Lun Yeh, Po-Ling Kuo, Jean-Luc Gennisson, Javier Brum, Mickael Tanter, Pai-Chi Li
This paper investigated the feasibility of using supersonic shear wave measurements to quantitatively differentiate normal and damaged tendons based on their mechanical properties. Five freshly harvested porcine tendons excised from pig legs were used. Tendon damage was induced by incubating the tendons with a 1% w/v collagenase solution. Values of shear modulus were derived both by a time-of-flight (TOF) approach and a transverse isotropic plate model (TI-model). The results show that as the preload applied to the tendon increased from 0 to 3 N, the mean shear modulus derived based on the TOF approach, the TI-model, and Young's modulus estimated from mechanical testing increased from 14...
November 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27768508/asynchronous-alterations-of-muscle-force-and-tendon-stiffness-following-8-week-resistance-exercise-with-whole-body-vibration-in-older-women
#3
Seong-Won Han, Dae-Yeon Lee, Dong-Sung Choi, Boram Han, Jin-Sun Kim, Hae-Dong Lee
This study aimed to examine whether muscle force and tendon stiffness in a muscle -tendon complex alter synchronously following 8-week whole-body vibration (WBV) training in older people. Forty older women aged 65 years and older, were randomly assigned into Control (CON, n=15) and WBV training groups (Exposure Time (ET, n=13) and Vibration Intensity (VI, n=12)). For the training groups, 4-week detraining period was subjected following the training period. Throughout the training/detraining period, force of the medial gastrocnemius (MG) muscle and stiffness of the Achilles tendon were assessed 4 times (0, 4, 8, and 12-week) using a combined system of dynamometer and ultrasonography...
October 21, 2016: Journal of Aging and Physical Activity
https://www.readbyqxmd.com/read/27747846/human-tendon-adaptation-in-response-to-mechanical-loading-a-systematic-review-and-meta-analysis-of-exercise-intervention-studies-on-healthy-adults
#4
Sebastian Bohm, Falk Mersmann, Adamantios Arampatzis
BACKGROUND: The present article systematically reviews recent literature on the in vivo adaptation of asymptomatic human tendons following increased chronic mechanical loading, and meta-analyzes the loading conditions, intervention outcomes, as well as methodological aspects. METHODS: The search was performed in the databases PubMed, Web of Knowledge, and Scopus as well as in the reference lists of the eligible articles. A study was included if it conducted (a) a longitudinal exercise intervention (≥8 weeks) on (b) healthy humans (18 to 50 years), (c) investigating the effects on mechanical (i...
December 2015: Sports Medicine—Open
https://www.readbyqxmd.com/read/27717059/human-col5a1-polymorphisms-and-quadriceps-muscle-tendon-mechanical-stiffness-in-vivo
#5
Eric A Kirk, Colin W Moore, Eric J Chater-Diehl, Shiva M Singh, Charles L Rice
What is the central question of the study? Do COL5A1 gene variants, previously reported to have diminished transcript stability, manifest in physiological phenotypes of quadriceps muscle-tendon contractile properties and mechanical stiffness in humans? What is the main finding and its importance? COL5A1 gene variants influence mechanical stiffness, not seeming to affect low-level contractile properties in humans. Functional differences in COL5A1 manifest during moderate- to high-level contractions. Polymorphisms of the collagen type V alpha 1 chain (COL5A1) gene are purported to influence mechanical properties of collagenous tissues...
December 1, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/27695979/aging-and-the-effects-of-a-half-marathon-on-achilles-tendon-force-elongation-relationship
#6
Thijs Maria Anne Ackermans, Gaspar Epro, Christopher McCrum, Kai Daniel Oberländer, Frank Suhr, Maarten Robert Drost, Kenneth Meijer, Kiros Karamanidis
PURPOSE: We aimed to determine whether there are different changes in Achilles tendon (AT) mechanical properties in middle-aged, compared to younger runners that might indicate that tendon fatigue, induced by long-distance running, is age-dependent. METHODS: 27 middle-aged (50-67 years) and 22 younger (21-29 years) participants ran a 21 km route at their own pace (mean and SD: old: 3.1 ± 0.3 m s(-1); young: 3.6 ± 0.5 m s(-1)). We tested for changes in the AT force-elongation relationship using dynamometry and ultrasonography during isometric voluntary ankle plantarflexion ramp contractions, conducted 20-28 h pre-run, immediately pre-run, immediately post-run and 20-28 h post-run...
September 30, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27629031/muscle-spring-dynamics-in-time-limited-elastic-movements
#7
M V Rosario, G P Sutton, S N Patek, G S Sawicki
Muscle contractions that load in-series springs with slow speed over a long duration do maximal work and store the most elastic energy. However, time constraints, such as those experienced during escape and predation behaviours, may prevent animals from achieving maximal force capacity from their muscles during spring-loading. Here, we ask whether animals that have limited time for elastic energy storage operate with springs that are tuned to submaximal force production. To answer this question, we used a dynamic model of a muscle-spring system undergoing a fixed-end contraction, with parameters from a time-limited spring-loader (bullfrog: Lithobates catesbeiana) and a non-time-limited spring-loader (grasshopper: Schistocerca gregaria)...
September 14, 2016: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/27622405/real-time-sonoelastography-of-the-patellar-and-quadriceps-tendons-pattern-description-in-professional-athletes-and-healthy-volunteers
#8
Ayse Nur Sirin Ozcan, Sinan Tan, Nuray Gulden Tangal, Saliha Cıracı, Savas Kudas, Suleyman Bulent Bektaser, Halil Arslan
AIMS: The comparison of elastographic features of quadriceps and patellar tendons in a group of professional athletes and healthy volunteers and the description of elasticity characteristics of these tendons. MATERIAL AND METHODS: Thirty-nine professional athletes (22 male, 17 female; mean age 18.5 years) and 35 healthy volunteers (21 male, 14 female; mean age 19 years) were included. They were divided into two groups by gender. Quadriceps tendon, patellar side of the patellar tendon, and tibial side of the patellar tendon elasticity patterns and strain ratios were investigated with real-time ultrasound elastography...
September 2016: Medical Ultrasonography
https://www.readbyqxmd.com/read/27586836/athletic-training-affects-the-uniformity-of-muscle-and-tendon-adaptation-during-adolescence
#9
Falk Mersmann, Sebastian Bohm, Arno Schroll, Robert Marzilger, Adamantios Arampatzis
With the double stimulus of mechanical loading and maturation acting on the muscle-tendon unit, adolescent athletes might be at increased risk of developing imbalances of muscle strength and tendon mechanical properties. This longitudinal study aims to provide detailed information on how athletic training affects the time course of muscle-tendon adaptation during adolescence. In 12 adolescent elite athletes (A) and 8 similar-aged controls (C), knee extensor muscle strength and patellar tendon mechanical properties were measured over 1 yr in 3-mo intervals...
October 1, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27539811/increase-in-passive-muscle-tension-of-the-quadriceps-muscle-heads-in-jumping-athletes-with-patellar-tendinopathy
#10
Z J Zhang, G Y F Ng, W C Lee, S N Fu
To investigate the passive muscle tension of the quadriceps muscle heads in male athletes clinically diagnosed with patellar tendinopathy (PT) with those of healthy controls and explore the interplay between passive muscle tension and patellar tendon stiffness. Between November 2012 and December 2013, 66 male athletes (mean age of 21.1 ± 4.4 years) were examined using supersonic shear wave imaging technology. The passive tension of the vastus lateralis (VL) and rectus femoris (RF) muscles and patellar tendon stiffness were assessed...
August 19, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27535256/sex-hormones-and-tendon
#11
Mette Hansen, Michael Kjaer
The risk of overuse and traumatic tendon and ligament injuries differ between women and men. Part of this gender difference in injury risk is probably explained by sex hormonal differences which are specifically distinct during the sexual maturation in the teenage years and during young adulthood. The effects of the separate sex hormones are not fully elucidated. However, in women, the presence of estrogen in contrast to very low estrogen levels may be beneficial during regular loading of the tissue or during recovering after an injury, as estrogen can enhance tendon collagen synthesis rate...
2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/27535245/collagen-homeostasis-and-metabolism
#12
S Peter Magnusson, Katja M Heinemeier, Michael Kjaer
The musculoskeletal system and its collagen rich tissue is important for ensuring architecture of skeletal muscle, energy storage in tendon and ligaments, joint surface protection, and for ensuring the transfer of muscular forces into resulting limb movement. Structure of tendon is stable and the metabolic activity is low, but mechanical loading and subsequent mechanotransduction and molecular anabolic signaling can result in some adaptation of the tendon especially during youth and adolescence. Within short time, tendon will get stiffer with training and lack of mechanical tissue loading through inactivity or immobilization of the human body will conversely result in a dramatic loss in tendon stiffness and collagen synthesis...
2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/27515440/mechanical-and-material-properties-of-the-plantarflexor-muscles-and-achilles-tendon-in-children-with-spastic-cerebral-palsy-and-typically-developing-children
#13
Nicola Theis, Amir A Mohagheghi, Thomas Korff
BACKGROUND: Children with spastic cerebral palsy (CP) experience secondary musculoskeletal adaptations, affecting the mechanical and material properties of muscles and tendons. CP-related changes in the spastic muscle are well documented whilst less is known about the tendon. From a clinical perspective, it is important to understand alterations in tendon properties in order to tailor interventions or interpret clinical tests more appropriately. The main purpose of this study was to compare the mechanical and material properties of the Achilles tendon in children with cerebral palsy to those of typically developing children...
September 6, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27473447/does-knee-joint-cooling-change-in-vivo-patellar-tendon-mechanical-properties
#14
Luis M Alegre, Michael Hasler, Sebastian Wenger, Werner Nachbauer, Robert Csapo
PURPOSE: This study aimed to assess the influence of knee joint cooling on the in vivo mechanical properties of the patellar tendon. METHODS: Twenty young, healthy women volunteered for the study. B-mode ultrasonography was used to record patellar tendon elongation during isometric ramp contraction of the knee extensors (5-7 s, 90° knee angle) and calculate tendon stiffness. Skin temperature was measured by infrared thermometry. Data were acquired before and after 30 min of local icing of the knee joint and compared by paired samples t-tests...
October 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27472664/changes-in-water-content-in-response-to-an-acute-bout-of-eccentric-loading-in-a-patellar-tendon-with-a-history-of-tendinopathy-a-case-report
#15
Kai-Yu Ho, Kornelia Kulig
OBJECTIVE: This case-based report assessed resting water content and exercise-driven water exchange within a tendon with a history of tendinopathy and compared the response to that of a healthy uninvolved tendon. DESIGN: Case Report. SETTING: University imaging center. PARTICIPANT: The participant was a 27-year-old female basketball player 39 months following knee trauma. Patellar tendinopathy developed 12 months after the injury episode and was treated with eccentric exercises...
October 2016: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/27448345/shear-wave-measurements-for-evaluation-of-tendon-diseases
#16
Chia-Lun Yeh, Po-Ling Kuo, Jean-Luc Gennisson, Javier Brum, Mickael Tanter, Pai-Chi Li
This study investigated the feasibility of using supersonic shear wave measurements to quantitatively differentiate normal and damaged tendons based on their mechanical properties. Five freshly harvested porcine tendons excised from pig legs were used. Tendon damage was induced by incubating the tendons with a 1% w/v collagenase solution. Values of shear modulus were derived both by a time-of-flight (TOF) approach and by a transverse isotropic plate model (TI-model). Results show that as the preload applied to the tendon increased from 0 to 3 N, the mean shear modulus derived based on the TOF approach, the TI-model, and Young's modulus estimated from mechanical testing increased from 14...
July 18, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27362657/are-sport-specific-profiles-of-tendon-stiffness-and-cross-sectional-area-determined-by-structural-or-functional-integrity
#17
Hans-Peter Wiesinger, Florian Rieder, Alexander Kösters, Erich Müller, Olivier R Seynnes
The present study aimed to determine whether distinct sets of tendon properties are seen in athletes engaged in sports with contrasting requirements for tendon function and structural integrity. Patellar and Achilles tendon morphology and force-deformation relation were measured by combining ultrasonography, electromyography and dynamometry in elite ski jumpers, distance runners, water polo players and sedentary individuals. Tendon cross-sectional area normalized to body mass2/3 was smaller in water polo players than in other athletes (patellar and Achilles tendon; -28 to -24%) or controls (patellar tendon only; -9%)...
2016: PloS One
https://www.readbyqxmd.com/read/27361726/efficacy-of-radial-extracorporeal-shockwave-therapy-on-lateral-epicondylosis-and-common-extensor-tendon-stiffness-3157-board-222-june-3-2-00-pm-3-30-pm
#18
Tsung-Hsun Yang, Lin-Yi Wang, Yu-Chi Huang, Yiu-Chung Lau
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27359837/do-training-induced-changes-in-quadriceps-tendon-stiffness-result-in-reflective-changes-in-jump-kinematics-694-board-10-june-1-3-30-pm-5-00-pm
#19
Kari E Silva, Deborah A Riebe, Jacob E Earp
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27323324/efficacy-of-radial-extracorporeal-shock-wave-therapy-on-lateral-epicondylosis-and-changes-in-the-common-extensor-tendon-stiffness-with-pretherapy-and-posttherapy-in-real-time-sonoelastography-a-randomized-controlled-study
#20
Tsung-Hsun Yang, Yu-Chi Huang, Yiu-Chung Lau, Lin-Yi Wang
OBJECTIVE: To investigate the effects of radial extracorporeal shock wave therapy (rESWT) and to determine the posttreatment common extensor tendon stiffness among patients with lateral epicondylosis. DESIGN: Thirty patients with lateral epicondylosis were randomly divided into experimental and control groups. Participants in the experimental group received rESWT plus physical therapy, and those in the control group received sham shock wave plus physical therapy for 3 weeks...
June 17, 2016: American Journal of Physical Medicine & Rehabilitation
keyword
keyword
111116
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"