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https://www.readbyqxmd.com/read/29658519/biomechanical-evaluation-of-tendon-connection-with-novel-suture-techniques
#1
Zhe Chen, Jun Wang, Jia-Sen Wei, Zhao-Yang Hou, Min Li, Qi-Xin Chen
PURPOSE: Achilles tendon rupture is a severe injury with poor curative effect due to its anatomical characteristic and mechanical peculiarity. Internal fixation of limited loop (IFLL) with steel-wire has been applied on patients with tendon rupture to fix the broken ends before physical rehabilitation. The purpose of this study is to investigate the biomechanical property and radiological characteristic of such suture technique for the repairment of tendon rupture. METHODS: Tendons of pigs' hint feet were separated for the biomechanical study...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29650412/theoretical-considerations-for-muscle-energy-savings-during-distance-running
#2
Jared R Fletcher, Brian R MacIntosh
We have recently demonstrated that the triceps surae muscles energy cost (ECTS ) represents a substantial portion of the total metabolic cost of running (Erun ). Therefore, it seems relevant to evaluate the factors which dictate ECTS , namely the amount and velocity of shortening, since it is likely these factors will dictate Erun . Erun and triceps surae morphological and AT mechanical properties were obtained in 46 trained and elite male and female distance runners using ultrasonography and dynamometry. ECTS (J·stride-1 ) at the speed of lactate threshold (sLT) was estimated from AT force and crossbridge mechanics and energetics...
March 27, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29596014/lower-tendon-stiffness-in-very-old-compared-to-old-individuals-is-unaffected-by-short-term-resistance-training-of-skeletal-muscle
#3
Christian Skou Eriksen, Cecilie Henkel, Rene Brüggebusch Svensson, Anne-Sofie Agergaard, Christian Couppe, Michael Kjaer, S Peter Magnusson
Aging negatively affects collagen-rich tissue like tendons, but in vivo tendon mechanical properties and the influence of physical activity after the 8th decade of life remains to be determined. This study aimed to compare in vivo patellar tendon mechanical properties in moderately old (OLD) and very old (VERY OLD) adults, and the effect of short term resistance training. Twenty OLD (9 women, 11 men, >65 y) and 30 VERY OLD (11 women, 19 men, >83 years) were randomly allocated to heavy resistance training (HRT) or no training (CON) and underwent testing of in vivo patellar tendon (PT) mechanical properties and PT dimensions before and after three months intervention...
March 29, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29541035/alterations-in-leg-extensor-muscle-tendon-unit-biomechanical-properties-with-ageing-and-mechanical-loading
#4
REVIEW
Christopher McCrum, Pamela Leow, Gaspar Epro, Matthias König, Kenneth Meijer, Kiros Karamanidis
Tendons transfer forces produced by muscle to the skeletal system and can therefore have a large influence on movement effectiveness and safety. Tendons are mechanosensitive, meaning that they adapt their material, morphological and hence their mechanical properties in response to mechanical loading. Therefore, unloading due to immobilization or inactivity could lead to changes in tendon mechanical properties. Additionally, ageing may influence tendon biomechanical properties directly, as a result of biological changes in the tendon, and indirectly, due to reduced muscle strength and physical activity...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29511448/co-injection-of-human-adipose-stromal-cells-and-rhbmp-2-fibrin-gel-enhances-tendon-graft-osteointegration-in-a-rabbit-anterior-cruciate-ligament-reconstruction-model
#5
Ping Chen, Jun Ouyang, Jiangwei Xiao, Zhongyu Han, Qiang Yu, Jing Tian, Li Zhang
The objective of this study was to investigate whether the co-injection of human adipose stromal cells (hASCs) and rhBMP-2/fibrin gel into the bone tunnels of anterior cruciate-ligament reconstructions can effectively enhance tendon graft osteointegration. We performed bilateral reconstructions using autologous semitendinosus tendons in 45 New Zealand rabbits, which we divided into three groups. We injected the bone tunnels with fibrin gel for group 1, rhBMP-2 (1 μg/ml)/fibrin gel for group 2, and hASCs wrapped in rhBMP-2 (1 μg/ml)/fibrin gel for group 3...
2018: American Journal of Translational Research
https://www.readbyqxmd.com/read/29505741/the-role-of-the-paratenon-in-achilles-tendon-healing-a-study-in-rats
#6
Sebastian A Müller, Christopher H Evans, Patricia E Heisterbach, Martin Majewski
BACKGROUND: The role of the paratenon in tendon healing is unknown. The present study compares healing in the presence or absence of the paratenon in an Achilles tendon defect model in rats. HYPOTHESIS: Resection of the paratenon impairs tendon healing. STUDY DESIGN: Controlled laboratory study. METHODS: Sixty skeletally mature Sprague Dawley rats were randomly assigned to either a resected paratenon (RP) group or an intact paratenon (IP) group...
March 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29494289/effects-of-triceps-surae-muscle-strength-and-tendon-stiffness-on-the-reactive-dynamic-stability-and-adaptability-of-older-female-adults-during-perturbed-walking
#7
Gaspar Epro, Christopher McCrum, Andreas Mierau, Michael Leyendecker, Gert-Peter Bruggemann, Kiros Karamanidis
This study aimed to examine whether the triceps surae (TS) muscle-tendon unit (MTU) mechanical properties affects gait stability and its reactive adaptation potential to repeated perturbation exposure in older adults. Thirty-four older adults each experienced eight separate unexpected perturbations during treadmill walking, while a motion capture system was used to determine the margin of stability (MoS) and base of support (BoS). Ankle plantarflexor muscle strength and Achilles tendon (AT) stiffness were analysed using ultrasonography and dynamometry...
March 1, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29463386/effects-of-tracking-landmarks-and-tibial-point-of-resistive-force-application-on-the-assessment-of-patellar-tendon-mechanical-properties-in-vivo
#8
Falk Mersmann, Olivier R Seynnes, Kirsten Legerlotz, Adamantios Arampatzis
The different methods used to assess patellar tendon elongation in vivo may partly explain the large variation of mechanical properties reported in the literature. The present study investigated the effects of tracking landmark position and tibial point of resistive force application during leg extensions in a dynamometer. Nineteen adults performed isometric contractions with a proximal and distal dynamometer shank pad position. Knee joint moments were calculated employing an inverse dynamics approach. Tendon elongation was measured using the patellar apex and either the tibial tuberosity (T) or plateau (P) as tracking landmark...
February 11, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29420151/altered-achilles-tendon-function-during-walking-in-people-with-diabetic-neuropathy-implications-for-metabolic-energy-saving
#9
Milos Petrovic, Constantinos N Maganaris, Kevin Deschamps, Sabine M Verschueren, Frank L Bowling, Andrew Jm Boulton, Neil D Reeves
The Achilles tendon (AT) has the capacity to store and release elastic energy during walking, contributing to metabolic energy savings. In diabetes patients, it is hypothesised that a stiffer Achilles tendon may reduce the capacity for energy saving through this mechanism, thereby contributing to an increased metabolic cost of walking (CoW). The aim of this study was to investigate the effects of diabetes and diabetic peripheral neuropathy (DPN) on the Achilles tendon and plantarflexor muscle-tendon unit behaviour during walking...
February 8, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29249987/imbalances-in-the-development-of-muscle-and-tendon-as-risk-factor-for-tendinopathies-in-youth-athletes-a-review-of-current-evidence-and-concepts-of-prevention
#10
REVIEW
Falk Mersmann, Sebastian Bohm, Adamantios Arampatzis
Tendons feature the crucial role to transmit the forces exerted by the muscles to the skeleton. Thus, an increase of the force generating capacity of a muscle needs to go in line with a corresponding modulation of the mechanical properties of the associated tendon to avoid potential harm to the integrity of the tendinous tissue. However, as summarized in the present narrative review, muscle and tendon differ with regard to both the time course of adaptation to mechanical loading as well as the responsiveness to certain types of mechanical stimulation...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29161769/influence-of-biceps-brachii-tendon-mechanical-properties-on-elbow-flexor-force-steadiness-in-young-and-old-males
#11
Rowan R Smart, Stéphane Baudry, Andrey Fedorov, Samantha L Kuzyk, Jennifer M Jakobi
Elbow flexor force steadiness (FS) depends on strength and decreases with age. Achilles tendon mechanics effect standing balance and isometric plantarflexion FS. This study investigated the influence of distal biceps brachii (BB) tendon mechanics and elbow flexor strength on age-related decline in FS. Nine young (23±2 years) and 9 old (77±5 years) males performed submaximal isometric elbow flexion tasks at low (2.5, 5, 10% maximal voluntary contraction (MVC)) and high (20, 40, 60, 80%MVC) forces in a neutral forearm position...
November 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29101577/tendon-pathology-in-hypercholesterolemia-and-familial-hypercholesterolemia
#12
REVIEW
Brittany Taylor, Adnan Cheema, Louis Soslowsky
PURPOSE OF REVIEW: Hypercholesterolemia (HC), or high cholesterol, is usually caused by diet, other health conditions, or inherited diseases, such as familial hypercholesterolemia (FHC). Studies have shown patients with hypercholesterolemia are more prone to tendon injury and impaired healing. Nonetheless, the mechanism by which high cholesterol alters the biochemical and biomechanical properties of tendon and the healing environment is not well defined. This review highlights scientific findings on the relationship between hypercholesterolemia and treatments and tendon pathology at the cellular and tissue level...
November 4, 2017: Current Rheumatology Reports
https://www.readbyqxmd.com/read/29100187/mechanical-muscle-and-tendon-properties-of-the-plantar-flexors-are-altered-even-in-highly-functional-children-with-spastic-cerebral-palsy
#13
Annika Kruse, Christian Schranz, Martin Svehlik, Markus Tilp
BACKGROUND: Recent ultrasound studies found increased passive muscle stiffness and no difference in tendon stiffness in highly impaired children and young adults with cerebral palsy. However, it is not known if muscle and tendon mechanical properties are already altered in highly functional children with cerebral palsy. Therefore, the purpose of this study was to compare the mechanical and material properties of the plantar flexors in highly functional children with cerebral palsy and typically developing children...
December 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28977366/muscle-and-tendon-contributions-to-reduced-rate-of-torque-development-in-healthy-older-males
#14
Jonathan I Quinlan, Constantinos N Maganaris, Martino V Franchi, Kenneth Smith, Philip J Atherton, Nathaniel J Szewczyk, Paul L Greenhaff, Bethan E Phillips, James I Blackwell, Catherine Boereboom, John P Williams, John Lund, Marco V Narici
Background: The ability to rapidly generate and transfer muscle force is essential for effective corrective movements in order to prevent a fall. The aim of this study was to establish the muscle and tendon contributions to differences in rate of torque development (RTD) between younger (YM) and older males (OM). Method: Twenty-eight young males (23.9 years ± 1.1) and 22 old males (68.5 years ± 0.5) were recruited for assessment of Quadriceps Anatomical CSA (ACSA), maximal voluntary contraction (MVC), rate of torque development (RTD), and tendon biomechanical properties...
August 2, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28974931/muscle-tendon-unit-properties-during-eccentric-exercise-correlate-with-the-creatine-kinase-response
#15
Kirsty M Hicks, Gladys L Onambele-Pearson, Keith Winwood, Christopher I Morse
Aim: The aim of this paper was to determine whether; (1) patella tendon stiffness, (2) the magnitude of vastus lateralis fascicle lengthening, and (3) eccentric torque correlate with markers of exercise induced muscle damage. Method: Combining dynamometry and ultrasonography, patella tendon properties and vastus lateralis architectural properties were measured pre and during the first of six sets of 12 maximal voluntary eccentric knee extensions. Maximal isometric torque loss and creatine kinase activity were measured pre-damage (-48 h), 48, 96, and 168 h post-damage as markers of exercise-induced muscle damage...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28948634/applying-physical-science-principles-to-mid-substance-achilles-tendinopathy-and-the-relationship-to-eccentric-lengthening-exercises
#16
Geoffrey M Verrall, Bronwyn K Dolman, Thomas Best
OBJECTIVES: Mid-substance Achilles tendinopathy is common in the active population. Eccentric (lengthening) exercises are known to be effective in alleviating the clinical condition. To better understand mid-substance Achilles tendinopathy and the response to lengthening exercises physical science principles of elasticity are applied. METHOD: We apply elastic motion laws to the spring-like tendon as well as the normal and pathological adaptation seen with this common injury...
September 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28944585/loading-rate-and-contraction-duration-effects-on-in%C3%A2-vivo-human-achilles-tendon-mechanical-properties
#17
Christopher McCrum, Kai D Oberländer, Gaspar Epro, Peter Krauss, Darren C James, Neil D Reeves, Kiros Karamanidis
Tendons are viscoelastic, which implies loading rate dependency, but loading rates of contractions are often not controlled during assessment of human tendon mechanical properties in vivo. We investigated the effects of sustained submaximal isometric plantarflexion contractions, which potentially negate loading rate dependency, on the stiffness of the human Achilles tendon in vivo using dynamometry and ultrasonography. Maximum voluntary contractions (high loading rate), ramp maximum force contractions with 3 s loading (lower loading rate) and sustained contractions (held for 3 s) at 25%, 50% and 80% of maximal tendon force were conducted...
September 24, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28801950/can-chronic-stretching-change-the-muscle-tendon-mechanical-properties-a-review
#18
REVIEW
Sandro R Freitas, Bruno Mendes, Guillaume Le Sant, Ricardo J Andrade, Antoine Nordez, Zoran Milanovic
PURPOSE: It is recognized that stretching is an effective method to chronically increase the joint range of motion. However, the effects of stretching training on the muscle-tendon structural properties remain unclear. This systematic review with meta-analysis aimed to determine whether chronic stretching alter the muscle-tendon structural properties. METHODS: Published papers regarding longitudinal stretching (static, dynamic and/or PNF) intervention (either randomized or not) in humans of any age and health status, with more than 2 weeks in duration and at least 2 sessions per week, were searched in PubMed, PEDro, ScienceDirect and ResearchGate databases...
August 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28801518/effects-of-plyometric-and-isometric-training-on-muscle-and-tendon-stiffness-in%C3%A2-vivo
#19
Keitaro Kubo, Tomonobu Ishigaki, Toshihiro Ikebukuro
The purpose of this study was to compare the effects of plyometric and isometric training on tendon properties during ramp and ballistic contractions and muscle stiffness under passive and active conditions. Eleven subjects completed 12 weeks (3 days/week) of a unilateral training program for the plantar flexors. They performed plyometric training on one side (PLY) and isometric training on the other side (ISO). Active muscle stiffness in the medial gastrocnemius muscle was calculated according to changes in estimated muscle force and fascicle length during fast stretching after submaximal isometric contractions...
August 2017: Physiological Reports
https://www.readbyqxmd.com/read/28753624/muscular-fatigue-in-response-to-different-modalities-of-crossfit-sessions
#20
José Luis Maté-Muñoz, Juan H Lougedo, Manuel Barba, Pablo García-Fernández, Manuel V Garnacho-Castaño, Raúl Domínguez
BACKGROUND: CrossFit is a new strength and conditioning regimen involving short intense daily workouts called workouts of the day (WOD). This study assesses muscular fatigue levels induced by the three modalities of CrossFit WOD; gymnastics (G), metabolic conditioning (M) and weightlifting (W). MATERIAL AND METHODS: 34 healthy subjects undertook three WOD (one per week): a G WOD consisting of completing the highest number of sets of 5 pull-ups, 10 push-ups and 15 air squats in 20 min; an M WOD, in which the maximum number of double skipping rope jumps was executed in 8 sets (20 s), resting (10 s) between sets; and finally, a W WOD in which the maximum number of power cleans was executed in 5 min, lifting a load equivalent to 40% of the individual's 1RM...
2017: PloS One
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