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Eccentric exercise

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https://www.readbyqxmd.com/read/29782040/two-repetitive-bouts-of-intense-eccentric-concentric-jaw-exercises-reduce-experimental-muscle-pain-in-healthy-subjects
#1
Rosaria Bucci, Frank Lobbezoo, Ambrosina Michelotti, Michail Koutris
BACKGROUND: High-intensity eccentric-concentric contractions of the jaw-closing muscles induce muscle soreness, fatigue, and functional impairment of the jaw, resembling the symptoms of myalgia, according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD). However, it is claimed that repetition of similar exercises can minimize these detrimental effects. OBJECTIVE: This study aimed to evaluate the response of jaw closing muscles following two series of intense eccentric-concentric exercises of the masticatory muscles in healthy subjects...
May 21, 2018: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/29781992/muscle-imbalances-testing-and-training-functional-eccentric-hamstring-strength-in-athletic-populations
#2
Petr Stastny, Michal Lehnert, James J Tufano
Many hamstring injuries that occur during physical activity occur while the muscles are lengthening, during eccentric hamstring muscle actions. Opposite of these eccentric hamstring actions are concentric quadriceps actions, where the larger and likely stronger quadriceps straighten the knee. Therefore, to stabilize the lower limbs during movement, the hamstrings must eccentrically combat against the strong knee-straightening torque of the quadriceps. As such, eccentric hamstring strength expressed relative to concentric quadricep strength is commonly referred to as the "functional ratio" as most movements in sports require simultaneous concentric knee extension and eccentric knee flexion...
May 1, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29781907/novel-interventions-for-recalcitrant-achilles-tendinopathy-benefits-seen-following-high-volume-image-guided-injection-or-extracorporeal-shockwave-therapy-a-prospective-cohort-study
#3
Patrick C Wheeler, Chloe Tattersall
OBJECTIVE: To compare the outcomes for patients with chronic noninsertional Achilles tendinopathy following extracorporeal shockwave therapy (ESWT) and high-volume image-guided injection (HVIGI). DESIGN: Prospective cohort study. SETTING: Hospital-based Sports Medicine Outpatient Clinic. PATIENTS: Sixty-three consecutive patients with chronic noninsertional Achilles tendinopathy, treated with ESWT (n = 22) or HVIGI (n = 41), with minimum 3-month follow-up...
May 16, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29775985/sensorimotor-exercises-and-enhanced-trunk-function-a-randomized-controlled-trial
#4
Steffen Mueller, Tilman Engel, Juliane Mueller, Josefine Stoll, Heiner Baur, Frank Mayer
The aim of this study was to investigate the effect of a 6-week sensorimotor or resistance training on maximum trunk strength and response to sudden, high-intensity loading in athletes.Forty-three healthy, well-trained participants were randomized into sensorimotor (SMT; n=11), resistance training (RT; n=16) and control groups (CG; n=16). Treatment groups received either sensorimotor training (SMT) or resistance training (RT) for 6 weeks, 3 times a week. At baseline and after 6 weeks of intervention, participants' maximum isokinetic strength in trunk rotation and extension was tested (concentric/eccentric 30°/s)...
May 18, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29770871/the-effects-of-acute-leucine-or-leucine-glutamine-co-ingestion-on-recovery-from-eccentrically-biased-exercise
#5
Mark Waldron, Cameron Ralph, Owen Jeffries, Jamie Tallent, Nicola Theis, Stephen David Patterson
This study investigated the effects of leucine or leucine + glutamine supplementation on recovery from eccentric exercise. In a double-blind independent groups design, 23 men were randomly assigned to a leucine (0.087 g/kg; n = 8), leucine + glutamine (0.087 g/kg + glutamine 0.3 g/kg; n = 8) or placebo (0.3 g/kg maltodextrin; n = 7) group. Participants performed 5 sets of drop jumps, with each set comprising 20 repetitions. Isometric knee-extensor strength, counter-movement jump (CMJ) height, delayed-onset muscle soreness (DOMS) and creatine kinase (CK) were measured at baseline, 1, 24, 48 h and 72 h post-exercise...
May 16, 2018: Amino Acids
https://www.readbyqxmd.com/read/29751254/isometric-pre-conditioning-blunts-exercise-induced-muscle-damage-but-does-not-attenuate-changes-in-running-economy-following-downhill-running
#6
Leonardo C R Lima, Natália M Bassan, Adalgiso C Cardozo, Mauro Gonçalves, Camila C Greco, Benedito S Denadai
Running economy (RE) is impaired following unaccustomed eccentric-biased exercises that induce muscle damage. It is also known that muscle damage is reduced when maximal voluntary isometric contractions (MVIC) are performed at a long muscle length 2-4 days prior to maximal eccentric exercise with the same muscle, a phenomenon that can be described as isometric pre-conditioning (IPC). We tested the hypothesis that IPC could attenuate muscle damage and changes in RE following downhill running. Thirty untrained men were randomly assigned into experimental or control groups and ran downhill on a treadmill (-15%) for 30 min...
May 8, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29741808/intravoxel-incoherent-motion-ivim-imaging-in-human-achilles-tendon
#7
Kenneth Wengler, Takeshi Fukuda, Dharmesh Tank, Mingqian Huang, Elaine S Gould, Mark E Schweitzer, Xiang He
BACKGROUND: Limited microcirculation has been implicated in Achilles tendinopathy and may affect healing and disease progression. Existing invasive and noninvasive approaches to evaluate tendon microcirculation lack sensitivity and spatial coverage. PURPOSE: To develop a novel Achilles tendon intravoxel incoherent motion (IVIM) MRI protocol to overcome the limitations from low tendon T2 /T2 * value and low intratendinous blood volume and blood velocity to evaluate tendon microcirculation...
May 9, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29740557/hip-and-trunk-muscles-activity-during-nordic-hamstring-exercise
#8
Shideh Narouei, Atsushi Imai, Hiroshi Akuzawa, Kiyotaka Hasebe, Koji Kaneoka
The nordic hamstring exercise (NHE) is a dynamic lengthening hamstring exercise that requires trunk and hip muscles activation. Thigh muscles activation, specifically hamstring/quadriceps contractions has been previously examined during NHE. Trunk and hip muscles activity have not been enough studied. The aim of this study was to analyze of hip and trunk muscles activity during NHE. Surface electromyography (EMG) and kinematic data were collected during NHE. Ten healthy men with the age range of 21-36 years performed two sets of two repetitions with downward and upward motions each of NHE...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29723585/platycodon-grandiflorum-derived-saponin-enhances-exercise-function-skeletal-muscle-protein-synthesis-and-mitochondrial-function
#9
Yong An Kim, Sun Woo Jin, Suck Hoon Oh, Gi Ho Lee, Hoa Thi Pham, Jae Ho Choi, Young Chul Chung, Wang Lok Lee, Sang Kyum Kim, Hye Gwang Jeong
Lower physical performance is an important risk factor in hypokinetic-related chronic disease, metabolic syndrome, and muscle atrophy. Our previous research demonstrated that Platycodon grandiflorum-derived saponin (PS) protects against eccentric exercise-induced muscle damage and mitochondrial function-related peroxisomal acyl-coenzme A oxidase (ACOX-1) and carnitine palmitoyltransferase (CPT-1) in high-fat diet-induced non-alcoholic steatohepatitis, and it inhibits osteoclast differentiation. However, the effects of PS on physical performance remain unknown...
April 30, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29721339/the-effect-of-therapeutic-exercise-on-long-standing-adductor-related-groin-pain-in-athletes-modified-h%C3%A3-lmich-protocol
#10
Abbas Yousefzadeh, Azadeh Shadmehr, Gholam Reza Olyaei, Nasrin Naseri, Zahra Khazaeipour
Objective: The Hölmich protocol in therapeutic exercise is the most appropriate method for the treatment of long-standing adductor-related groin pain (LSAGP). Herein, we evaluated a modified Hölmich protocol to resolve the possible limitations intrinsic to the Hölmich protocol in terms of the rate of return to sport and the recovery period for athletes with LSAGP. Design: The study followed a single-blind, before/after study design, where 15 athletes with LSAGP (mean age = 26...
2018: Rehabilitation Research and Practice
https://www.readbyqxmd.com/read/29709723/the-effect-of-functional-bracing-on-the-arthrokinematics-of-anterior-cruciate-ligament-injured-knees-during-lunge-exercise
#11
Maryam Jalali, Farzam Farahmand, Fateme Esfandiarpour, Seyed Ali Golestanha, Mohammad Akbar, Amirhosein Eskandari, Seyed Ebrahim Mousavi
BACKGROUND: Functional knee braces are extensively used for partially and completely torn anterior cruciate ligament (ACL) patients and those who have undergone ACL graft reconstruction, in order to support the healing ACL, improve the joint's functional stability, and restore the normal joint kinematics. RESEARCH QUESTION: Does wearing braces alter the arthrokinematics of the ACL deficient knees during lung exercise? METHODS: For ten male unilateral ACL deficient subjects, 3D knee models were reconstructed from CT images, acquired in rest position...
April 22, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29707959/acute-changes-in-muscle-thickness-and-pennation-angle-in-response-to-work-matched-concentric-and-eccentric-isokinetic-exercise
#12
Amilton Vieira, Anthony J Blazevich, Nuno Frade de Sousa, Rodrigo Celes, Savio Alex, James J Tufano, Martim Bottaro
Acute changes in muscle architecture influenced by muscle swelling might be associated with chronic adaptations to resistance exercise, including skeletal muscle growth. Concentric (CON) and eccentric (ECC) muscle actions both play a role in hypertrophic processes, but the influence of each on acute indices of muscle swelling [i.e. muscle thickness (MT) and pennation angle PA)] remain relatively unknown. Therefore, this study compared the acute changes in MT and PA in response to work-matched CON versus ECC isokinetic exercise...
April 30, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29706713/effects-of-eccentric-control-exercise-for-wrist-extensor-and-shoulder-stabilization-exercise-on-the-pain-and-functions-of-tennis-elbow
#13
Ju-Hyun Lee, Tae-Ho Kim, Kyu-Bong Lim
[Purpose] This study aimed to conduct experiments to examine the effects of wrist eccentric control exercise or shoulder stabilization exercises after a basic direct treatment of the elbow in the treatment of tennis elbow patients in terms of pain and grip strength. [Subjects and Methods] The subjects were divided into two groups: one group conducted wrist eccentric control exercise and was comprised of 5 male and 4 female subjects, and the other group received shoulder stabilization exercise and was comprised of 5 male and 4 female subjects...
April 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29699580/genetic-deletion-of-muscle-rank-or-selective-inhibition-of-rankl-is-not-as-effective-as-full-length-opg-fc-in-mitigating-muscular-dystrophy
#14
Sébastien S Dufresne, Antoine Boulanger-Piette, Sabrina Bossé, Anteneh Argaw, Dounia Hamoudi, Laetitia Marcadet, Daniel Gamu, Val A Fajardo, Hideo Yagita, Josef M Penninger, A Russell Tupling, Jérôme Frenette
Although there is a strong association between osteoporosis and skeletal muscle atrophy/dysfunction, the functional relevance of a particular biological pathway that regulates synchronously bone and skeletal muscle physiopathology is still elusive. Receptor-activator of nuclear factor κB (RANK), its ligand RANKL and the soluble decoy receptor osteoprotegerin (OPG) are the key regulators of osteoclast differentiation and bone remodelling. We thus hypothesized that RANK/RANKL/OPG, which is a key pathway for bone regulation, is involved in Duchenne muscular dystrophy (DMD) physiopathology...
April 24, 2018: Acta Neuropathologica Communications
https://www.readbyqxmd.com/read/29694677/interseason-variability-in-isokinetic-strength-and-poor-correlation-with-nordic-hamstring-eccentric-strength-in-football-players
#15
Nicol van Dyk, Erik Witvrouw, Roald Bahr
INTRODUCTION: In elite sport, the use of strength testing to establish muscle function and performance is common. Traditionally, isokinetic strength tests have been used, measuring torque during concentric and eccentric muscle action. A device that measures eccentric hamstring muscle strength while performing the Nordic hamstring exercise is now also frequently used. The study aims to investigate the variability of isokinetic muscle strength over time, e.g. between seasons, and the relationship between isokinetic testing and the new Nordic hamstring exercise device...
April 25, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29685059/hamstring-muscle-use-in-females-during-hip-extension-and-the-nordic-hamstring-exercise-an-fmri-study
#16
Daniel J Messer, Matthew N Bourne, Morgan D Williams, Aiman Al Najjar, Anthony J Shield
Study Design Cross-sectional study. Background Understanding hamstring muscle activation patterns in resistance training exercises may have implications for the design of strength training and injury prevention programs. Unfortunately, surface electromyography studies have reported conflicting results with regard to hamstring muscle activation patterns in women. Objectives To determine the spatial patterns of hamstring muscle activity during the 45º hip-extension and Nordic hamstring exercises, in females using functional magnetic resonance imaging...
April 23, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29682311/acl-reconstruction-with-hamstring-tendon-autograft-and-accelerated-brace-free-rehabilitation-a-systematic-review-of-clinical-outcomes
#17
Rob P A Janssen, Nicky van Melick, Jan B A van Mourik, Max Reijman, Lodewijk W van Rhijn
Objective: To investigate the clinical outcomes after hamstring tendon autograft ACL reconstruction (ACLR) with accelerated, brace-free rehabilitation. Design: Systematic review according to Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines. Data sources: Embase, MEDLINE Ovid, Web of Science, Cochrane CENTRAL and Google scholar from 1 January 1974 to 31 January 2017. Eligibility criteria for selecting studies: Study designs reporting outcomes in adults after arthroscopic, primary ACLR with hamstring autograft and accelerated, brace-free rehabilitation...
2018: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29671490/common-running-injuries-evaluation-and-management
#18
Michael J Arnold, Aaron L Moody
Running is a common form of exercise but predisposes athletes to several running-related injuries. Most running injuries are due to overuse and respond to conservative treatment. Tendinopathies in the patellar, Achilles, and hamstring tendons are common, and are primarily treated with eccentric exercise. Iliotibial band syndrome and patellofemoral pain syndrome are less common than patellar tendinopathy and are treated by strengthening exercises for the core and legs in addition to flexibility exercises. Acute hamstring strains and medial tibial stress syndrome require a period of relative rest, followed by stretching and graded return to activity...
April 15, 2018: American Family Physician
https://www.readbyqxmd.com/read/29663541/eccentric-exercise-increases-circulating-fibroblast-activation-protein-but-not-bioactive-fibroblast-growth-factor-21-in-healthy-humans
#19
Biraj Parmar, Jo E Lewis, Ricardo J Samms, Francis J P Ebling, Christine C Cheng, Andrew C Adams, Joanne Mallinson, Scott Cooper, Tariq Taylor, Reza Ghasemi, Francis B Stephens, Kostas Tsintzas
NEW FINDINGS: What is the central question of this study? The role of FGF21 as an exercise-induced myokine remains controversial. The aim of this study was to determine whether eccentric exercise would augment the release of FGF21 and/or its regulatory enzyme Fibroblast Activation Protein (FAP) from skeletal muscle tissue into the systemic circulation of healthy human volunteers. What is the main finding and its importance? Eccentric exercise does not release total or bioactive FGF21 from human skeletal muscle...
April 16, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29663488/delayed-onset-muscle-soreness-in-human-masticatory-muscles-increases-inhibitory-jaw-reflex-responses
#20
Michail Koutris, Kemal S Türker, Maurits K A van Selms, Frank Lobbezoo
INTRODUCTION: The effects of masticatory muscles' overloading on jaw-motor control are not yet fully clarified. Therefore, it was tested whether eccentric and concentric exercises of the human masticatory muscles would influence inhibitory jaw-reflex responses. METHODS: 11 participants (6 males, 5 females) performed 6, 5-min bouts of eccentric-concentric contractions. Before, immediately after, 24 hours, 48 hours, and one week afterwards, visual analogue scale (VAS) scores for jaw-muscle fatigue and pain, maximum voluntary bite force (MVBF), and inhibitory jaw reflexes were recorded...
April 16, 2018: Journal of Oral Rehabilitation
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