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https://www.readbyqxmd.com/read/29031138/similarity-of-muscle-synergies-extracted-from-the-lower-limb-including-the-deep-muscles-between-level-and-uphill-treadmill-walking
#1
Akira Saito, Aya Tomita, Ryosuke Ando, Kohei Watanabe, Hiroshi Akima
This study aimed to examine muscle synergies involving the deeper muscles of the lower limb during level and uphill treadmill walking. Seven men and five women walked on a treadmill at three speeds (60, 80, and 100m/min) and two grades (level and 10% grade). Surface electromyographic (EMG) signals were recorded from 10 muscles of the lower limb, including vastus intermedius, adductor magnus, and adductor longus. Muscle synergies were extracted applying non-negative matrix factorization, and the relative co-activation across muscles and the temporal information of synergy recruitment were identified by the muscle synergy vector and synergy activation coefficient, respectively...
October 8, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29024807/reactive-oxygen-species-enhance-mitochondrial-function-insulin-sensitivity-and-glucose-uptake-in-skeletal-muscle-of-senescence-accelerated-prone-mice-samp8
#2
Valentin Barquissau, Frédéric Capel, Dominique Dardevet, Christine Feillet-Coudray, Anne Gallinier, Marie-Agnès Chauvin, Jennifer Rieusset, Béatrice Morio
Whereas reactive oxygen species (ROS) can have opposite impacts on insulin signaling, they have mainly been associated with mitochondrial dysfunction in skeletal muscle. We analyzed the relationship between these three features in skeletal muscle of senescence accelerated mice (SAM) prone (P8), which are characterized by enhanced oxidative stress compared to SAM resistant (R1). Oxidative stress, ROS production, antioxidant system, mitochondrial content and functioning, as well as in vitro and in vivo insulin signaling were investigated in gastrocnemius and quadriceps muscles...
October 9, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29023529/radiographic-measurement-of-the-quadriceps-angle-in-dogs
#3
Stefania Pinna, Noemi Romagnoli
The direction of the force of the quadriceps muscle group is expressed by the value of the quadriceps angle, between the long axis of the muscle rectus femoris and the patellar ligament. This value is often modified in dogs with patellar luxation, a common orthopaedic disease of the stifle joint in both small and large dogs. The aims of the present study were to give a reference value for the quadriceps angle in healthy small and medium-large breed dogs. The medical records of healthy dogs and their pelvic limb radiographs (2014-2016) were reviewed...
2017: PloS One
https://www.readbyqxmd.com/read/29023249/priming-with-1-hz-rtms-over-contralesional-leg-motor-cortex-does-not-increase-the-rate-of-regaining-ambulation-within-3-months-of-stroke-a-randomized-controlled-trial
#4
Ying-Zu Huang, Li-Fong Lin, Kwang-Hwa Chang, Chaur-Jong Hu, Tsan-Hon Liou, Yen-Nung Lin
BACKGROUND: The potential benefits of repetitive transcranial magnetic stimulation (rTMS), applied either alone or as a combination treatment, on recovery of lower extremities after stroke have been insufficiently studied. OBJECTIVE: To evaluate the effect of priming with 1-Hz rTMS over contralesional leg motor area with a double cone coil prior physical therapy (PT) on regaining ambulation. METHODS: Thirty-eight subacute stroke patients with significant leg disabilities were randomly assigned into the experimental (E) group or control (C) group to receive a 15-min real or sham 1-Hz rTMS, respectively, over the contralesional motor cortex representing the quadriceps muscle followed by 45-min PT for 15 sessions over 3 weeks...
October 10, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29019442/the-use-of-hamstring-fatigue-to-reduce-quadriceps-inhibition-after-anterior-cruciate-ligament-reconstruction
#5
Timothy Lowe, Xuanliang Neil Dong
Arthrogenic muscle inhibition, an inability to fully activate the quadriceps muscles, has been persistently observed after anterior cruciate ligament reconstruction (ACLr) surgery. Reductions in quadriceps activation may be partly due to the flexion reflex pathway, hamstrings activation, and reciprocal quadriceps inhibition. Since central fatigue has been shown to modify hamstring excitability and change the hamstring reflex response, hamstring fatigue might alleviate quadriceps muscle inhibition by counteracting the flexion reflex...
January 1, 2017: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/29018363/moderate-load-muscular-endurance-strength-training-did-not-improve-peak-power-or-functional-capacity-in-older-men-and-women
#6
Simon Walker, Guy G Haff, Keijo Häkkinen, Robert U Newton
The present study determined the effects of muscular endurance strength training on maximum strength and power, functional capacity, muscle activation and hypertrophy in older men and women. Eighty-one men and women acted as an intervention group while 22 acted as non-training controls (age range 64-75 y). Intervention training included super-sets (i.e., paired exercises, immediately performing the second exercises following completion of the first) with short rest intervals (30-60 s between sets) at an intensity of 50-60% one-repetition maximum (1-RM) for 15-20 repetitions...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29017801/influence-of-increased-posterior-tibial-slope-in-total-knee-arthroplasty-on-knee-joint-biomechanics-a-computational-simulation-study
#7
Kyoung-Tak Kang, Yong-Gon Koh, Juhyun Son, Oh-Ryong Kwon, Jun-Sang Lee, Sae-Kwang Kwon
BACKGROUND: The reconstructed posterior tibial slope (PTS) plays a significant role in restoring knee kinematics in cruciate-retaining-total knee arthroplasty (TKA). A few studies have reported the effect of the PTS on biomechanics. METHODS: This study investigates the effect of the PTS on tibiofemoral (TF) kinematics, patellofemoral (PF) contact stress, and forces at the quadriceps, posterior cruciate ligament (PCL) and collateral ligament after cruciate-retaining-TKA using computer simulations...
September 21, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29016479/the-effects-of-foam-rolling-as-a-recovery-tool-in-professional-soccer-players
#8
Ezequiel Rey, Alexis Padrón-Cabo, Pablo B Costa, Roberto Barcala-Furelos
Foam rolling (FR) is a common strategy used after training and competition by players. However, no previous studies have assessed the effectiveness of FR as recovery tool in sports populations. The aim of this study was to examine the effectiveness of FR (20 minutes of foam rolling exercises on quadriceps, hamstrings, adductors, gluteals, and gastrocnemius) and passive recovery (20 minutes sit on a bench) interventions performed immediately after a training session on Total Quality Recovery (TQR), perceived muscle soreness, jump performance, agility, sprint, and flexibility 24 hours after the training...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29016428/functional-outcomes-following-operative-treatment-of-tibial-tubercle-fractures
#9
Anthony I Riccio, Kirsten Tulchin-Francis, Grant D Hogue, Robert L Wimberly, Corey S Gill, DeRaan Collins, Lori A Karol
BACKGROUND: Quantitative evaluation of the functional results of surgically managed tibial tubercle fractures in adolescents is unreported in the orthopaedic literature. METHODS: All patients treated surgically for unilateral tibial tubercle fractures at a single institution from 2007 to 2011 were invited to return for functional evaluation. Fractures were classified using the Ogden classification system. Clinical examination at follow-up included passive knee range of motion and thigh circumference...
October 9, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/29016187/quantitative-and-qualitative-analysis-of-the-medial-patellar-ligaments-an-anatomic-and-radiographic-study
#10
Bradley M Kruckeberg, Jorge Chahla, Gilbert Moatshe, Mark E Cinque, Kyle J Muckenhirn, Jonathan A Godin, Taylor J Ridley, Alex W Brady, Elizabeth A Arendt, Robert F LaPrade
BACKGROUND: The qualitative and quantitative anatomy of the medial patellar stabilizers has been reported; however, a quantitative analysis of the anatomic and radiographic attachments of all 4 ligaments relative to anatomic and osseous landmarks, as well as to one another, has yet to be performed. PURPOSE: To perform a qualitative and quantitative anatomic and radiographic evaluation of the medial patellofemoral ligament (MPFL), medial patellotibial ligament (MPTL), medial patellomeniscal ligament (MPML), and medial quadriceps tendon femoral ligament (MQTFL) attachment sites, with attention to their relationship to pertinent osseous and soft tissue landmarks...
October 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28992769/knee-extensor-rate-of-torque-development-before-and-after-arthroscopic-partial-meniscectomy-with-analysis-of-neuromuscular-mechanisms
#11
Daniel G Cobian, Cameron M Koch, Annunziato Amendola, Glenn N Williams
Study Design Descriptive, prospective single-cohort longitudinal study. Background Rapid torque development is essential in activities of daily living and sports, but isn't specifically tested by most physical therapists or incorporated into rehabilitation programs until late in the treatment process. Little evidence is available on quadriceps rate of torque development capacity before and after arthroscopic knee surgery. Objectives To study knee extensor rate of torque development, contributing mechanisms, and associations with strength and patient-reported outcomes, before and during the first six weeks after arthroscopic partial meniscectomy...
October 9, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28991061/determination-of-ed50-and-ed95-of-0-5-ropivacaine-in-adductor-canal-block-to-produce-quadriceps-weakness-a-dose-finding-study
#12
David F Johnston, Rakesh V Sondekoppam, Robert Giffin, Robert Litchfield, Sugantha Ganapathy
BACKGROUND AND OBJECTIVES: Adductor canal block (ACB) is popular for knee analgesia because of its favorable effect on quadriceps strength. The aim of this study was to find the minimum volume of local anesthetic, which can be injected into the ACB that would result in quadriceps weakness. METHODS: This nonrandomized study used an up-and-down sequential allocation design. Twenty-six patients scheduled to undergo arthroscopic knee surgery received an ultrasound-guided ACB preoperatively...
October 5, 2017: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/28991041/quadriceps-function-and-knee-joint-ultrasonography-following-acl-reconstruction
#13
Derek N Pamukoff, Melissa M Montgomery, Tyler J Moffit, Michael N Vakula
PURPOSE: Individuals with anterior cruciate ligament reconstruction (ACLR) are at greater risk for knee osteoarthritis (OA), partially due to chronic quadriceps dysfunction. Articular cartilage is commonly assessed using magnetic resonance imaging and radiography, but these methods are expensive and lack portability. Ultrasound imaging may provide a cost-effective and portable alternative for imaging the femoral cartilage. The purpose of this study was to compare ultrasonography of the femoral cartilage between the injured and uninjured limbs of individuals with unilateral ACLR, and to examine the association between quadriceps function and ultrasonographic measures of femoral cartilage...
October 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28990491/young-athletes-after-anterior-cruciate-ligament-reconstruction-cleared-for-sports-participation-how-many-actually-meet-recommended-return-to-sport-criteria-cutoffs
#14
Allison R Toole, Matthew P Ithurburn, Mitchell J Rauh, Timothy E Hewett, Mark V Paterno, Laura C Schmitt
Study Design Prospective cohort study. Background While meeting objective criteria cutoffs are recommended prior to return-to-sport (RTS) following ACL reconstruction (ACLR), the number of young athletes meeting recommended cutoffs and their impact on longitudinal sports participation are unknown. Objectives To test the hypothesis that a higher proportion of young athletes who met recommended cutoffs would maintain the same level of sports participation over the year following RTS clearance compared to those who did not...
October 7, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28988329/ultrasonography-and-return-to-play-of-the-different-clinical-grading-of-quadriceps-contusions-a-case-series
#15
Rolando Junior L Torres, Soichi Hattori, Yuki Kato, Shin Yamada, Hiroshi Ohuchi
Prognostication of quadriceps contusion is based on the patient's active knee flexion after the injury. Unlike ultrasonography, clinical grading does not define the extent of soft tissue injury and may provide inaccurate time for return to play. The purposes of this report are to describe the ultrasound findings of the different clinical grading of quadriceps contusion and document the return to play of each case. Seven patients were evaluated in this series. Results showed discrepancies in the disability time between clinical grading and ultrasound findings...
October 7, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28987643/blood-flow-restricted-resistance-training-in-older-adults-at-risk-of-mobility-limitations
#16
Summer B Cook, Dain P LaRoche, Michelle R Villa, Hannah Barile, Todd M Manini
High-load resistance training (HL) may be contraindicated in older adults due to pre-existing health conditions (e.g. osteoarthritis). Low-load blood flow restricted (BFR) resistance training offers an alternative to HL with potentially similar strength improvement. PURPOSE: To compare muscle strength, cross-sectional area (CSA), physical function, and quality of life (QOL) following 12-weeks of HL or BFR training in older adults at risk of mobility limitations. METHODS: Thirty-six males and females (mean: 75...
October 5, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28985252/age-and-sex-based-recovery-curves-to-track-functional-outcomes-in-older-adults-with-total-knee-arthroplasty
#17
Yong-Hao Pua, Felicia Jie-Ting Seah, Cheryl Lian-Li Poon, John Wei-Ming Tan, Ross Alan Clark, Jennifer Suet-Ching Liaw, Hwei-Chi Chong
Background: older adults with total knee arthroplasty (TKA) frequently undergo rehabilitation to address limited knee flexion range-of-motion, quadriceps weakness and gait speed limitations. This study aimed to develop age- and sex-specific recovery curves of knee flexion range-of-motion, quadriceps strength and fast gait speed post-TKA. Methods: a population-based sample of 2,987 patients undergoing primary TKA participated, of whom 2015 (68%) were 65 years of age or older...
August 30, 2017: Age and Ageing
https://www.readbyqxmd.com/read/28984049/mir-422a-suppresses-smad4-protein-expression-and-promotes-resistance-to-muscle-loss
#18
Richard Paul, Jen Lee, Anna V Donaldson, Martin Connolly, Mohammad Sharif, Samantha Amanda Natanek, Ulrich Rosendahl, Michael I Polkey, Mark Griffiths, Paul R Kemp
BACKGROUND: Loss of muscle mass and strength are important sequelae of chronic disease, but the response of individuals is remarkably variable, suggesting important genetic and epigenetic modulators of muscle homeostasis. Such factors are likely to modify the activity of pathways that regulate wasting, but to date, few such factors have been identified. METHODS: The effect of miR-422a on SMAD4 expression and transforming growth factor (TGF)-β signalling were determined by western blotting and luciferase assay...
October 6, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28983413/correlations-between-ultrasonographic-findings-clinical-scores-and-depression-in-patients-with-knee-osteoarthritis
#19
Samia M Abd El Monaem, Nashwa Ismail Hashaad, Noha Hosni Ibrahim
OBJECTIVE: This study aimed to explore correlations between the presence of depression, clinical scores, and ultrasonographic (US) grading in osteoarthritis (OA) patients and to clarify if depressive symptoms might cause a discrepancy between US findings and clinical scores. MATERIAL AND METHODS: Two hundred patients with primary knee OA and 100 healthy hospital volunteers of the same age and sex not complaining of knee troubles participated in this study. We evaluated depressive symptoms in all participants using the Beck Depression Inventory (BDI) scale...
September 2017: European Journal of Rheumatology
https://www.readbyqxmd.com/read/28979857/osteoarthritis-action-alliance-consensus-opinion-best-practice-features-of-anterior-cruciate-ligament-and-lower-limb-injury-prevention-programs
#20
Thomas Trojian, Jeffrey Driban, Rathna Nuti, Lindsay Distefano, Hayley Root, Cristina Nistler, Cynthia LaBella
AIM: To identify best practice features of an anterior cruciate ligament (ACL) and lower limb injury prevention programs (IPPs) to reduce osteoarthritis (OA). METHODS: This consensus statement started with us performing a systematic literature search for all relevant articles from 1960 through January 2017 in PubMed, Web of Science and CINAHL. The search strategy combined the Medical Subject Heading (MeSH) and keywords for terms: (1) ACL OR "knee injury" OR "anterior cruciate ligament"; (2) "prevention and control" OR "risk reduction" OR "injury prevention" OR "neuromuscular training"; and (3) meta-analysis OR "systematic review" OR "cohort study" OR randomized...
September 18, 2017: World Journal of Orthopedics
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