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Quadriceps activation

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https://www.readbyqxmd.com/read/28527013/central-activation-metabolites-and-calcium-handling-during-fatigue-with-repeated-maximal-isometric-contractions-in-human-muscle
#1
Simeon P Cairns, Luke A G Inman, Caroline P MacManus, Ingrid G L van de Port, Patricia A Ruell, Jeanette M Thom, Martin W Thompson
PURPOSE: To determine the roles of calcium (Ca(2+)) handling by sarcoplasmic reticulum (SR) and central activation impairment (i.e., central fatigue) during fatigue with repeated maximal voluntary isometric contractions (MVC) in human muscles. METHODS: Contractile performance was assessed during 3 min of repeated MVCs (7-s contraction, 3-s rest, n = 17). In ten participants, in vitro SR Ca(2+)-handling, metabolites, and fibre-type composition were quantified in biopsy samples from quadriceps muscle, along with plasma venous [K(+)]...
May 19, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28526090/reduced-hdac2-in-skeletal-muscle-of-copd-patients
#2
Masako To, Elisabeth B Swallow, Kenich Akashi, Kosuke Haruki, S Amanda Natanek, Michael I Polkey, Kazuhiro Ito, Peter J Barnes
BACKGROUND: Skeletal muscle weakness in chronic obstructive pulmonary disease (COPD) is an important predictor of poor prognosis, but the molecular mechanisms of muscle weakness in COPD have not been fully elucidated. The aim of this study was to investigate the role of histone deacetylases(HDAC) in skeletal muscle weakness in COPD. METHODS AND RESULTS: Twelve COPD patients, 8 smokers without COPD (SM) and 4 healthy non-smokers (NS) were recruited to the study. HDAC2 protein expression in quadriceps muscle biopsies of COPD patients (HDAC2/β-actin: 0...
May 19, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28513275/relationship-between-lower-extremity-strength-and-subjective-function-in-individuals-with-patellofemoral-pain
#3
Neal R Glaviano, Susan Saliba
OBJECTIVE: Evaluate the relationship between subjective knee function and lower extremity strength in individuals with patellofemoral pain(PFP). DESIGN: Cohort. SETTING: Laboratory. PARTICIPANTS: Participants were 30 individuals with PFP (20 females, 10 males; 76.02±17.88kg, 173.04±7.58cm, 24.9±7years). MAIN OUTCOME MEASURES: Subjects completed the Activities of Daily Living Scale(ADLS) and had lower extremity hip and knee isometric strength assessed...
May 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28505208/neuromuscular-function-of-the-quadriceps-muscle-during-isometric-maximal-submaximal-and-submaximal-fatiguing-voluntary-contractions-in-knee-osteoarthrosis-patients
#4
Anett Mau-Moeller, Robert Jacksteit, Mario Jackszis, Frank Feldhege, Matthias Weippert, Wolfram Mittelmeier, Rainer Bader, Ralf Skripitz, Martin Behrens
INTRODUCTION: Knee osteoarthrosis (KOA) is commonly associated with a dysfunction of the quadriceps muscle which contributes to alterations in motor performance. The underlying neuromuscular mechanisms of muscle dysfunction are not fully understood. The main objective of this study was to analyze how KOA affects neuromuscular function of the quadriceps muscle during different contraction intensities. MATERIALS AND METHODS: The following parameters were assessed in 20 patients and 20 healthy controls: (i) joint position sense, i...
2017: PloS One
https://www.readbyqxmd.com/read/28500391/anterior-referencing-of-tibial-slope-in-total-knee-arthroplasty-considerably-influences-knee-kinematics-a-musculoskeletal-simulation-study
#5
Marco A Marra, Marta Strzelczak, Petra J C Heesterbeek, Sebastiaan A W van de Groes, Dennis W Janssen, Bart F J M Koopman, Ate B Wymenga, Nico J J Verdonschot
PURPOSE: In total knee arthroplasty (TKA), the posterior tibial slope is not always reconstructed correctly, and the knee ligaments may become too tight in flexion. To release a tight flexion gap, surgeons can increase the posterior tibial slope using two surgical resection techniques: the anterior tibial cortex (ACR) or the centre of tibial plateau (CPR) referencing. It is not known how this choice affects the knee laxity and function during activities of daily living. The aim of this study was to investigate the effect of tibial slope on knee laxity, kinematics and forces during a squatting activity using computer simulation techniques...
May 12, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28500081/quadriceps-strengthening-with-and-without-blood-flow-restriction-in-the-treatment-of-patellofemoral-pain-a-double-blind-randomised-trial
#6
Lachlan Giles, Kate E Webster, Jodie McClelland, Jill L Cook
BACKGROUND: Quadriceps strengthening exercises are part of the treatment of patellofemoral pain (PFP), but the heavy resistance exercises may aggravate knee pain. Blood flow restriction (BFR) training may provide a low-load quadriceps strengthening method to treat PFP. METHODS: Seventy-nine participants were randomly allocated to a standardised quadriceps strengthening (standard) or low-load BFR. Both groups performed 8 weeks of leg press and leg extension, the standard group at 70% of 1 repetition maximum (1RM) and the BFR group at 30% of 1RM...
May 12, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28489629/modulation-of-isometric-quadriceps-strength-in-soccer-players-with-transcranial-direct-current-stimulation-a-crossover-study
#7
Valentine Z Vargas, Abrahão F Baptista, Guilherme O C Pereira, Alberto C Pochini, Benno Ejnisman, Marcelo B Santos, Silvia M A João, Fuad A Hazime
The aim of this study was to evaluate the effect of transcranial direct current stimulation (tDCS) on the maximum isometric muscle contraction (MVIC) of the knee extensors in soccer players at the pre-professional level. Twenty female soccer players aged 15 to 17 years (mean = 16.1; SD = 0.9) with 5.2 ± 2.6 years of training were randomly divided into two groups to receive either active or sham tDCS in a single session (2 mA; 0.057mA/cm). The MVIC of the knee extensors was evaluated in both lower limbs by manual dynamometry in five sets of contractions divided into four blocks: (0) pre-stimulation, (1) during tDCS, (2) 30 minutes post-tDCS, and (3) 60 minutes post-tDCS...
May 9, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28488211/calf-augmentation-and-restoration-long-term-results-and-the-review-of-the-reported-complications
#8
Igor Niechajev, Christen Krag
BACKGROUND: Augmentation or reconstruction of the calves is indicated in patients with thin legs, for bodybuilders, or when there is a defect after an injury or illness. The principle of placing implants under the investing crural fascia was worked out in the 1980s. The senior author (I.N.) introduced many technical modifications and improvements for this operation, among them the new instrument, an inserter for the calf implants. Presented patient material is unique in that the more challenging reconstructive cases almost equal the numbers of the aesthetic cases...
May 9, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28482146/skeletal-muscle-fat-and-its-association-with-physical-function-in-rheumatoid-arthritis
#9
Samannaaz S Khoja, Charity G Moore, Bret H Goodpaster, Anthony Delitto, Sara R Piva
OBJECTIVE: To characterize skeletal muscle fat (SMF), intermuscular adipose tissue (IMAT) and subcutaneous adipose tissue (SAT) in individuals with rheumatoid arthritis (RA), and assess the associations between these fat depots and physical function and physical activity. METHODS: Cross-sectional analysis from an RA cohort. SMF, IMAT and SAT were measured using computed tomography imaging of the mid-thigh cross-sectional region. Physical function was measured with the Health Assessment Questionnaire (HAQ) and a battery of performance-based tests that included quadriceps muscle strength, gait speed, repeated chair-stands, stair ascend, and single leg-stance...
May 8, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28479954/the-effect-of-high-intensity-interval-run-training-on-cross-sectional-area-of-the-vastus-lateralis-in-untrained-college-students
#10
Rebekah R Estes, Amy Malinowski, Meredith Piacentini, David Thrush, Eric Salley, Cassidy Losey, Erik Hayes
Aerobic cycling has been repeatedly shown to induce hypertrophy in skeletal muscle across a variety of populations, while there has been a lack of investigation into the impact of running upon hypertrophy. An increasingly popular model of aerobic exercise is high-intensity interval training (HIIT); in addition to its positive impact upon cardiovascular health, HIIT may be sufficient for inducing significant muscular hypertrophy. Therefore, the purpose of this investigation was to examine the influence of a high-intensity interval running protocol upon hypertrophy of the vastus lateralis in an untrained, young population...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28477270/there-is-no-difference-between-quadriceps-and-hamstring-tendon-autografts-in-primary-anterior-cruciate-ligament-reconstruction-a-2-year-patient-reported%C3%A2-outcome-study
#11
Armin Runer, Guido Wierer, Elmar Herbst, Caroline Hepperger, Mirco Herbort, Peter Gföller, Christian Hoser, Christian Fink
PURPOSE: Graft choice for anterior cruciate ligament (ACL) reconstruction is crucial, however the optimal graft source remains a topic of controversy. The purpose of this study is to compare subjective and functional patient-reported outcomes (PRO) after single-bundle ACL reconstruction using quadriceps tendon (QT) or hamstring tendon (HT) autografts for single-bundle ACL reconstruction. We hypothesize that there is no difference in patient-reported functional outcomes after ACL reconstruction using either HT- or QT autograft...
May 5, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28469748/plasma-actin-gelsolin-and-orosomucoid-levels-after-eccentric-exercise
#12
Éva Tékus, Márk Váczi, Zoltán Horváth-Szalai, Andrea Ludány, Tamás Kőszegi, Márta Wilhelm
The present study investigated the acute effect of eccentric exercise on blood plasma actin, gelsolin (GSN) and orosomucoid (AGP) levels in untrained and moderately trained individuals, and their correlation with exercise induced muscle damage (EIMD) markers (CK, intensity of muscle soreness and maximal voluntary contraction torque deficit). Healthy physical education students (6 untrained, 12 moderately trained) participated in this research. Actin, GSN, AGP and CK levels were measured in blood plasma at baseline, immediately, 1 h, 6 h and 24 h post-exercise comprising 90 eccentric quadriceps contractions performed on a dynamometer...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28459795/four-weeks-of-nordic-hamstring-exercise-reduce-muscle-injury-risk-factors-in-young-adults
#13
João Breno de A R Alvares, Vanessa Bernardes Marques, Marco Aurélio Vaz, Bruno Manfredini Baroni
The Nordic hamstring exercise (NHE) is a field-based exercise designed for knee-flexor eccentric strengthening, aimed at muscle strains prevention. However, possible effects of NHE programmes on other hamstring injury risk factors remain unclear. The purpose of this study was to investigate the effects of a NHE training programme on multiple hamstring injury risk factors. Twenty physically active young adults were allocated into two equal sized groups: control group (CG) and training group (TG). The TG was engaged in a 4-week NHE programme, twice a week, 3 sets of 6-10 repetitions; while CG received no exercise intervention...
April 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28456776/effect-of-sprint-cycling-and-stretch-shortening-cycle-exercises-on-the-neuromuscular-immune-and-stress-indicators-in-young-men
#14
V Verbickas, N Baranauskiene, N Eimantas, S Kamandulis, S Rutkauskas, D Satkunskiene, S Sadauskas, M Brazaitis, A Skurvydas
Selection of optimal physical load is essential for desired adaptation including health benefits. We hypothesized that neuromuscular, immune and stress indicators will be higher after energy demanding sprint interval exercise (SIE) than to mechanically demanding stretch-shortening cycle exercise (SSE). The main aim of this study was to assess and compare the kinetics of blood brain-derived neurotrophic factor (BDNF), norepinephrine (NE) and cortisol (as stress indicators) and proinflammatory (IL-6) and anti-inflammatory (IL-10) cytokines within 24 hours after metabolically demanding SIE and after muscle damage inducing SSE...
February 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28455629/validation-of-an-active-shape-model-based-semi-automated-segmentation-algorithm-for-the-analysis-of-thigh-muscle-and-adipose-tissue-cross-sectional-areas
#15
Jana Kemnitz, Felix Eckstein, Adam G Culvenor, Anja Ruhdorfer, Torben Dannhauer, Susanne Ring-Dimitriou, Alexandra M Sänger, Wolfgang Wirth
OBJECTIVE: To validate a semi-automated method for thigh muscle and adipose tissue cross-sectional area (CSA) segmentation from MRI. MATERIALS AND METHODS: An active shape model (ASM) was trained using 113 MRI CSAs from the Osteoarthritis Initiative (OAI) and combined with an active contour model and thresholding-based post-processing steps. This method was applied to 20 other MRIs from the OAI and to baseline and follow-up MRIs from a 12-week lower-limb strengthening or endurance training intervention (n = 35 females)...
April 28, 2017: Magma
https://www.readbyqxmd.com/read/28452077/structure-and-function-of-human-muscle-fibres-and-muscle-proteome-in-physically-active-older-men
#16
Lorenza Brocca, Jamie S McPhee, Emanuela Longa, Monica Canepari, Olivier Seynnes, Giuseppe De Vito, Maria Antonietta Pellegrino, Marco Narici, Roberto Bottinelli
Contradictory results have been reported on the impact of ageing on structure and functions of skeletal muscle fibres likely due to complex interplay between ageing and other phenomena such as disuse and diseases. Here we recruited healthy, physically and socially active young (YO) and elderly (EL) men in order to study aging per se without the confounding effects of impaired physical function. In vivo analyses of quadriceps and in vitro analyses of vastus lateralis muscle biopsies were performed. In EL subjects, our results show that: (i) quadriceps volume, maximum voluntary torque (MVC), and patellar tendon force (Ft) were significantly lower; (ii) muscle fibres went through significant atrophy and impairment of specific force (Po/CSA) and unloaded shortening velocity (Vo); (iii) myosin/actin ratio and myosin content in individual muscle fibres were not altered; (iv) muscle proteome went through quantitative adaptations, namely an up-regulation of the content of several groups of proteins among which myofibrillar proteins and antioxidant defence systems; (v) muscle proteome went through qualitative adaptations, namely phosphorylation of several proteins, including Myosin Light Chain-2 slow and Troponin T and carbonylation of Myosin Heavy Chains...
April 27, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28445875/double-incision-approach-and-early-rehabilitation-in-a-complicated-bicondylar-br-tibial-plateau-fracture-a-case-report-br-br
#17
Saverio Affatato, Maurizio Montalti, Claudio Masetti, Federico Giardina, Alessandra Sudanese
OBJECTIVE: The main goal of this case was to report the treatment of bicondylar fractures of the tibial plateau and the restoration of the metaphyseo-diaphyseal dissociation. CLINICAL PRESENTATION AND INTERVENTION: A 54-year old man who was cycling had a road accident that caused a closed fracture of the right tibial plateau and proximal fibula diagnosed by x-rays. Patient had surgical procedure and was immobilized with a long-leg splint for 4 weeks. After immobilization, aggressive rehabilitation was done...
April 26, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/28444436/acute-effects-of-static-stretching-on-muscle-tendon-mechanics-of-quadriceps-and-plantar-flexor-muscles
#18
Tom Bouvier, Jules Opplert, Carole Cometti, Nicolas Babault
PURPOSE: This study aimed to determine the acute effects of static stretching on stiffness indexes of two muscle groups with a contrasting difference in muscle-tendon proportion. METHODS: Eleven active males were tested on an isokinetic dynamometer during four sessions randomly presented. Two sessions were dedicated to quadriceps and the two others to triceps surae muscles. Before and immediately after the stretching procedure (5 × 30 s), gastrocnemius medialis and rectus femoris fascicle length and myotendinous junction elongation were determined using ultrasonography...
April 25, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28442076/exercise-training-for-people-following-curative-intent-treatment-for-non-small-cell-lung-cancer-a-randomized-controlled-trial
#19
Vinicius Cavalheri, Sue Jenkins, Nola Cecins, Kevin Gain, Martin J Phillips, Lucas H Sanders, Kylie Hill
OBJECTIVE: In people following curative intent treatment for non-small cell lung cancer, to investigate the effects of supervised exercise training on exercise capacity, physical activity and sedentary behavior, peripheral muscle force, health-related quality of life, fatigue, feelings of anxiety and depression, and lung function. METHOD: This pilot randomized controlled trial included participants 6-10 weeks after lobectomy for non-small cell lung cancer or, for those who required adjuvant chemotherapy, 4-8 weeks after their last cycle...
January 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28437676/superior-inferior-position-of-patellar-component-affects-patellofemoral-kinematics-and-contact-forces-in-computer-simulation
#20
Shinichiro Nakamura, Yoshihisa Tanaka, Shinichi Kuriyama, Kohei Nishitani, Hiromu Ito, Moritoshi Furu, Shuichi Matsuda
BACKGROUND: Anterior knee pain has been reported as a major postoperative complication after total knee arthroplasty, which may lead to patient dissatisfaction. Rotational alignment and the medial-lateral position correlate with patellar maltracking, which can cause knee pain postoperatively. However, the superior-inferior position of the patellar component has not been investigated. The purpose of the current study was to investigate the effects of the patellar superior-inferior position on patellofemoral kinematics and kinetics...
June 2017: Clinical Biomechanics
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