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Quadriceps activation

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https://www.readbyqxmd.com/read/29141879/lower-limb-biomechanical-analysis-during-an-unanticipated-step-on-a-bump-reveals-specific-adaptations-of-walking-on-uneven-terrains
#1
Fausto A Panizzolo, Sangjun Lee, Taira Miyatake, Denise Martineli Rossi, Christopher Siviy, Jozefien Speeckaert, Ignacio Galiana, Conor J Walsh
Although it is clear that walking over different irregular terrain is associated with altered biomechanics, there is little understanding of how we quickly adapt to unexpected variations in terrain. This study aims to investigate which adaptive strategies humans adopt when performing an unanticipated step on an irregular surface, specifically a small bump. Nine healthy male participants walked at their preferred walking speed along a straight walkway during five conditions: four involving unanticipated bumps of two different heights, and one level walking condition...
November 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29132243/protective-effects-of-estradiol-and-dihydrotestosterone-following-spinal-cord-injury
#2
Dale R Sengelaub, Qi Han, Nai-Kui Liu, Melissa Maczuga, Violetta Szalavari, Stephanie Valencia, Xiao-Ming Xu
Spinal cord injury (SCI) results in lesions that destroy tissue and disrupt spinal tracts, producing deficits in locomotor and autonomic function. We previously demonstrated that motoneurons, and the muscles they innervate, show pronounced atrophy after SCI, and these changes are prevented by treatment with testosterone. Here we assessed if the testosterone active metabolites, estradiol and dihydrotestosterone, have similar protective effects after SCI. Young adult female rats received either sham or T9 spinal cord contusion injuries and were treated with estradiol, dihydrotestosterone, both, or nothing via Silastic capsules...
November 13, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29117071/deception-improves-tt-performance-in-well-trained-cyclists-without-augmented-fatigue
#3
Paul Ansdell, Kevin Thomas, Glyn Howatson, Markus Amann, Stuart Goodall
PURPOSE: To investigate the effects of feedback, in the form of a virtual avatar paced at 100 and 102% of baseline performance, on neuromuscular fatigue following a 4 km cycling time trial (TT). We hypothesised that improved cycling performance would occur due to participants exceeding a previously established critical threshold, and experiencing greater neuromuscular fatigue. METHODS: Following familiarisation, ten well-trained cyclists performed a baseline 4 km TT without feedback (BASE), followed by two, 4 km TT where they raced against an avatar (set at 100% [accurate - ACC] and 102% [deception - DEC] of baseline power output), in a randomised and counterbalanced order...
November 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29116386/clinical-and-ultrasonographic-enthesopathy-in-inflammatory-rheumatic-diseases-is-masei-or-only-calcaneal-enthesitis-sufficient
#4
Ekrem Süleyman, Kemal Nas, Halil Harman, Nedim Kaban
AIM: We aimed at investigating the ultrasonographic (US) and clinical prevalence of enthesopathy in patients with rheumatoid arthritis (RA), and axial spondyloarthropathy (SpA), as well as the correlation between this condition and disease activity, along with the quality of life. METHODS: Included in the study were 30 axial SpA, 21 patients with RA, and 25 healthy cases. Bath Anklylosing Spondylitis Disease Activity Index (BASDAI), Ankylosing Spondylitis Quality of Life (ASQoL), Disease activity index  28 (DAS28), and Health Assessment Questionnaire (HAQ) were used for clinical evaluation, and enthesal pain was evaluated by VAS, whereas enthesitis US evaluation was performed by using the MAdrid Sonographic Enthesitis Index (MASEI)...
November 7, 2017: Zeitschrift Für Rheumatologie
https://www.readbyqxmd.com/read/29114563/risk-factors-for-lower-extremity-overuse-injuries-in-female-youth-soccer-players
#5
John W O'Kane, Moni Neradilek, Nayak Polissar, Lori Sabado, Allan Tencer, Melissa A Schiff
Background: Youth soccer injuries are common and of increasing concern, with sport specialization occurring at younger ages. Limited research is available regarding overuse injuries and risk factors in young female athletes. Purpose: To identify the number and rate of overuse injuries in female soccer players (ages 12-15 years), describe the anatomic location and type of injury, and evaluate contributing risk factors. Study Design: Case-control study; Level of evidence, 3...
October 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29113570/a-novel-downhill-gait-training-program-following-a-total-knee-arthroplasty-a-case-report-highlighting-the-impacts-of-self-selected-speed-on-gait-symmetry
#6
Cody Blue, Sara Coomes, Yuri Yoshida
Study Design Case report. Background Walking plays an essential role in activities of daily living that lead to varied health benefits. Studies report gait speed and symmetry are impacted in individuals following TKA. Unfortunately, abnormal gait patterns persistently exist in individuals after TKA. Downhill walking may provide a simple and feasible exercise regimen to improve gait patterns. The purpose of this case report is to describe the application of a downhill treadmill training program and the subsequent changes in gait patterns in an individual following a unilateral TKA...
November 7, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29112627/impact-of-blood-flow-restriction-exercise-on-muscle-fatigue-development-and-recovery
#7
Florian Husmann, Thomas Mittlmeier, Sven Bruhn, Volker Zschorlich, Martin Behrens
PURPOSE: The present study was designed to provide mechanistic insight into the time-course and etiology of muscle fatigue development and recovery during and after low-intensity exercise when it is combined with blood flow restriction (BFR). METHODS: Seventeen resistance-trained males completed four sets of low-intensity isotonic resistance exercise under two experimental conditions: knee extension exercise combined with (i) BFR and (ii) without BFR (CON). Neuromuscular tests were performed before, during (immediately after each set of knee extension exercise) and 1, 2, 4, and 8 min after each experimental condition...
November 6, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29108230/apigenin-enhances-skeletal-muscle-hypertrophy-and-myoblast-differentiation-by-regulating-prmt7
#8
Young Jin Jang, Hyo Jeong Son, Yong Min Choi, Jiyun Ahn, Chang Hwa Jung, Tae Youl Ha
Apigenin, a natural flavone abundant in various plant-derived foods including parsley and celery, has been shown to prevent inflammation and inflammatory diseases. However, the effect of apigenin on skeletal muscle hypertrophy and myogenic differentiation has not previously been elucidated. Here, we investigated the effects of apigenin on quadricep muscle weight and running distance using C57BL/6 mice on an accelerating treadmill. Apigenin stimulated mRNA expression of MHC (myosin heavy chain) 1, MHC2A, and MHC2B in the quadricep muscles of these animals...
October 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/29102877/different-fatigue-resistant-leg-muscles-and-emg-response-during-whole-body-vibration
#9
Deniz Simsek
The purpose of this study was to determine the effects of static whole-body vibration (WBV) on the Electromyograhic (EMG) responses of leg muscles, which are fatigue-resistant in different manner. The study population was divided into two groups according to the values obtained by the Fatigue Index [Group I: Less Fatigue Resistant (LFR), n=11; Group II: More Fatigue Resistant (MFR), n=11]. The repeated electromyographic (EMG) activities of four leg muscles were analyzed the following determinants: (1) frequency (30 Hz, 35 Hz and 40 Hz); (2) stance position (static squat position); (3) amplitude (2 mm and 4 mm) and (4) knee flexion angle (120°), (5) vertical vibration platform...
October 19, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29089749/relationship-of-quadriceps-muscle-power-and-optimal-shortening-velocity-with-angiotensin-converting-enzyme-activity-in-older-women
#10
Joanna Kostka, Joanna Sikora, Tomasz Kostka
BACKGROUND: The goal of this study was to assess whether angiotensin-converting enzyme (ACE) activity is related to muscle function (strength, power and velocity), as well as to assess if ACE inhibitors (ACEIs) and other angiotensin system blocking medications (ASBMs) influence muscle performance in elderly women. SUBJECTS AND METHODS: Ninety-five community-dwelling elderly women took part in this study. Anthropometric data, blood ACE activity analysis, maximum power (Pmax) and optimal shortening velocity (υopt) of the knee extensor muscles, handgrip strength, physical activity (PA) and functional performance were measured...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/29084391/the-effect-of-rolling-massage-on-the-excitability-of-the-corticospinal-pathway
#11
Saied J Aboodarda, Rebecca M Greene, Devin T Philpott, Ramandeep S Jaswal, Guillaume Y Millet, David G Behm
The aim of the present study was to investigate the alterations of corticospinal excitability (motor evoked potential, MEP) and inhibition (silent period, SP) following rolling massage of the quadriceps muscles. Transcranial magnetic and femoral nerve electrical stimuli were used to elicit MEPs and compound muscle action potential (Mmax) in the vastus lateralis and vastus medialis muscles prior to and following either: i) 4 sets of 90-s rolling massage (ROLLING) or ii) rest (CONTROL). One series of neuromuscular evaluations, performed after each set of ROLLING or CONTROL, included three MEPs and one Mmax elicited every 4 s during 15 s submaximal contractions at 10% (experiment 1, n = 16) and 50% (experiment 2, n = 10) of maximal voluntary knee extensions (MVC)...
October 30, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29083355/neuromuscular-recovery-in-acl-reconstruction-with-bone-tendon-patellar-bone-and-semitendinosus-gracilis-autograft
#12
Andrea Pasquini, Marco Jacopetti, Francesco Pogliacomi, Ileana Ramazzina, Cosimo Costantino
OBJECTIVE: Several different types of grafts have been used in ACL rupture. The purpose of the study was to compare the recovery of lower limbs muscle strength and proprioception in athletes, who underwent ACL reconstruction with Bone-Patellar-Tendon-Bone (BPTB) versus semitendinosus and gracilis (HS) autografts. METHODS: We enrolled 30 male amateur athletes. Each patient was evaluated by isokinetic test, triaxial accelerometer test and balance test with stabilometric platform...
October 18, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/29081870/fun-during-knee-rehabilitation-feasibility-and-acceptability-testing-of-a-new-android-based-training-device
#13
Thomas Sanjay Weber-Spickschen, Christian Colcuc, Alexander Hanke, Jan-Dierk Clausen, Paul Abraham James, Hauke Horstmann
PURPOSE: The initial goals of rehabilitation after knee injuries and operations are to achieve full knee extension and to activate quadriceps muscle. In addition to regular physiotherapy, an android-based knee training device is designed to help patients achieve these goals and improve compliance in the early rehabilitation period. This knee training device combines fun in a computer game with muscular training or rehabilitation. Our aim was to test the feasibility and acceptability of this new device...
2017: Open Medical Informatics Journal
https://www.readbyqxmd.com/read/29078808/treatment-with-the-anti-il-6-receptor-antibody-attenuates-muscular-dystrophy-via-promoting-skeletal-muscle-regeneration-in-dystrophin-utrophin-deficient-mice
#14
Eiji Wada, Jun Tanihata, Akira Iwamura, Shin'ichi Takeda, Yukiko K Hayashi, Ryoichi Matsuda
BACKGROUND: Chronic increases in the levels of the inflammatory cytokine interleukin-6 (IL-6) in serum and skeletal muscle are thought to contribute to the progression of muscular dystrophy. Dystrophin/utrophin double-knockout (dKO) mice develop a more severe and progressive muscular dystrophy than the mdx mice, the most common murine model of Duchenne muscular dystrophy (DMD). In particular, dKO mice have smaller body sizes and muscle diameters, and develop progressive kyphosis and fibrosis in skeletal and cardiac muscles...
October 27, 2017: Skeletal Muscle
https://www.readbyqxmd.com/read/29077216/no-difference-between-mechanical-perturbation-training-with-compliant-surface-and-manual-perturbation-training-on-knee-functional-performance-after-acl-rupture
#15
Zakariya Nawasreh, David Logerstedt, Mathew Failla, Lynn Snyder-Mackler
Manual perturbation training improves dynamic knee stability and functional performance after anterior cruciate ligament rupture (ACL-rupture). However, it is limited to static standing position and does not allow time-specific perturbations at different phase of functional activities. The purpose of this study was to investigate whether administering mechanical perturbation training including compliant surface provides effects similar to manual perturbation training on knee functional measures after an acute ACL-rupture...
October 27, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29071974/-effect-of-spleen-stomach-harmonizing-needling-on-insulin-resistance-and-expression-of-insulin-receptor-substrate-1-2-and-glucose-transporter-4-in-insulin-resistance-type-2-diabetes-rats
#16
Hong Chen, Zhi-Long Zhang, Xu Wang, Yuan-Qing Yang
OBJECTIVE: To observe the effect of manual acupuncture stimulation of "Quchi" (LI 11), "Hegu" (LI 4), "Zusanli" (ST 36), etc. with "spleen-stomach harmonizing" technique on insulin resistance index (ISI) and the expression of insulin receptor substrate-1 (IRS-1), IRS-2 (two upstream key proteins) and glucose transporter-4 (GluT-4, downstream key protein) of the phosphatidylinositol 3-kinase (PI 3 K)/Akt signaling pathway in insulin resistance type 2 diabetes (IRT 2 D) rats, so as to explore its mechanism underling improvement of type 2 diabetes...
June 25, 2017: Zhen Ci Yan Jiu, Acupuncture Research
https://www.readbyqxmd.com/read/29058269/muscle-strength-functional-endurance-and-health-related-quality-of-life-in-active-older-female-golfers
#17
Charlotte Buckley, Maria Stokes, Dinesh Samuel
BACKGROUND: Grip strength is a reliable predictor of whole body strength in older adults, but muscle characteristics of people with different activity levels have not been studied previously. The present study examined the relationship between grip strength (GS), quadriceps peak torque (QPT), functional endurance, and health-related quality of life (HRQoL) in older female golfers. METHODS: Twenty-nine healthy female golfers (mean age 69.1 years, SD 3.4) participated...
October 23, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/29040646/statins-affect-skeletal-muscle-performance-evidence-for-disturbances-in-energy-metabolism
#18
Neeltje A E Allard, Tom J J Schirris, Rebecca J Verheggen, Frans G M Russel, Richard J Rodenburg, Jan A M Smeitink, Paul D Thompson, Maria T E Hopman, Silvie Timmers
Context: Statin myopathy is linked to disturbances in mitochondrial function and exercise intolerance. Objectives: To determine whether differences exist in exercise performance, muscle function and mitochondrial oxidative capacity and content between symptomatic and asymptomatic statin users, and non-statin using controls. Design: Cross-sectional study. Setting: Department of Physiology of the Radboud University Medical Center...
October 9, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29040061/validation-of-a-novel-biomechanical-test-bench-for-the-knee-joint-with-six-degrees-of-freedom
#19
Christian H Heinrichs, Dominik Knierzinger, Hannes Stofferin, Werner Schmoelz
A novel biomechanical test bench has been developed for in-vitro evaluation of the knee joint. The test bench allows the kinematics of the knee joint to be studied in all six degrees of freedom. Flexion-extension knee movements are induced by quadriceps and hamstring muscle forces simulated by five pneumatic cylinders. The kinematics of the knee and the actively applied muscle forces are measured simultaneously. The aim of this study was to validate the sensitivity and reproducibility of this novel test bench...
October 17, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29037655/differences-in-pressure-pain-threshold-among-men-and-women-after-foam-rolling
#20
Scott W Cheatham, Russell Baker
BACKGROUND: Rehabilitation professionals often prescribe foam rolling as an intervention to augment other manual therapies or as a warm-up or recovery after athletic activity. Currently, there is a gap in the literature regarding how foam rolling effects the pressure pain threshold (PPT) among men and women. PURPOSE: The purpose of this study was to examine the immediate effects of a foam rolling intervention on the ipsilateral agonist, antagonist, and contralateral muscle group PPT among men and women...
October 2017: Journal of Bodywork and Movement Therapies
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