keyword
MENU ▼
Read by QxMD icon Read
search

Muscle activation knee

keyword
https://www.readbyqxmd.com/read/28078451/slower-but-not-faster-unilateral-fatiguing-knee-extensions-alter-contralateral-limb-performance-without-impairment-of-maximal-torque-output
#1
Olaf Prieske, Saied J Aboodarda, José A Benitez Sierra, David G Behm, Urs Granacher
PURPOSE: The purpose of the present study was to examine the effects of unilateral fatigue of the knee extensors at different movement velocities on neuromuscular performance in the fatigued and non-fatigued leg. METHODS: Unilateral fatigue of the knee extensors was induced in 11 healthy young men (23.7 ± 3.8 years) at slower (60°/s; FAT60) and faster movement velocities (240°/s; FAT240) using an isokinetic dynamometer. A resting control (CON) condition was included...
January 11, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28078435/the-effects-of-therapeutic-exercises-on-pain-muscle-strength-functional-capacity-balance-and-hemodynamic-parameters-in-knee-osteoarthritis-patients-a-randomized-controlled-study-of-supervised-versus-home-exercises
#2
Tuğba Kuru Çolak, Bahar Kavlak, Onur Aydoğdu, Emir Şahin, Gönül Acar, İlkşan Demirbüken, Zübeyir Sarı, İlker Çolak, Güven Bulut, M Gülden Polat
The aim of the study was to compare the effects of low-intensity exercise programs for lower extremities, either supervised or at home, on pain, muscle strength, balance and the hemodynamic parameters of knee osteoarthritis (OA) patients. This randomized study included 78 patients with knee OA in 2 groups of supervised and home-based exercise program. Exercises were applied to the first group in the clinic as a group exercise program and were demonstrated to the second group to be performed at home. Before and after the 6-week exercise program, assessment was made of pain, quadriceps and hamstring muscle strengths, 6-min walk test (6MWT), and non-invasive hemodynamic parameters...
January 11, 2017: Rheumatology International
https://www.readbyqxmd.com/read/28077395/the-effects-of-posterior-cruciate-ligament-deficiency-on-posterolateral-corner-structures-under-gait-and-squat-loading-conditions-a-computational-knee-model
#3
K-T Kang, Y-G Koh, M Jung, J-H Nam, J Son, Y H Lee, S-J Kim, S-H Kim
OBJECTIVES: The aim of the current study was to analyse the effects of posterior cruciate ligament (PCL) deficiency on forces of the posterolateral corner structure and on tibiofemoral (TF) and patellofemoral (PF) contact force under dynamic-loading conditions. METHODS: A subject-specific knee model was validated using a passive flexion experiment, electromyography data, muscle activation, and previous experimental studies. The simulation was performed on the musculoskeletal models with and without PCL deficiency using a novel force-dependent kinematics method under gait- and squat-loading conditions, followed by probabilistic analysis for material uncertain to be considered...
January 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28063935/effects-of-spinal-cord-stimulation-on-motor-functions-in-children-with-cerebral-palsy
#4
I A Solopova, I A Sukhotina, D S Zhvansky, G A Ikoeva, S V Vissarionov, A G Baindurashvili, V R Edgerton, Y P Gerasimenko, T R Moshonkina
Is it possible to regulate the functional properties of abnormally developed spinal neuronal locomotor networks using transcutaneous spinal cord stimulation? This question has been studied in twenty-eight participants (∼9 yrs) with spastic cerebral palsy, and mainly Gross Motor Function Classification System for Cerebral Palsy level III. The participants were randomly assigned to two groups. The experimental group received transcutaneous spinal cord stimulation at two spinal levels (below T11 and L1 spinous processes), combined with locomotor treadmill training, whereas the participants of the control group received locomotor treadmill training only...
January 4, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28060035/etiology-and-recovery-of-neuromuscular-fatigue-following-simulated-soccer-match-play
#5
Kevin Thomas, Jack Dent, Glyn Howatson, Stuart Goodall
PURPOSE: We profiled the etiology and recovery of neuromuscular fatigue post-simulated-soccer-match-play. METHODS: Fifteen semi-professional players completed a 90 min simulated soccer match. Pre-, immediately-post and at 24, 48 and 72 h participants completed a battery of neuromuscular, physical and perceptual tests. Perceived fatigue and muscle soreness were assessed via visual analogue scales. Maximum voluntary contraction (MVC) and twitch responses to electrical (femoral nerve) and magnetic (motor cortex) stimulation during isometric knee-extensor contractions and at rest were measured to assess central (voluntary activation, VA) and peripheral (quadriceps potentiated twitch force, Qtw,pot) fatigue, and responses to single and paired-magnetic stimuli were assessed to quantify corticospinal excitability and short-intracortical inhibition (SICI), respectively...
January 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28057348/lower-extremity-control-during-turns-initiated-with-and-without-hip-external-rotation
#6
Antonia M Zaferiou, Henryk Flashner, Rand R Wilcox, Jill L McNitt-Gray
The pirouette turn is often initiated in neutral and externally rotated hip positions by dancers. This provides an opportunity to investigate how dancers satisfy the same mechanical objectives at the whole-body level when using different leg kinematics. The purpose of this study was to compare lower extremity control strategies during the turn initiation phase of pirouettes performed with and without hip external rotation. Skilled dancers (n=5) performed pirouette turns with and without hip external rotation...
December 29, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28054322/creatine-loading-does-not-preserve-muscle-mass-or-strength-during-leg-immobilization-in-healthy-young-males-a-randomized-controlled-trial
#7
Evelien M P Backx, Roland Hangelbroek, Tim Snijders, Marie-Louise Verscheijden, Lex B Verdijk, Lisette C P G M de Groot, Luc J C van Loon
BACKGROUND: A short period of leg immobilization leads to rapid loss of muscle mass and strength. Creatine supplementation has been shown to increase lean body mass in active individuals and can be used to augment gains in muscle mass and strength during prolonged resistance-type exercise training. OBJECTIVE: Our objective was to investigate whether creatine loading can attenuate the loss of muscle mass and strength during short-term leg immobilization. METHODS: Healthy young men (n = 30; aged 23 ± 1 years; body mass index [BMI] 23...
January 5, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28053820/effects-of-different-concurrent-resistance-and-aerobic-training-frequencies-on-muscle-power-and-muscle-quality-in-trained-elderly-men-a-randomized-clinical-trial
#8
Rodrigo Ferrari, Sandra C Fuchs, Luiz Fernando Martins Kruel, Eduardo Lusa Cadore, Cristine Lima Alberton, Ronei Silveira Pinto, Régis Radaelli, Maira Schoenell, Mikel Izquierdo, Hirofumi Tanaka, Daniel Umpierre
Muscle power is a strong predictor of functional status in the elderly population and is required to perform different daily activities. To compare the effects of different weekly training frequencies on muscle power and muscle quality induced by concurrent training (resistance + aerobic) in previously trained elderly men. Twenty-four trained elderly men (65 ± 4 years), previously engaged in a regular concurrent training program, three times per week, for the previous five months, were randomly allocated to concurrent training programs in which training was performed either twice a week (2·week(-1), n = 12) or three times per week (3·week(-1), n = 12)...
December 2016: Aging and Disease
https://www.readbyqxmd.com/read/28051342/effects-of-thermal-agent-and-physical-activity-on-muscle-tendon-stiffness-and-effects-combined-with-static-stretching
#9
Kosuke Fujita, Masatoshi Nakamura, Hiroki Umegaki, Takuya Kobayashi, Satoru Nishishita, Hiroki Tanaka, Satoko Ibuki, Noriaki Ichihashi
CONTEXT: A recent review or article reported that thermal agents (TA) or physical activity (PA) can increase range of motion (ROM), and that the combination of TA with stretching is superior to performing stretching only. However, since ROM is affected by the participants' psychological factors, it is questionable whether these studies measured the effect of these intervention on muscle flexibility. By measuring muscle stiffness, we attempted to evaluate the effect these intervention on muscle flexibility...
January 4, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28050572/comparison-of-a-novel-weightbearing-cone-beam-computed-tomography-scanner-versus-a-conventional-computed-tomography-scanner-for-measuring-patellar-instability
#10
John Marzo, Melissa Kluczynski, Anthony Notino, Leslie Bisson
BACKGROUND: Conventional computed tomography (CT) images are routinely used for diagnosing patellofemoral instability and are obtained with the patient in a supine position, nonweightbearing, with the knee in full extension, and with leg muscles relaxed. A new portable extremity cone beam CT (CBCT) scanner has been developed that may allow for more accurate diagnosis, as imaging can be performed with the patient standing, the knee flexed, and with leg muscles active. PURPOSE/HYPOTHESIS: The purpose of this study was to compare CT measurements of patellar alignment on a prototype scanner versus conventional scanner in patients with known patellar instability...
December 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28050533/total-ruptures-of-the-extensor-apparatus-of-the-knee
#11
Diogo Moura, Fernando Fonseca
OBJECTIVE: This was a retrospective case-control study on total ruptures of the extensor apparatus of the knee, aimed to compare patella fractures with tendinous ruptures. METHODS: The sample included 190 patients and 198 total ruptures of the knee extensor apparatus. All patients were evaluated by the same examiner after a minimum one-year follow-up. RESULTS: Tendinous ruptures occurred most frequently in men, in younger patients, and had better clinical and functional outcomes when compared with patella fractures; however, the former presented higher levels of thigh atrophy...
November 2016: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28049446/a-cross-sectional-study-of-the-association-between-dynapenia-and-higher-level-functional-capacity-in-daily-living-in-community-dwelling-older-adults-in-japan
#12
Masaki Iwamura, Masao Kanauchi
BACKGROUND: There are many reports that dynapenia, sarcopenia and frailty each have associations with bodily function or with Instrumental Activities of Daily Living (IADL). However, studies that compare all three conditions and their effects on IADL are lacking. The purpose of this study is to examine associations of sarcopenia, frailty, and dynapenia with IADL. METHODS: Participants included 123 community-dwelling older adults (31 men, 92 women,) aged 65 years or older (75...
January 3, 2017: BMC Geriatrics
https://www.readbyqxmd.com/read/28044357/effect-of-aging-on-region-specific-functional-role-and-muscle-geometry-along-human-rectus-femoris-muscle
#13
Kohei Watanabe, Motoki Kouzaki, Toshio Moritani
Introduction We compared the region-specific neuromuscular activation and muscle morphology along the rectus femoris (RF) muscle between young and elderly. Methods Ratios of surface electromyography amplitude between hip flexion and knee extension (HF/KE) were compared among regions along the muscle for nine young and nine elderly men. The muscle thickness was also compared among the regions. Results HF/KE in the proximal region was significantly greater than in the middle and distal regions for both the young and elderly (p < 0...
January 3, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28040567/effects-of-age-and-sex-on-fatigability-and-recovery-from-a-sustained-maximal-isometric-voluntary-contraction
#14
Rima Solianik, Lina Kreivėnaitė, Vytautas Streckis, Dalia Mickevičienė, Albertas Skurvydas
The aim was to assess the effects of sex and age on fatigability and recovery from sustained maximal voluntary contraction (MVC) of the knee extensor muscles. The central (central activation ratio (CAR) and electrical activity amplitude) and peripheral (electrically evoked torque and muscle contractile properties) factors contributing to fatigue and recovery of 24 young adults (12 males) aged 23.2±3.6years and 20 older adults (12 males) aged 70.6±4.4years were compared. The increase in central and peripheral fatigue was greater (p⩽0...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28039429/limited-potential-of-genetic-predisposition-scores-to-predict-muscle-mass-and-strength-performance-in-flemish-caucasians-between-19-73-years-of-age
#15
Ruben Charlier, Maarten Caspers, Sara Knaeps, Evelien Mertens, Diether Lambrechts, Johan Lefevre, Martine Thomis
Since both muscle mass and strength performance are polygenic in nature, the current study compared four Genetic Predisposition Scores (GPS) in their ability to predict these phenotypes. Data were gathered within the framework of the first generation Flemish Policy Research Centre 'Sport, Physical Activity and Health' (2002-2004). Results are based on muscle characteristics data of 565 Flemish Caucasians (19-73 yr, 365 men). Skeletal muscle mass (SMM) was determined using bioelectrical impedance. The Biodex dynamometer was used to measure isometric (PTstatic120°) and isokinetic strength (PTdynamic60° and PTdynamic240°), ballistic movement speed (S20%) and muscular endurance (Work) of the knee extensors...
December 30, 2016: Physiological Genomics
https://www.readbyqxmd.com/read/28038376/lean-muscle-volume-of-the-thigh-has-a-stronger-relationship-with-muscle-power-than-muscle-strength-in-women-with-knee-osteoarthritis
#16
Michael J Davison, Monica R Maly, Peter J Keir, Sandani M Hapuhennedige, Amie T Kron, Jonathan D Adachi, Karen A Beattie
BACKGROUND: Thigh lean muscle and intramuscular fat have been implicated in the impairment of physical function observed in people with knee osteoarthritis. We investigated the relationships of quadriceps and hamstrings intramuscular fat fraction and lean muscle volume with muscle power and strength, controlling for neuromuscular activation, and physical performance in women with knee OA. METHODS: Women (n=20) 55years or older with symptomatic, radiographic knee osteoarthritis underwent a 3...
November 25, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/28029798/should-the-ipsilateral-hamstrings-be-used-for-anterior-cruciate-ligament-reconstruction-in-the-case-of-medial-collateral-ligament-insufficiency
#17
Mirco Herbort, Philipp Michel, Michael J Raschke, Nils Vogel, Martin Schulze, Alexander Zoll, Christian Fink, Wolf Petersen, Christoph Domnick
BACKGROUND: Semitendinosus and gracilis muscles are frequently harvested for autologous tendon grafts for cruciate ligament reconstruction. This study investigated the joint-stabilizing effects of these hamstring muscles in cases of insufficiency of the medial collateral ligament (MCL). HYPOTHESES: First, both the semitendinosus and gracilis muscles can actively stabilize the joint against valgus moments in the MCL-deficient knee. Second, the stabilizing influence of these muscles decreases with an increasing knee flexion angle...
December 1, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28029696/vastus-medialis-and-lateralis-activity-during-voluntary-and-stimulated-contractions
#18
Rosa M S Visscher, Diego Rossi, Bernd Friesenbichler, Markus Dohm-Acker, Thomas Rosenheck, Nicola A Maffiuletti
INTRODUCTION: The purpose of this study was to investigate the relative activation of vastus medialis (VM) and vastus lateralis (VL) muscles during voluntary and stimulated isometric contractions at different joint angles. METHODS: Sixteen healthy men (mean age: 26 years) completed maximal voluntary and stimulated contractions of the knee extensor muscles at 30°, 65°, and 100° of knee flexion. VM/VL ratios were calculated from voluntary EMG and evoked torque recordings...
December 28, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/28028870/neuromuscular-performance-of-maximal-voluntary-explosive-concentric-contractions-is-influenced-by-angular-acceleration
#19
D Hahn, P Bakenecker, F Zinke
Torque production during maximal voluntary explosive contractions is considered to be a functionally more relevant neuromuscular measure than steady-state torque, but little is known about accelerated concentric contractions. This study investigated torque, muscle activity, and fascicle behavior during isometric and fast concentric contractions of quadriceps femoris. Ten participants performed maximal voluntary explosive isometric, isovelocity, and additional concentric knee extensions at angular accelerations ranging from 700 to 4000° s(-2) that resulted in an angular velocity of 300° s(-1) at 40° knee flexion...
December 28, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28027463/quantifying-knee-mechanics-during-balance-training-exercises
#20
Lauren C Benson, Thomas G Almonroeder, Kristian M O'Connor
Patellofemoral pain (PFP) is common among runners and those recovering from anterior cruciate ligament reconstruction. Training programs designed to prevent or treat injuries often include balance training, although balance interventions have been reported to coincide with more knee injuries. Knowledge of the effect of balance exercises on knee mechanics may be useful when designing training programs. High knee abduction moment has been implicated in the development of PFP, and imbalance between vastus lateralis (VL) and vastus medialis oblique (VMO) may contribute to patellofemoral stress...
December 24, 2016: Human Movement Science
keyword
keyword
64264
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"