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hamstring muscle extensibility

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https://www.readbyqxmd.com/read/28324993/dynamic-knee-muscle-co-contraction-quantified-during-walking
#1
Annachiara Strazza, Alessandro Mengarelli, Valentina Agostini, Marco Knaflitz, Laura Burattini, Sandro Fioretti, Francesco Di Nardo
The purpose of the present study was the quantification of the co-activation patterns of the knee extensor and flexor muscles during walking at self-selected speed and cadence. To this aim, the Statistical Gait Analysis, a recent methodology providing a statistical characterization of gait, was performed on surface EMG signals from Vastus Lateralis (VL) and Medial Hamstrings (MH) in 14 healthy young adult subjects. Muscular co-contraction was assessed as the overlapping period between activation intervals of agonist and antagonist muscles...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28285012/two-stage-treatment-of-ischial-pressure-ulcers-in-spinal-cord-injury-patients-technique-and-outcomes-over-8-years
#2
Sumanas W Jordan, Mauricio De la Garza, Victor L Lewis
BACKGROUND: Despite newly introduced techniques, reconstruction of ischial pressure ulcers remains a difficult problem with high-reported failure rates. METHODS: A retrospective chart review was performed on all spinal cord injury patients who underwent ischial pressure ulcer reconstruction by the senior author (V.L.) between 2004 and 2012. The two-stage procedure consisted of debridement and bone biopsy, followed by bursectomy, partial ischiectomy, fascial release, and gluteus maximus and hamstring advancement flaps...
January 23, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28268344/the-variability-of-co-activation-pattern-of-antagonist-muscles-in-human-infant-crawling
#3
Qi L Xiong, Xiao Y Wu, Nong Xiao, Si Y Zeng, Xiao L Zheng, Di Wu, Wen S Hou
Infant crawling is part of normal human gross motor development, and a 4-beat gait that involves rhythmical flexion and extension of limbs and the underlying muscle co-activation of antagonist muscle around the joint. However, detection the co-activation pattern of antagonist muscle are sparse due to the general difficulty of measuring locomotion in human infants. In this paper, sEMG of antagonist muscles and the corresponding kinematics data of limbs were collected when infants were crawling on hands and knees at their self-selected speed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28265144/immediate-effects-of-graston-technique-on-hamstring-muscle-extensibility-and-pain-intensity-in-patients-with-nonspecific-low-back-pain
#4
Jong Hoon Moon, Jin-Hwa Jung, Young Sik Won, Hwi-Young Cho
[Purpose] The purpose of this study was to analyze the effect of Graston Technique on hamstring extensibility and pain intensity in patients with nonspecific low back pain. [Subjects and Methods] Twenty-four patients with nonspecific low back pain (27-46 years of age) enrolled in the study. All participants were randomly assigned to one of two groups: Graston technique group (n=12) and a static stretching group (n=12). The Graston Technique was used on the hamstring muscles of the experimental group, while the static stretching group performed static stretching...
February 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28259710/no-beneficial-effect-of-bracing-after-anterior-cruciate-ligament-reconstruction-in-a-cohort-of-969-athletes-followed-in-rehabilitation
#5
P Bordes, E Laboute, A Bertolotti, J F Dalmay, P Puig, P Trouve, E Verhaegue, P A Joseph, P Dehail, M De Seze
OBJECTIVE: Compare the clinical outcomes of different knee braces in the early phase of rehabilitation after anterior cruciate ligament reconstruction (ACLR) in athletes. MATERIALS AND METHODS: We conducted a retrospective database study of athletes during early rehabilitation in a tertiary referral hospital between 1 February 2008 and 30 October 2010 after ACLR using bone patellar tendon bone (BPTB) or hamstring autograft. Differences in mid-patellar knee circumference, pain, and range of motion were assessed at admission...
March 1, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28247444/velocity-specific-and-time-dependent-adaptations-following-a-standardised-nordic-hamstring-exercise-training
#6
Tobias Alt, Yannick T Nodler, Jannik Severin, Axel J Knicker, Heiko K Strüder
The Nordic Hamstring Exercise (NHE) is effective for selective hamstring strengthening to improve muscle balance between knee flexors and extensors. The purpose of this study (within subject design of repeated measures) was to determine the effects of a standardised 4-week NHE training on thigh strength and balance with concomitant kinetic and kinematic monitoring. Sixteen male sprinters (22 years, 181 cm, 76 kg) performed a standardised 4-week NHE training consisting of three sessions per week (each 3 x 3 repetitions)...
March 1, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28247210/age-related-effects-on-maximal-and-rapid-hamstrings-quadriceps-strength-capacities-and-vertical-jump-power-in-young-and-older-females
#7
Ty B Palmer, Brittany N Followay, Brennan J Thompson
BACKGROUND AND AIMS: Declines in hamstrings and quadriceps maximal and rapid strength are commonly reported as a consequence of aging; however, few studies have investigated the influence of age on maximal and rapid hamstrings to quadriceps (H/Q) strength ratios. This study aimed to examine the effects of age on leg extension and flexion maximal and rapid torque production, H/Q strength ratios, and muscle power in healthy, young and old females. METHODS: Fifteen young (21 ± 2 years) and 15 old (69 ± 7 years) females performed 3 isometric leg extension and flexion maximal voluntary contractions (MVCs), from which peak torque (PT), early (0-30 ms) and late (0-200 ms) phase rate of torque development (RTD), and PT and RTD H/Q strength ratios were extracted...
February 28, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28227316/dynamic-knee-muscle-co-contraction-quantified-during-walking
#8
Annachiara Strazza, Alessandro Mengarelli, Valentina Agostini, Marco Knaflitz, Laura Burattini, Sandro Fioretti, Francesco Di Nardo, Annachiara Strazza, Alessandro Mengarelli, Valentina Agostini, Marco Knaflitz, Laura Burattini, Sandro Fioretti, Francesco Di Nardo, Sandro Fioretti, Francesco Di Nardo, Annachiara Strazza, Valentina Agostini, Marco Knaflitz, Laura Burattini, Alessandro Mengarelli
The purpose of the present study was the quantification of the co-activation patterns of the knee extensor and flexor muscles during walking at self-selected speed and cadence. To this aim, the Statistical Gait Analysis, a recent methodology providing a statistical characterization of gait, was performed on surface EMG signals from Vastus Lateralis (VL) and Medial Hamstrings (MH) in 14 healthy young adult subjects. Muscular co-contraction was assessed as the overlapping period between activation intervals of agonist and antagonist muscles...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226505/the-variability-of-co-activation-pattern-of-antagonist-muscles-in-human-infant-crawling
#9
Qi L Xiong, Xiao Y Wu, Nong Xiao, Si Y Zeng, Xiao L Zheng, Di Wu, Wen S Hou, Qi L Xiong, Xiao Y Wu, Nong Xiao, Si Y Zeng, Xiao L Zheng, Di Wu, Wen S Hou, Wen S Hou, Xiao L Zheng, Di Wu, Xiao Y Wu, Qi L Xiong, Nong Xiao, Si Y Zeng
Infant crawling is part of normal human gross motor development, and a 4-beat gait that involves rhythmical flexion and extension of limbs and the underlying muscle co-activation of antagonist muscle around the joint. However, detection the co-activation pattern of antagonist muscle are sparse due to the general difficulty of measuring locomotion in human infants. In this paper, sEMG of antagonist muscles and the corresponding kinematics data of limbs were collected when infants were crawling on hands and knees at their self-selected speed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28217418/maximum-repetition-performance-after-different-antagonist-foam-rolling-volumes-in-the-inter-set-rest-period
#10
Estêvão Rios Monteiro, Jakob Škarabot, Andrew D Vigotsky, Amanda Fernandes Brown, Thiago Matassoli Gomes, Jefferson da Silva Novaes
BACKGROUND: Foam rollers, or other similar devices, are a method for acutely increasing range of motion, but in contrast to static stretching, do not appear to have detrimental effects on neuromuscular performance. PURPOSE: The purpose of this study was to investigate the effects of different volumes (60 and 120 seconds) of foam rolling of the hamstrings during the inter-set rest period on repetition performance of the knee extension exercise. METHODS: Twenty-five recreationally active females were recruited for the study (27...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28217417/biomechanical-differences-in-brazilian-jiu-jitsu-athletes-the-role-of-combat-style
#11
Pedro Olavo de Paula Lima, Alane Almeida Lima, Anita Camila Sampaio Coelho, Yuri Lopes Lima, Gabriel Peixoto Leão Almeida, Márcio Almeida Bezerra, Rodrigo Ribeiro de Oliveira
BACKGROUND: Brazilian Jiu-Jitsu (BJJ) athletes can be divided into two combat styles: pass fighters (PFs) and guard fighters (GFs). Flexibility of the posterior chain muscles is highly necessary in these athletes, especially in GFs. On the other hand, isometric strength of the trunk extensors is required in PFs. Handgrip strength is important in holding the kimono of the opponent, and symmetrical lower-limb strength is important for the prevention of injuries due to the overload caused by training...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28203600/do-muscle-strength-deficits-of-the-uninvolved-hip-and-knee-exist-in-young-athletes-before-anterior-cruciate-ligament-reconstruction
#12
Joseph Hannon, Sharon Wang-Price, Shiho Goto, J Craig Garrison, James M Bothwell
BACKGROUND: Muscle strength of the involved limb is known to be decreased after injury. Comparison with the uninvolved limb has become standard of practice to measure progress and for calculation of limb symmetry indices (LSIs) to determine readiness to return to sport. However, some literature suggests strength changes in the uninvolved limb also are present after lower extremity injury. PURPOSE: To examine the uninvolved limb strength in a population of adolescent athletes after an anterior cruciate ligament (ACL) injury and compare strength values with those of the dominant limb in a healthy control group...
January 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28174444/does-the-q-h-index-show-a-stronger-relationship-than-the-h-q-ratio-in-regard-to-knee-pain-during-daily-activities-in-patients-with-knee-osteoarthritis
#13
Remi Fujita, Yasumoto Matsui, Atsushi Harada, Marie Takemura, Izumi Kondo, Tetsuya Nemoto, Tadahiro Sakai, Hideki Hiraiwa, Susumu Ota
[Purpose] The purpose of this study was to elucidate the relationship between knee muscle strength and knee pain in activities of daily living, based on consideration of the difference between extension and flexion strength (Q - H) and the hamstring:quadriceps (H:Q) ratio in patients with knee osteoarthritis. [Subjects and Methods] The participants were 78 females with knee osteoarthritis, and a total of 133 knees that had not been treated surgically were the targets of this research. The legs were divided according to dominance...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28149407/effects-of-acute-fatigue-of-the-hip-flexor-muscles-on-hamstring-muscle-extensibility
#14
José M Muyor, Francisco M Arrabal-Campos
The purpose of the present study was to evaluate the influence of acute fatigue of the hip flexor muscles on scores attained in tests frequently used in literature to measure hamstring muscle extensibility, namely the passive straight leg raise (PSLR), active straight leg raise (ASLR), passive knee extension (PKE), active knee extension (AKE), sit-and-reach (SR) and toe-touch (TT) tests. A total of seventy-five healthy and recreationally active adults voluntarily participated in this study. To reach fatigue, the participants actively lifted their legs alternately as many times as possible...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28144413/the-isokinetic-and-electromyographic-assessment-of-knee-muscles-strength-in-the-short-and-long-term-type-2-diabetes
#15
Ahmadreza Askary-Ashtiani, Ali Ghanjal, Monireh Motaqi, Gholam Hossein Meftahi, Boshra Hatef, Hoda Niknam
BACKGROUND: Type 2 diabetes (T2DM) patients are subject to muscle weakness. OBJECTIVES: The aim of the study was an assessment of electromyographic (EMG) activity of knee muscles during isometric maximal voluntary contraction in the different disease durations of T2DM. METHODS: Eighteen patients with less than 10 years and twelve patients with more than 10 years of T2DM were compared with nineteen matched healthy control subjects. EMG of flexor and extensor muscles of knee concurrently with isometric maximal peak torque of knee flexion and extension at 75 degrees of knee flexion were recorded in three groups...
December 2016: Asian Journal of Sports Medicine
https://www.readbyqxmd.com/read/28095102/electromyographic-analysis-of-gluteus-maximus-and-hamstring-activity-during-the-supine-resisted-hip-extension-exercise-versus-supine-unilateral-bridge-to-neutral
#16
James W Youdas, James P Hartman, Brooke A Murphy, Ashley M Rundle, Jenna M Ugorowski, John H Hollman
Hip extension strengthening exercises which maximize gluteus maximus contributions and minimize hamstring influences may be beneficial for persons with hip pain. This study's aim was to compare muscle activation of the gluteus maximus and hamstrings from healthy subjects during a supine resisted hip extension exercise versus supine unilateral bridge to neutral. Surface electromyographic (EMG) signals were obtained from the right gluteus maximus and hamstrings in 13 healthy male and 13 healthy female subjects...
February 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/28090180/a-randomised-placebo-controlled-trial-of-neurodynamic-sliders-on-hamstring-responses-in-footballers-with-hamstring-tightness
#17
Pattanasin Areeudomwong, Ketsarakon Oatyimprai, Saranchana Pathumb
BACKGROUND: Neurodynamics intervention is known to increase apparent muscle extensibility, but information regarding hamstring responses after a neurodynamic sliders (NS) technique is scarce. The aim of this study was to evaluate the effects of NS on apparent hamstring extensibility and activity in footballers with hamstring tightness. METHODS: Forty eligible healthy male footballers with hamstring tightness were each randomly allocated to either a 4-week NS technique or a control group (CG) receiving placebo shortwave intervention...
November 2016: Malaysian Journal of Medical Sciences: MJMS
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
#18
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...
January 2017: 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-biomechanical-investigation-regarding-dynamic-stabilization-of-the-medial-compartment-by-the-hamstring-muscles
#19
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...
March 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28028870/neuromuscular-performance-of-maximal-voluntary-explosive-concentric-contractions-is-influenced-by-angular-acceleration
#20
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
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