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https://www.readbyqxmd.com/read/28718344/knee-extensor-fatigue-developed-during-high-intensity-exercise-limits-lower-limb-power-production
#1
Steven J O'bryan, François Billaut, Janet L Taylor, David M Rouffet
We investigated the association between changes in vastii electromyography (EMG) and knee extensor fatigue during high-intensity cycling, and the subsequent effect on lower-limb power and intermuscular coordination during all-out cycling. On two separate days, participants completed 30-s all-out cycling or 10-min of high-intensity cycling followed by 30-s all-out cycling. EMG for gluteus maximus (GMAX), rectus femoris (RF), vastii (VAS), hamstrings (HAM) and gastrocnemius (GAS); co-activation for GMAX/RF, VAS/HAM and VAS/GAS; isometric maximal voluntary force (IMVF) and resting twitch (RT) of the knee extensors were measured...
July 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28715424/atrophy-of-gluteus-maximus-among-women-with-a-history-of-chronic-low-back-pain
#2
Amy H Amabile, John H Bolte, Saskia D Richter
BACKGROUND: Although the relationship between low back pain (LBP) and the size of certain trunk muscles has been extensively studied, the relationship between gluteus maximus (GM) size and LBP has been only minimally examined. Determining whether such a relationship exists would help improve our understanding of the etiology of LBP, and possibly provide a rationale for the use of therapeutic exercise interventions targeting GM with LBP patients. The objective of this study was to compare gluteus maximus cross-sectional area in individuals with chronic LBP, and in a group of individuals without LBP...
2017: PloS One
https://www.readbyqxmd.com/read/28714838/lower-extremity-muscle-activity-kinematics-and-dynamic-postural-control-in-individuals-with-patellofemoral-pain
#3
Shiho Goto, Naoko Aminaka, Phillip A Gribble
CONTEXT: Altered lower extremity muscle activity has been suggested to be associated with lower extremity kinematics in individuals with patellofemoral pain (PFP). However, few studies examined these relationships and the results are inconsistent. OBJECTIVES: To compare the lower extremity muscle activity, kinematics, pain level, and reach distance during the anterior reach of the Star Excursion Balance Test (SEBT) between participants with PFP and healthy individuals (CON)...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28714757/comparative-effects-of-four-single-leg-squat-exercises-in-subjects-with-gluteus-medius-weakness
#4
Hae-Rim Han, Chung-Hwi Yi, Sung-Hyun You, Heon-Seock Cynn, One-Bin Lim, Jae-Ik Son
CONTEXT: Of the weight bearing exercises, single leg squat (SLS) represents one of the most commonly used hip strengthening exercises that require more gluteus medius (GMED) activity. To date, no studies have investigated how the four SLS exercises affects muscle imbalance of GMED, tensor fasciae latae (TFL), and adductor longus (AL), and kinematics of hip. OBJECTIVE: To investigate the hip muscle activities, onset time, and kinematics during four different SLS exercises (unilateral squat, unilateral wall-squat, lateral step-down, and front step-down) in subjects with GMED weakness...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28707952/systemic-delivery-of-dysferlin-overlap-vectors-provides-long-term-functional-improvement-for-dysferlinopathy
#5
Rachael A Potter, Danielle A Griffin, Patricia C Sondergaard, Ryan W Johnson, Eric R Pozsgai, Kristin N Heller, Ellyn L Peterson, Kimmo K Lehtimaki, Hillarie P Windish, Plavi J Mittal, Doug E Albrecht, Jerry R Mendell, Louise R Rodino-Klapac
Dysferlinopathies comprise a family of disorders caused by mutations in the dysferlin (DYSF) gene leading to a progressive dystrophy characterized by chronic muscle fiber loss, fat replacement and fibrosis. To correct the underlying histopathology and function, expression of full-length DYSF is required. We have developed dual adeno-associated virus vectors defined by a region of homology to serve as a substrate for reconstitution of the full 6.5 kb dysferlin cDNA. Our previous work studied the efficacy of this treatment through intramuscular and regional delivery routes...
July 14, 2017: Human Gene Therapy
https://www.readbyqxmd.com/read/28697197/increased-and-normalized-uptake-of-18-f-fdg-in-a-case-of-bone-periprosthetic-infection-treated-by-antibiotics
#6
Valentina Lavelli, Cristina Ferrari, Artor Niccoli Asabella, Corinna Altini, Francesco Saverio Vella, Giuseppe Rubini
We report the case of a 69 years old man with left hip prosthesis, who presented clinical, biochemical and imaging signs of periprosthetic infection treated with linezolid, an antibacterial agent of the oxazolidinone class. Two weeks after this treatment, a fluorine-18-fluoro-2-deoxy-d-glucose positron emission tomography/computed tomography ((18)F-FDG PET/CT) scan showed increased uptake in the skeleton and also increased uptake in several focal areas in the spine and near the prosthesis and the surgical wound on the left gluteus medius...
July 12, 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28694073/gluteus-maximus-hypertrophy-a-diagnostic-clue-in-four-and-a-half-lim-domain-1-mutated-reducing-body-myopathy
#7
Manu Jokela, Sanna Huovinen, Johanna Palmio, Anna-Maija Saukkonen, Sini Penttilä, Bjarne Udd
No abstract text is available yet for this article.
June 23, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28691582/the-next-step-in-understanding-impaired-reactive-balance-control-in-people-with-stroke-the-role-of-defective-early-automatic-postural-responses
#8
Digna de Kam, Jolanda M B Roelofs, Amber K B D Bruijnes, Alexander C H Geurts, Vivian Weerdesteyn
BACKGROUND AND OBJECTIVE: Postural muscle responses are often impaired after stroke. We aimed to identify the contribution of deficits in very early postural responses to poorer reactive balance capacity, with a particular focus on reactive stepping as a key strategy for avoiding falls. METHODS: A total of 34 chronic stroke survivors and 17 controls were subjected to translational balance perturbations in 4 directions. We identified the highest perturbation intensity that could be recovered without stepping (single stepping threshold [SST]) and with maximally 1 step (multiple stepping threshold [MST])...
July 1, 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/28675778/hip-abductor-muscle-activity-during-walking-in-individuals-with-gluteal-tendinopathy
#9
Kim Allison, Sauro E Salomoni, Kim L Bennell, Tim V Wrigley, Francois Hug, Bill Vicenzino, Alison Grimaldi, Paul W Hodges
The external hip adduction moment during walking is greater in individuals with gluteal tendinopathy (GT) than pain-free controls. Although this likely represents a greater demand on the hip abductor muscles implicated in GT, no study has investigated activation of these muscles in GT. For this purpose, fine wire electrodes were inserted into the segments of the gluteus minimus and medius muscles, and surface electrodes placed on the tensor fascia lata, upper gluteus maximus and vastus lateralis muscles of thirteen individuals with, and thirteen without, GT...
July 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28653780/gait-training-for-chronic-ankle-instability-improves-neuromechanics-during-walking
#10
Mark A Feger, Joseph M Hart, Susan Saliba, Mark F Abel, Jay Hertel
A novel gait-training device has been shown to improve gait patterns while patients with chronic ankle instability (CAI) are using the device and our current objective was to analyze the effect of structured gait training with the device on plantar pressure and surface electromyography (sEMG) following repeated gait training sessions. Sixteen CAI patients participated. Plantar pressure and sEMG were collected simultaneously during walking pre- and post-gait training. Plantar pressure (pressure time integral, peak pressure, time to peak pressure, contact area, contact time and center of pressure trajectory) of the entire foot and 9 specific regions of the foot were recorded concurrently with sEMG root mean square amplitudes from the anterior tibialis, peroneus longus, medial gastrocnemius, and gluteus medius...
June 27, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28653302/fetal-development-of-the-human-gluteus-maximus-muscle-with-special-reference-to-its-fascial-insertion
#11
Yasuhiro Shiraishi, Zhe Wu Jin, Keisuke Mitomo, Masahito Yamamoto, Gen Murakami, Hiroshi Abe, Jőrg Wilting, Shin-Ichi Abe
The human gluteus maximus muscle (GMX) is characterized by its insertion to the iliotibial tract (a lateral thick fascia of the thigh beneath the fascia lata), which plays a critical role in lateral stabilization of the hip joint during walking. In contrast, in non-human primates, the GMX and biceps femoris muscle provide a flexor complex. According to our observations of 15 human embryos and 11 fetuses at 7-10 weeks of gestation (21-55 mm), the GMX anlage was divided into 1) a superior part that developed earlier and 2) a small inferior part that developed later...
June 27, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/28652809/anatomical-study-of-middle-cluneal-nerve-entrapment
#12
Tomoyuki Konno, Yoichi Aota, Tomoyuki Saito, Ning Qu, Shogo Hayashi, Shinichi Kawata, Masahiro Itoh
OBJECT: Entrapment of the middle cluneal nerve (MCN) under the long posterior sacroiliac ligament (LPSL) is a possible, and underdiagnosed, cause of low-back and/or leg symptoms. To date, detailed anatomical studies of MCN entrapment are few. The purpose of this study was to ascertain, using cadavers, the relationship between the MCN and LPSL and to investigate MCN entrapment. METHODS: A total of 30 hemipelves from 20 cadaveric donors (15 female, 5 male) designated for education or research, were studied by gross anatomical dissection...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28649047/high-pressure-processing-improves-the-tenderness-and-quality-of-hot-boned-beef
#13
James D Morton, R Grant Pearson, Hannah Y-Y Lee, Stephanie Smithson, Susan L Mason, Roy Bickerstaffe
Strip loins from different grades of cattle were subjected to two levels of high pressure processing (HPP) within 1h of slaughter at a commercial meat processing plant and chilled for 1day before freezing. The physical and eating quality characteristics of longissimus thoracis (strip loin) steaks from HPP were compared to meat that was chill aged for 1 or 28days. HPP produced meat after 1day with 60% lower shear force and higher sensory eating quality scores than 1day chill aged meat. Extended chill storage for 28days produced steaks of similar tenderness to HPP meat...
June 16, 2017: Meat Science
https://www.readbyqxmd.com/read/28640896/beneficial-effects-of-a-gait-used-while-wearing-a-kimono-to-decrease-the-knee-adduction-moment-in-healthy-adults
#14
Susumu Ota, Yukari Ogawa, Hiroki Ota, Tomoya Fujiwara, Tadashi Sugiyama, Akira Ochi
The knee adduction moment (KAM) relates to medial knee osteoarthritis (OA). Several gait modifications to reduce the KAM for the prevention of knee OA have been studied. Most of the modifications, however, involve voluntary changes in leg alignment. Here we investigated the biomechanical effects for reducing the KAM of a walking style with a small trunk rotation and arm swing gait, which is a natural walking style used while wearing a kimono (Nanba walk) that shifts the ground reaction force toward the stance leg (reduced lever arm)...
2017: PloS One
https://www.readbyqxmd.com/read/28633587/sarcomatoid-carcinoma-manifesting-as-recurrent-rectal-cancer-and-mimicking-radiation-induced-extraskeletal-osteosarcoma-a-case-report
#15
MiJo Lee, Hyun-Jin Son, Je-Ho Jang, Hyun-Young Han, Moon Hyang Park
Here, we report an unusual case of sarcomatoid carcinoma mimicking extraskeletal osteosarcoma that manifested as recurrent rectal cancer. Five years earlier, a 76-year-old male patient had undergone neoadjuvant chemoradiotherapy followed by a laparoscopic low anterior resection due to adenocarcinoma of the rectum. He was admitted because of pain in the anus and left hip. He underwent abdominal computed tomography that revealed a newly developed left perirectal mass with gluteus maximus invasion measuring up to 8 cm, and therefore, an abdominoperineal resection was performed...
June 1, 2017: International Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28632052/motor-unit-firing-frequency-of-lower-limb-muscles-during-an-incremental-slide-board-skating-test
#16
Tatiane Piucco, Rodrigo Bini, Masanori Sakaguchi, Fernando Diefenthaeler, Darren Stefanyshyn
This study investigated how the combination of workload and fatigue affected the frequency components of muscle activation and possible recruitment priority of motor units during skating to exhaustion. Ten male competitive speed skaters performed an incremental maximal test on a slide board. Activation of six muscles from the right leg was recorded throughout the test. A time-frequency analysis was performed to compute overall, high, and low frequency bands from the whole signal at 10, 40, 70, and 90% of total test time...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28624266/-trochanteric-under-gluteus-lift-or-bodylift-technique-for-massive-trochanteric-lipodystrophy-about-11-cases
#17
L Ruffenach, C Bruant-Rodier, E Robert, F Bodin, C Dissaux
INTRODUCTION: There is a growing demand for weight loss sequelae. Some women have a particular morphology with a major trochanteric excess that warrants specific treatment. MATERIALS AND METHODS: On the basis of the technique published in 1964 by Pitanguy, the authors suggest a lift of the external face of the thigh with the scar redrawing the lower part of the buttock, from the gluteal fold to the inguinal region by crossing the trochanteric region. Eleven cases of major trochanteric excess after slimming are presented...
June 14, 2017: Annales de Chirurgie Plastique et Esthétique
https://www.readbyqxmd.com/read/28606466/hip-rate-of-force-development-and-strength-are-impaired-in-females-with-patellofemoral-pain-without-signs-of-altered-gluteus-medius-and-maximus-morphology
#18
Guilherme S Nunes, Christian John Barton, Fábio Viadanna Serrão
OBJECTIVES: To compare rate of force development (RFD) and isometric muscle strength of the hip abductors and extensors; and the thickness and the amount of non-contractile tissue of the gluteus medius and maximus between females with and without patellofemoral pain (PFP). DESIGN: Cross-sectional study. METHODS: Fifty-four physically active females (27 with PFP and 27 healthy individuals) were studied. Hip muscle isometric strength and RFD was evaluated using isokinetic dynamometry...
May 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28605265/associations-between-individual-lower-limb-muscle-volumes-and-100-m-sprint-time-in-male-sprinters
#19
Norihide Sugisaki, Kai Kobayashi, Hiroyasu Tsuchie, Hiroaki Kanehisa
PURPOSE: To elucidate the relationship between the muscularity of individual lower limb muscles and 100-m race time (t100) in young adult male sprinters. METHODS: A total of 31 young adult male sprinters took part in this study (age, 19.9 ± 1.4 years; height, 173.5 ± 4.6 cm; body mass, 67.0 ± 4.9 kg; t100, 10.23-11.71 s). The cross-sectional images from the origin to insertion of 12 lower limb muscles were obtained with a magnetic resonance imaging (MRI) system...
June 12, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28605003/outcomes-of-gluteus-maximus-and-tensor-fascia-lata-transfer-for-primary-deficiency-of-the-abductors-of-the-hip
#20
Sivashankar Chandrasekaran, Nader Darwish, S Pavan Vemula, Parth Lodhia, Carlos Suarez-Ahedo, Benjamin G Domb
PURPOSE: This study aims to present 3 patients' results after undergoing gluteus maximus and tensor fascia lata (TFL) transfer for chronic abductor tears unable to be repaired primarily. METHODS: 3 patients were identified intraoperatively as having an abductor tear unable to be repaired primarily. The anterior 1/3 of the gluteus maximus and the posterior 1/3 of the TFL were mobilised and transferred to the greater trochanter in order to reproduce the normal force vector of the gluteus medius and minimus...
June 6, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
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