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https://www.readbyqxmd.com/read/28432901/neuromuscular-rate-of-force-development-deficit-in-parkinson-disease
#1
Kelley G Hammond, Ronald F Pfeiffer, Mark S LeDoux, Brian K Schilling
BACKGROUND: Bradykinesia and reduced neuromuscular force exist in Parkinson disease. The interpolated twitch technique has been used to evaluate central versus peripheral manifestations of neuromuscular strength in healthy, aging, and athletic populations, as well as moderate to advanced Parkinson disease, but this method has not been used in mild Parkinson disease. This study aimed to evaluate quadriceps femoris rate of force development and quantify potential central and peripheral activation deficits in individuals with Parkinson disease...
April 11, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28432421/the-effect-of-nitric-oxide-synthase-inhibition-with-and-without-inhibition-of-prostaglandins-on-blood-flow-in-different-human-skeletal-muscles
#2
Ilkka Heinonen, Bengt Saltin, Ylva Hellsten, Kari K Kalliokoski
PURPOSE: Animal studies suggest that the inhibition of nitric oxide synthase (NOS) affects blood flow differently in different skeletal muscles according to their muscle fibre type composition (oxidative vs glycolytic). Quadriceps femoris (QF) muscle consists of four different muscle parts: vastus intermedius (VI), rectus femoris (RF), vastus medialis (VM), and vastus lateralis (VL) of which VI is located deep within the muscle group and is generally regarded to consist mostly of oxidative muscle fibres...
April 21, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28427422/differences-in-muscle-activity-and-temporal-step-parameters-between-lokomat-guided-walking-and-treadmill-walking-in-post-stroke-hemiparetic-patients-and-healthy-walkers
#3
Klaske van Kammen, Anne M Boonstra, Lucas H V van der Woude, Heleen A Reinders-Messelink, Rob den Otter
BACKGROUND: The Lokomat is a robotic exoskeleton that can be used to train gait function in hemiparetic stroke. To purposefully employ the Lokomat for training, it is important to understand (1) how Lokomat guided walking affects muscle activity following stroke and how these effects differ between patients and healthy walkers, (2) how abnormalities in the muscle activity of patients are modulated through Lokomat guided gait, and (3) how temporal step characteristics of patients were modulated during Lokomat guided walking...
April 20, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28427290/a-real-time-method-for-decoding-the-neural-drive-to-muscles-using-single-channel-intra-muscular-emg-recordings
#4
Saeed Karimimehr, Hamid Reza Marateb, Silvia Muceli, Marjan Mansourian, Miguel Angel Mañanas, Dario Farina
The neural command from motor neurons to muscles - sometimes referred to as the neural drive to muscle - can be identified by decomposition of electromyographic (EMG) signals. This approach can be used for inferring the voluntary commands in neural interfaces in patients with limb amputations. This paper proposes for the first time an innovative method for fully automatic and real-time intramuscular EMG (iEMG) decomposition. The method is based on online single-pass density-based clustering and adaptive classification of bivariate features, using the concept of potential measure...
March 20, 2017: International Journal of Neural Systems
https://www.readbyqxmd.com/read/28426509/log-transformed-emg-amplitude-power-output-relationship-single-leg-knee-extensor-versus-single-leg-cycle-ergometry
#5
Eric B Noble, Joshua M Pilarski, Harshal K Vora, Jorge M Zuniga, Moh H Malek
Comparing and contrasting motor unit recruitment and activation for the same muscles for multiple versus single-joint exercise may provide a better understanding of neuromuscular fatigue. The purpose of this study, therefore, is to compare the slope and y-intercept terms for the three superficial quadriceps femoris (vastus lateralis, rectus femoris, and vastus medialis) muscles derived from the log-transformed EMG amplitude-power output relationship between the single-leg knee-extensor ergometry and the single-leg cycle ergometry...
April 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28423987/reproducibility-of-upper-leg-emg-frequency-content-during-cycling
#6
Rodrigo Rico Bini, Camila Peter Hoefelmann, Vitor Pereira Costa, Fernando Diefenthaeler
Reproducibility of frequency content from surface electromyography (sEMG) signals has not been assessed and it is unknown if incremental load testing design could affect sEMG in cycling. The goals of this study were to assess the reproducibility of measures from sEMG frequency content between sessions and to compare these frequency components between a ramp and a step incremental cycling test. Eighteen cyclists performed four incremental load cycling tests to exhaustion. Two tests were performed using a step increment (load started at 100 W for 3 min followed by increments of 30 W every 3 min) and two were performed using a ramp increment (load started at 100 W for 1 min followed by increments of 30 W·min(-1))...
April 20, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28422559/the-influence-of-ambulatory-aid-on-lower-extremity-muscle-activation-during-gait
#7
Michael Sanders, Anton E Bowden, Spencer Baker, Ryan Jensen, McKenzie Nichols
CONTEXT: Foot and ankle injuries are common, and often require a non-weight bearing period of immobilization for the involved leg. This non-weight bearing period usually results in muscle atrophy for the involved leg. There is a dearth of objective data describing muscle activation for different ambulatory aids that are used during the aforementioned non-weight bearing period. OBJECTIVE: To compare activation amplitudes for four leg muscles during (1) able-bodied gait and (2) ambulation involving three different ambulatory aids that can be used during the acute phase of foot and ankle injury care...
April 19, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28416354/unilateral-jumps-in-different-directions-a-novel-assessment-of-soccer-associated-power
#8
Conall F Murtagh, Jos Vanrenterghem, Andrew O'Boyle, Ryland Morgans, Barry Drust, Robert M Erskine
OBJECTIVES: We aimed to determine whether countermovement jumps (CMJs; unilateral and bilateral) performed in different directions assessed independent lower-limb power qualities, and if unilateral CMJs would better differentiate between elite and non-elite soccer players than the bilateral vertical (BV) CMJ. DESIGN: Elite (n=23; age, 18.1±1.0years) and non-elite (n=20; age, 22.3±2.7years) soccer players performed three BV, unilateral vertical (UV), unilateral horizontal-forward (UH) and unilateral medial (UM) CMJs...
March 29, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28411486/the-effect-of-age-and-knee-osteoarthritis-on-muscle-activation-patterns-and-knee-joint-biomechanics-during-dual-belt-treadmill-gait
#9
Derek Rutherford, Matthew Baker, Ivan Wong, William Stanish
PURPOSE: To compare a group of individuals with moderate medial compartment knee osteoarthritis (OA) to both an age-matched asymptomatic group of older adults and younger adults to determine whether differences in knee joint muscle activation patterns and joint biomechanics exist during gait between these three groups. SCOPE: 20 young adults, 20 older adults, and 40 individuals with moderate knee OA were recruited. Using standardized procedures, surface electromyograms were recorded from the vastus lateralis and medialis, rectus femoris and the medial and lateral hamstrings...
April 7, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28402999/clinical-application-and-the-free-posterior-thigh-perforator-flap
#10
Xiucun Li, Jianli Cui, Suraj Maharjan, Ziping Jiang, Laijin Lu, Xu Gong
OBJECTIVE: The posterior thigh region has been neglected as a donor site for free perforator flaps, likely due to difficulties in positioning the patient during surgery. This study describes the clinical application of the posterior thigh perforator flap based on the third perforating artery of the profunda femoris artery (PFA). METHODS: The free posterior thigh perforator flap based on the third perforating artery of the PFA was used for reconstruction of soft tissue defects in nine patients between February 2010 and May 2014...
May 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28401279/current-concepts-in-the-diagnosis-and-management-of-extra-articular-hip-impingement-syndromes
#11
REVIEW
Naoki Nakano, Grace Yip, Vikas Khanduja
PURPOSE: Extra-articular hip impingement syndromes encompass a group of conditions that have previously been an unrecognised source of pain in the hip and on occasion been associated with intra-articular hip impingement as well. As arthroscopic techniques for the hip continue to evolve, the importance of these conditions has been recognised recently and now form an important part of the differential of an individual presenting with hip pain. The aim of this article, therefore, is to provide the reader with an evidence-based and comprehensive update of these syndromes...
April 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28400676/erratum-core-decompression-or-quadratus-femoris-muscle-pedicle-bone-grafting-for-nontraumatic-osteonecrosis-of-the-femoral-head-a-randomized-control-study
#12
(no author information available yet)
[This corrects the article on p. 629 in vol. 50, PMID: 27904218.].
March 2017: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/28395965/muscular-echovariation-a-new-biomarker-in-amyotrophic-lateral-sclerosis
#13
Jacinto J Martínez-Payá, María Elena Del Baño-Aledo, José Ríos-Díaz, José I Tembl-Ferrairó, Juan F Vázquez-Costa, Francesc Medina-Mirapeix
The purpose of the work described here was to assess the characteristics of echovariation in amyotrophic lateral sclerosis (ALS) compared with other muscle ultrasonography parameters. Twenty-six ALS patients (8 women, mean age 58.9 y, standard deviation 12.02 y) and 26 healthy controls (17 women, mean age 59.6 y, standard deviation 6.41 y) were included in this observational study. They underwent bilateral and transverse ultrasound of the biceps/brachialis, forearm flexor group, quadriceps femoris and tibialis anterior...
April 7, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28394829/electromyographical-comparison-of-muscle-activation-patterns-across-three-commonly-performed-kettlebell-exercises
#14
Brian C Lyons, Jerry J Mayo, W Steve Tucker, Ben Wax, Russell C Hendrix
The purpose of this study was to compare the muscle activation patterns of three different kettlebell (KB) exercises using electromyography (EMG). Fourteen resistance-trained subjects completed a one-arm swing (Swing), one-arm swing style snatch (Snatch), and a one-arm clean (Clean) using a self-selected 8-10 RM load for each exercise. Trial sessions consisted of subjects performing 5 repetitions of each kettlebell exercise. Mean EMG was used to assess the muscle activation of the biceps brachii (BB), anterior deltoid (AD), posterior deltoid (PD), erector spinae (ES), vastus lateralis (VL), biceps femoris (BF), contralateral external oblique (EO), and gluteus maximus (GM) during each lift using surface electrodes...
December 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28392959/restricted-blood-flow-exercise-in-sedentary-overweight-african-american-females-may-increase-muscle-strength-and-decrease-endothelial-function-and-vascular-autoregulation
#15
Vernon Bond, Bryan Heath Curry, Krishna Kumar, Sudhakar Pemminati, Vasavi Rakesh Gorantla, Kishan Kadur, Richard Mark Millis
OBJECTIVES: Exercise with partially restricted blood flow is a low-load, low-intensity resistance training regimen which may have the potential to increase muscle strength in the obese, elderly and frail who are unable to do high-load training. Restricted blood flow exercise has also been shown to affect blood vessel function variably and can, therefore, contribute to blood vessel dysfunction. This pilot study tests the hypothesis that unilateral resistance training of the leg extensors with partially restricted blood flow increases muscle strength and decreases vascular autoregulation...
March 2017: Journal of Pharmacopuncture
https://www.readbyqxmd.com/read/28390140/quantitative-sonographic-assessment-of-the-quadriceps-femoris-muscle-in-healthy-japanese-adults
#16
Tsuneo Watanabe, Hiroki Murakami, Daisuke Fukuoka, Nobuo Terabayashi, Sohee Shin, Tamotsu Yabumoto, Hiroyasu Ito, Hiroshi Fujita, Toshio Matsuoka, Mitsuru Seishima
OBJECTIVES: The aim of this study was to evaluate the relationships among aging, muscle strength, and image feature analysis of the quadriceps femoris muscle and to evaluate the relationship between aging, muscle strength, and sonographic findings. METHODS: One hundred forty-five healthy volunteers participated in the study. The participants were classified into 6 groups on the basis of sex and age. To assess muscle quality, texture analysis was defined with the following parameters: mean, skewness, kurtosis, inverse difference moment, sum of entropy, and angular second moment...
April 8, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28388581/temozolomide-combined-with-irinotecan-caused-regression-in-an-adult-pleomorphic-rhabdomyosarcoma-patient-derived-orthotopic-xenograft-pdox-nude-mouse-model
#17
Kentaro Igarashi, Kei Kawaguchi, Tasuku Kiyuna, Takashi Murakami, Shinji Miwa, Scott D Nelson, Sarah M Dry, Yunfeng Li, Arun S Singh, Hiroaki Kimura, Katsuhiro Hayashi, Norio Yamamoto, Hiroyuki Tsuchiya, Fritz C Eilber, Robert M Hoffman
Adult pleomorphic rhabdomyosarcoma (RMS) is a rare and recalcitrant, highly-malignant mesenchymal tumor in need of improved therapeutic strategies. Our laboratory pioneered the patient-derived orthotopic xenograft (PDOX) nude mouse model with the technique of surgical orthotopic implantation (SOI). We previously described the development of a PDOX model of adult pleomorphic RMS where the tumor behaved similar to the patient donor. A high-grade pleomorphic rhabdomyosarcoma from a striated muscle was previously grown orthotopically in the right biceps-femoris muscle of nude mice to establish the PDOX model...
March 24, 2017: Oncotarget
https://www.readbyqxmd.com/read/28386479/bedside-ultrasound-measurement-of-rectus-femoris-a-tutorial-for-the-nutrition-support-clinician
#18
Carlos Alfredo Galindo Martín, Enrique Monares Zepeda, Octavio Augusto Lescas Méndez
Intensive care unit acquired weakness is a long-term consequence after critical illness; it has been related to muscle atrophy and can be considered as one of the main nutritional support challenges at the intensive care unit. Measuring muscle mass by image techniques has become a new area of research for the nutritional support field, extending our knowledge about muscle wasting and the impact of nutritional approaches in the critical care setting, although currently there is no universally accepted technique to perform muscle measurements by ultrasound...
2017: Journal of Nutrition and Metabolism
https://www.readbyqxmd.com/read/28385562/shoe-cushioning-reduces-impact-and-muscle-activation-during-landings-from-unexpected-but-not-self-initiated-drops
#19
Weijie Fu, Ying Fang, Yaodong Gu, Lingyan Huang, Li Li, Yu Liu
OBJECTIVES: To date, few rigorous scientific studies have been conducted to understand the impact mechanics and muscle activation characteristics of different landing tasks and the influence of shoe properties. The aim of this study was to examine the effects of shoe cushioning on impact biomechanics and muscular responses during drop landings. DESIGN: A single-blinded and randomized design. METHODS: Twelve male collegiate basketball players performed bipedal landings from self-initiated and unexpected drops (SIDL and UDL) from a 60-cm height wearing highly-cushioned basketball shoes (Bball) and less cushioned control shoes (CC)...
March 21, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28378501/acl-reconstruction-does-not-induce-further-gamma-loop-abnormalities-on-the-intact-side-of-the-qf-a-longitudinal-study
#20
Yu Konishi
This study aimed to investigate the effect of surgery on the gamma-loop of the quadriceps on the side with an intact knee in patients with ACL injuries. We compared longitudinally the response of alpha motor neurons to vibration stimulation of the quadriceps on the side with an intact knee before and after ACL reconstruction. To evaluate alpha motor neuron response, we measured the maximal knee extension strength and integrated electromyography of the vastus medialis, vastus lateralis, and rectus femoris. After obtaining pre-vibration data from each subject, vibration stimulation was applied to the infrapatellar tendon, and the same measurements were performed immediately after stimulation...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
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