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Rectus femoris

Massimo Salvi, Cristina Caresio, Kristen M Meiburger, Bruno De Santi, Filippo Molinari, Marco Alessandro Minetto
Ultrasonography allows non-invasive and real time-measurement of the visible cross-sectional area (CSA) of muscles, which is a clinically relevant descriptor of muscle size. The aim of this study was to develop and validate a fully automatic method called transverse muscle ultrasound analysis (TRAMA) for segmentation of the muscle in B-mode transverse ultrasound images and measurement of muscle CSA. TRAMA was tested on a database of 200 ultrasound images of the rectus femoris, vastus lateralis, tibialis anterior and medial gastrocnemius muscles...
January 9, 2019: Ultrasound in Medicine & Biology
Mohammad Hassan Jahanandish, Nicholas P Fey, Kenneth Hoyt
OBJECTIVE: Powered assistive devices need improved control intuitiveness to enhance their clinical adoption. Therefore, the intent of individuals should be identified and the device movement should adhere to it. Skeletal muscles contract synergistically to produce defined lower-limb movements so unique contraction patterns in lower-extremity musculature may provide a means of device joint control. Ultrasound (US) imaging enables direct measurement of the local deformation of muscle segments...
January 9, 2019: IEEE Journal of Biomedical and Health Informatics
Tommy R Lundberg, Maria Teresa García-Gutiérrez, Mirko Mandic, Mats Lilja, Rodrigo Fernandez-Gonzalo
This study compared the effects of the most frequently employed protocols of flywheel vs. weight-stack resistance exercise (RE) on regional and muscle-specific adaptations of the knee extensors. Sixteen men (n=8) and women (n=8) performed 8 weeks (2-3 days/wk) of knee extension RE employing flywheel technology (FW) on one leg (4x7 repetitions), while the contralateral leg performed regular weight-stack (WS) training (4x8-12 repetitions). Maximal strength (1RM in WS) and peak FW power were determined before and after training for both legs...
January 8, 2019: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Guoning Zhang, Jia Li, Zhengliang Xia, Weidong Xu
OBJECTIVE: The aim of the study was to investigate the gait deviations of ankylosing spondylitis (AS) patients with hip involvement. METHODS: Thirty-six subjects, including 18 AS patients with hip involvement (AS group) and 18 healthy people (control subjects, CS group), were enrolled in the study. Three-dimensional gait analysis of the AS group and CS group was performed. Kinematic parameters, kinetic parameters and surface electromyography (sEMG) during the gait cycle were measured...
January 4, 2019: Clinical Rheumatology
Hyeonseok Kim, Jongho Lee, Jaehyo Kim
This study suggested a new EMG-signal-based evaluation method for knee rehabilitation that provides not only fragmentary information like muscle power but also in-depth information like muscle fatigue in the field of rehabilitation which it has not been applied to. In our experiment, nine healthy subjects performed straight leg raise exercises which are widely performed for knee rehabilitation. During the exercises, we recorded the joint angle of the leg and EMG signals from four prime movers of the leg: rectus femoris (RFM), vastus lateralis, vastus medialis, and biceps femoris (BFLH)...
November 2018: Biomedical Engineering Letters
Yeshaswini Katari, Rangalakshmi Srinivasan, Priyadarshini Arvind, Sahajananda Hiremathada
Background: Muscular atrophy is the universal feature in patients with ICUAW. Muscles of the lower limb are more prone to early atrophy. Measurement of fat thickness is used to assess malnutrition. This study was designed to evaluate if, subcutaneous fat also reduces along with muscle thickness and if it can be reliably used as an indicator of nutritional assessment in critically ill patients using point of care ultrasound. Materials and Methods: An observational clinical study of 100 patients admitted to multidisciplinary intensive care units (ICUs)...
November 2018: Indian Journal of Critical Care Medicine
Eiji Fujita, Dennis R Taaffe, Yasuhide Yoshitake, Hiroaki Kanehisa
PURPOSE: To examine the effect of a conditioning program consisting of repeated sit-to-stand exercise on knee extensor strength and muscular activities during body mass-based squat movement in physically frail elders. METHODS: Fourteen men and women aged 75 to 88 years who used the long-term care insurance system participated in the 12-week training program (48 reps/session, 3 sessions/week). Isometric knee extension torque (KET) during a maximum voluntary contraction (MVC) and electromyogram (EMG) activities of the rectus femoris and vastus lateralis muscles during the MVC and a body mass-based squat task were determined at baseline, and following 4 and 12 weeks training...
December 27, 2018: Experimental Gerontology
Timothy T T Yam, Peggy P L Or, Ada W W Ma, Shirley S M Fong, Man Sang Wong
BACKGROUND: Children with developmental coordination disorder (DCD) have leg muscular deficits which negatively affects their dynamic postural stability. Kinesio tape (KT) could enhance muscle activation, postural control and functional activities in healthy individuals. Therefore, we hypothesized that the usage of KT may address the postural instability problem of children with DCD. RESEARCH QUESTION: To investigate the immediate effect of KT on dynamic postural stability and the associated lower limb muscle activity in children with DCD...
December 18, 2018: Gait & Posture
Jakob Škarabot, Paul Ansdell, Callum G Brownstein, Kevin Thomas, Glyn Howatson, Stuart Goodall, Rade Durbaba
Electrical stimulation over the mastoids or thoracic spinous processes has been used to assess subcortical contribution to corticospinal excitability, but responses are difficult to evoke in the resting lower limbs or are limited to only a few muscle groups. This might be mitigated by delivering the stimuli lower on the spinal column, where the descending tracts contain a greater relative density of motoneurons projecting to lower limb muscles. We investigated activation of the corticospinal axons innervating tibialis anterior (TA) and rectus femoris (RF) by applying a single electrical stimulus over the first lumbar spinous process (LS)...
December 27, 2018: European Journal of Neuroscience
Tetsuro Hida, Kei Ando, Kazuyoshi Kobayashi, Kenyu Ito, Mikito Tsushima, Tomonori Kobayakawa, Masayoshi Morozumi, Satoshi Tanaka, Masaaki Machino, Kyotaro Ota, Shunsuke Kanbara, Sadayuki Ito, Naoki Ishiguro, Yukiharu Hasegawa, Shiro Imagama
Our aim of this study is to compare the thigh muscle thickness measurements obtained using ultrasound and bioelectrical impedance analysis (BIA) methods, and to investigate the validity and cutoff value of the ultrasonography. We analyzed a total of 201 participants (99 male and 102 female participants, mean age, 66.2 years) participated in the annual health checkup in the Yakumo Study, 2014. Thigh muscle thickness (TMT, sum of the rectus femoris and vastus intermedius muscle thickness) was measured using ultrasound at mid-thigh in the sitting position...
November 2018: Nagoya Journal of Medical Science
Margus Eimre, Kalju Paju, Nadežda Peet, Lumme Kadaja, Marian Tarrend, Sergo Kasvandik, Joosep Seppet, Marilin Ivask, Ehte Orlova, Sulev Kõks
Wfs1 deficiency leads to a progressive loss of plasma insulin concentration, which should reduce the consumption of glucose in insulin-dependent tissues, causing a variety of changes in intracellular energy metabolism. Our objective here was to assess the changes in the amount and function of mitochondrial proteins in different muscles of Wfs1-deficient mice. Mitochondrial functions were assayed by high-resolution oxygraphy of permeabilized muscle fibers; the protein amount was evaluated by liquid chromatography tandem mass spectrometry (LC/MS/MS) analysis and mRNA levels of the uncoupler proteins UCP2 and UCP3 by real-time PCR; and citrate synthase (CS) activity was determined spectrophotometrically in muscle homogenates...
2018: Oxidative Medicine and Cellular Longevity
Vojko Glaser, Ales Holobar
We describe the method for identification of motor unit (MU) firings from high-density surface electromyograms (hdEMG), recorded during repeated dynamic muscle contractions. New convolutive data model for dynamic hdEMG is presented, along with Pulse-to-Noise Ratio (PNR) metric for assessment of MU identification accuracy and analysis of the impact of MU action potential (MUAP) changes in dynamic muscle contractions on MU identification. We tested the presented methodology on signals from biceps brachii, vastus lateralis and rectus famoris muscles, all during different speeds of dynamic contractions...
December 17, 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Simon Gavanda, Stephan Geisler, Oliver Jan Quittmann, Thorsten Schiffer
PURPOSE: Muscle mass, strength and power are important factors for performance. To improve these characteristics, periodized resistance training is used. However, there is no consensus regarding the most effective periodization model. Therefore the purpose of this study was to compare the effects of block (BLOCK) versus daily undulating periodization (DUP) on body composition, hypertrophy, strength, performance and power in adolescent American football players. METHODS: Forty-seven subjects participated in this study (M±SD age = 17±0...
December 20, 2018: International Journal of Sports Physiology and Performance
Manisha Pratihast, Ahmed Al-Ani, Rifai Chai, Steven Su, Ganesh Naik
The goal of this research was to investigate the effect of wearing high-heeled shoes (HHS) on lower limb muscle synchronisation during walking, using beta band (15-30 Hz) coherence analysis. Fifteen females with no previous neuromuscular disorders volunteered in this study. Surface electromyography in frequency domain was studied from rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM) and semitendinosus (ST) muscles during walking by subjects wearing HHS of three different heel heights (low - 4 cm, medium - 6 cm and high - 10 cm)...
December 2018: Healthcare Technology Letters
Arun Jayaraman, Megan K O'Brien, Sangeetha Madhavan, Chaithanya K Mummidisetty, Heidi R Roth, Kristen Hohl, Annie Tapp, Kimberly Brennan, Masha Kocherginsky, Kenton J Williams, Hideaki Takahashi, William Z Rymer
OBJECTIVE: To test the hypothesis that gait training with a hip-assistive robotic exoskeleton improves clinical outcomes and strengthens the descending corticospinal drive to the lower limb muscles in persons with chronic stroke. METHODS: Fifty participants completed the randomized, single-blind, parallel study. Participants received over-ground gait training with the Honda Stride Management Assist (SMA) exoskeleton or intensity-matched functional gait training, delivered in 18 sessions over 6-8 weeks...
December 19, 2018: Neurology
R Rehmann, L Schlaffke, M Froeling, R A Kley, E Kühnle, M De Marées, J Forsting, M Rohm, M Tegenthoff, T Schmidt-Wilcke, M Vorgerd
PURPOSE: To evaluate differences in diffusion parameters in thigh muscles in patients with glycogen storage disease type V (McArdle disease) using muscle diffusion tensor imaging (mDTI) compared to healthy controls METHODS: In this prospective study, we evaluated thigh muscles from hip to knee of 10 McArdle patients (5 female, mean age 33.7 ± 14.4 years) and 10 healthy age- and gender-matched volunteers. MRI scans were performed at 3 T and comprised mDTI, T1-weighted and T2-weighted imaging between May 2015 and May 2017...
December 17, 2018: European Radiology
Akira Saito, Masahiko Wakasa, Minoru Kimoto, Takashi Ishikawa, Megumi Tsugaruya, Yu Kume, Kyoji Okada
AIM: To clarify the age-related changes in muscle elasticity or thickness of the lower extremities in older women, and to analyze their relationship with physical functions. METHODS: The muscle elasticity and thickness of the rectus femoris and medial head of the gastrocnemius of 102 young women (young group) and 221 elderly women (elderly group) were measured using ultrasonography. In the elderly group, physical functions, including knee extension strength, Timed Up and Go test, single-leg standing, maximum gait speed and Four Square Step Test were also measured...
December 16, 2018: Geriatrics & Gerontology International
Pascal Edouard, Jurdan Mendiguchia, Johan Lahti, Pierrick J Arnal, Philippe Gimenez, Pedro Jiménez-Reyes, Matt Brughelli, Pierre Samozino, Jean-Benoit Morin
Aim: Hamstring muscle injury is the main injury related to sports requiring sprint acceleration. In addition, hamstring muscles have been reported to play a role in horizontal force production during sprint acceleration performance. The aim of the present study was to analyze (i) the determinants of horizontal force production and (ii) the role of hip extensors, and hamstring muscles in particular, for horizontal force production during repeated sprint-induced fatigue conditions. Method: In this experimental laboratory setting study including 14 sprint-trained male athletes, we analyzed (i) the changes in sprint mechanics, peak torque of the knee and hip extensors and flexors, muscle activity of the vastus lateralis , rectus femoris , biceps femoris , and gluteus , and sagittal plane lower limb motion, before and after twelve 6-s sprints separated by 44 s rest on an instrumented motorized treadmill, and (ii) the determinants of horizontal force production ( FH ) during the sprint acceleration in a fatigue state (after 12 sprints)...
2018: Frontiers in Physiology
Kohei Watanabe
INTRODUCTION: The present study investigated the effect of stretchable characteristics of elastic therapeutic tape and its elongation on surface electromyography (EMG) of knee extensor muscles during knee extension movements. METHODS: Nine healthy men performed knee extension movement with the application of normal elastic tape or highly stretchable tape and without the tapes (control). Tapes were applied on the anterior thigh to cross the knee joint with no elongation and elongation of 50 and 75% of the maximum stretchability...
December 12, 2018: Human Movement Science
Tien Tuan Dao
Skeletal muscle forces may be estimated using rigid musculoskeletal models and neural networks. Neural network (NN) approach has the advantages of real-time estimation ability and promising prediction accuracy. However, most of the developed NN models are based on conventional feedforward NNs, which do not take dynamic temporal relationships of the muscle force profiles into consideration. The objectives of this present paper are twofold: (1) to develop a recurrent deep neural network (RDNN) incorporating dynamic temporal relationships to estimate skeletal muscle forces from kinematics data during a gait cycle; (2) then to establish a transfer learning strategy to improve the accuracy of muscle force estimation...
December 14, 2018: Medical & Biological Engineering & Computing
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