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Rectus femoris

Kate Hayes, Anne E Holland, Vincent A Pellegrino, Sunita Mathur, Carol L Hodgson
PURPOSE: Muscle weakness is common in patients requiring extracorporeal membrane oxygenation (ECMO), but early identification is challenging. This study aimed to 1) quantify the change in quadriceps size and quality (echogenicity) from baseline to day 10 using ultrasound in patients requiring ECMO, 2) determine the relationship between ultrasound measures, muscle strength and highest mobility level. MATERIALS AND METHODS: Prospective cohort study involving ultrasound measurement of quadriceps at baseline, days 10 and 20...
August 7, 2018: Journal of Critical Care
Jeroen Aeles, Ilse Jonkers, Sofie Debaere, Christophe Delecluse, Benedicte Vanwanseele
The aim of this study was to compare young and adult sprinters on several biomechanical parameters that were previously highlighted as performance-related and to determine the behaviour of several muscle-tendon units (MTU) in the first stance phase following a block start in sprint running. The ground reaction force (GRF) and kinematic data were collected from 16 adult and 21 young well-trained sprinters. No difference between the groups was found in some of the previously highlighted performance-related parameters (ankle joint stiffness, the range of dorsiflexion and plantar flexor moment)...
June 2018: Royal Society Open Science
Hiroshi Ishida, Tadanobu Suehiro, Keita Suzuki, Susumu Watanabe
This study aimed to assess the intra and interrater reliability of transducer tilt during the ultrasound (US) measurements of the muscle thickness and the echo intensity of the rectus femoris muscle (RF). Fourteen healthy male subjects (20.8 ± 0.8 years) participated in this study. The transducer tilt was measured using a digital angle gauge (°) during US. Two experimenters took two images to measure the muscle thickness (mm) and the echo intensity (a.u.: arbitrary unit). The intra and interclass correlation coefficient (ICC), standard error of measurement (SEM), and minimal detectable change (MDC) were also calculated...
July 2018: Journal of Bodywork and Movement Therapies
M Dienst, L Goebel, S Birk, D Kohn
OBJECTIVE: Reorientation of the acetabulum to normalize load transfer or avert femoroacetabular pincer impingement to prevent osteoarthritis of the hip. INDICATIONS: Persisting acetabular dysplasia after closure of growth plates or acetabular malrotation. CONTRAINDICATIONS: High dislocation of hip, secondary acetabulum, increased misalignment on functional X‑ray, high-grade mobility restriction. Relative: degenerative changes, advanced age...
August 10, 2018: Operative Orthopädie und Traumatologie
David A Krause, Joshua J Elliott, Domenic F Fraboni, Taylor J McWilliams, Rachel L Rebhan, John H Hollman
Background: The lunge is a closed kinetic chain exercise that athletes frequently use as part of training and rehabilitative programs. While typically performed on a stable surface, modifications include the use of balance platforms to create an unstable surface and suspension equipment. Suspension training exercises are theorized to be higher demand exercises and may be considered a progression from exercises on stable surfaces. Comparison of muscle recruitment between the suspended lunge and the standard lunge has not been reported...
April 2018: International Journal of Sports Physical Therapy
I-Hsuan Lin, Junn-Liang Chang, Kate Hua, Wan-Chen Huang, Ming-Ta Hsu, Yi-Fan Chen
BACKGROUND: Aging leads to decreased skeletal muscle function in mammals and is associated with a progressive loss of muscle mass, quality and strength. Age-related muscle loss (sarcopenia) is an important health problem associated with the aged population. RESULTS: We investigated the alteration of genome-wide transcription in mouse skeletal muscle tissue (rectus femoris muscle) during aging using a high-throughput sequencing technique. Analysis revealed significant transcriptional changes between skeletal muscles of mice at 3 (young group) and 24 (old group) months of age...
August 8, 2018: BMC Genetics
Richelle Baker, Pieter Coenen, Erin Howie, Ann Williamson, Leon Straker
Office workers are exposed to high levels of sedentary time. In addition to cardio-vascular and metabolic health risks, this sedentary time may have musculoskeletal and/or cognitive impacts on office workers. Participants (n = 20) undertook two hours of laboratory-based sitting computer work to investigate changes in discomfort and cognitive function (sustained attention and problem solving), along with muscle fatigue, movement and mental state. Over time, discomfort increased in all body areas (total body IRR [95% confidence interval]: 1...
August 7, 2018: International Journal of Environmental Research and Public Health
Oscar García-García, Alba Cuba-Dorado, Diego Fernández-Redondo, José López-Chicharro
The aim was to determine the predictive capacity of neuromuscular parameters on physiological predictors of performance related to pedaling power. The sample comprised fifty elite cyclists. On the same day, they were given a neuromuscular evaluation with tensiomyography (TMG) and then performed an effort test on a cycle ergometer until exhaustion. The TMG recorded the maximum radial muscle belly displacement, contraction time, delay time, derivative normalized response speed, and lateral symmetry. Peak power output (Wpeak·kg-1 ), effort time, maximum lactate concentration, power in the first lactate threshold, and power in the second lactate threshold were recorded in the effort test...
August 7, 2018: International Journal of Sports Medicine
Fabienne Schasfoort, Robert Pangalila, Emiel M Sneekes, Coriene Catsman, Jules Becher, Herwin Horemans, Henk J Stam, Annet J Dallmeijer, Johannes B J Bussmann
OBJECTIVE: Botulinum toxin (BoNT-A) is widely used in combined treatment for spastic cerebral palsy, but its added value preceding comprehensive rehabilitation for motor impairments, gait, and goal attainment has not been studied. DESIGN: A comparative multi-centre trial, in which two groups underwent comprehensive rehabilitation (i.e. high-intensive functional physiotherapy, and indicated casting/orthoses). One group received intramuscular BoNT-A prior to rehabilitation, and the other group did not receive BoNT-A...
August 6, 2018: Journal of Rehabilitation Medicine
Wenxin Niu, Lejun Wang, Chenghua Jiang, Ming Zhang
The objective of this study was to investigate the effect of dropping height on the forces of joints and muscles in lower extremities during landing. A total of 10 adult subjects were required to landing from three different heights (32 cm, 52 cm, and 72 cm), and the ground reaction force and kinematics of lower extremities were measured. Then, the experimental data were input into the AnyBody Modeling System, in which software the musculoskeletal system of each subject was modeled. The reverse dynamic analysis was done to calculate the joint and muscle forces for each landing trial, and the effect of dropping-landing on the results was evaluated...
2018: Journal of Healthcare Engineering
Elisabet Westerberg, Carl Johan Molin, Sören Spörndly Nees, Johan Widenfalk, Anna Rostedt Punga
There is a need for tailored exercise recommendations to patients with Myasthenia gravis (MG). A few pilot studies have recently shown that physical exercise in accordance with general recommendations to healthy adults can be applied safely to patients with mild MG symptoms. How physical exercise affects muscle parameters and risk factors for lifestyle diseases in patients with MG is, however, only poorly known. We evaluated functional skeletal muscle parameters in 11 MG patients, before and after conducting a 12-week supervised physical therapy regimen of aerobic and resistance strength training...
August 2018: Medicine (Baltimore)
Jason Michael Cholewa, Andrea Hudson, Taylor Cicholski, Amanda Cervenka, Karley Barreno, Kayla Broom, McKenzie Barch, Stuart A S Craig
BACKGROUND: Betaine supplementation has been shown to improve body composition and some metrics of muscular performance in young men; but, whether betaine enhances body composition or performance in female subjects is currently unknown. Therefore, the purpose of this study was to investigate the interaction between resistance training adaptation and chronic betaine supplementation in females. METHODS: Twenty-three young women (21.0 ± 1.4 years, 165.9 ± 6...
July 31, 2018: Journal of the International Society of Sports Nutrition
Meghan A Brown, Emma J Stevenson, Glyn Howatson
Tart Montmorency cherry concentrate (MC) has been reported to attenuate the symptoms of exercise-induced muscle damage (EIMD) and to accelerate exercise recovery, which has been attributed to its high anti-inflammatory and antioxidant properties. Although these data are promising, there are no data regarding exclusively female populations. Therefore, the aim of this investigation was to examine the efficacy of MC on recovery following EIMD in females. In a randomised, double-blind, placebo-controlled study, twenty physically active females (mean ± SD age 19 ± 1 y; stature 167 ± 6 cm; body mass 61...
July 28, 2018: European Journal of Sport Science
Eileen Armstrong, Andres Iriarte, Paula Nicolini, Jorge De Los Santos, Javier Ithurralde, Alejandro Bielli, Gianni Bianchi, Francisco Peñagaricano
Transcriptome deep sequencing is a powerful tool for exploring the genetic architecture of complex traits. Gene expression patterns may explain a high degree of the observed phenotypic differences in histochemical and metabolic parameters related to meat quality among different muscles. In this study, we sequenced by RNA-Seq the whole transcriptome of nine lamb muscles: Semimembranosus (SM), Semitendinosus (ST), Cranial gluteobiceps, Gluteus medius (GM), Rectus femoris, Supraspinatus (SS), Longissimus lumborum (LL), Adductor and Psoas major...
2018: PloS One
Randall Gutiérrez-Vargas, Saúl Martín-Rodríguez, Braulio Sánchez-Ureña, Alejandro Rodríguez-Montero, Jorge Salas-Cabrera, Juan C Gutiérrez-Vargas, Bostjan Simunic, Daniel Rojas-Valverde
Gutiérrez-Vargas, R, Martín-Rodríguez, S, Sánchez-Ureña, B, Rodríguez-Montero, A, Salas-Cabrera, J, Gutiérrez-Vargas, JC, Simunic, B, and Rojas-Valverde, D. Biochemical and muscle mechanical postmarathon changes in hot and humid conditions. J Strength Cond Res XX(X): 000-000, 2018-The aim of this study was to compare biochemical changes and mechanical changes in the lower-limb muscles before and after a marathon race in hot and humid conditions. Eighteen healthy runners participated in a marathon at between 28 and 34° C and 81% humidity in Costa Rica...
July 17, 2018: Journal of Strength and Conditioning Research
Soo-Han Kim, Se-Yeon Park
Recent studies have indicated that applying different breathing pattern and changes of extremity positions could be a useful way of performing challenging exercises that include coactivation of the abdominal muscles. The aim of this study was to investigate the effects of changes of breathing pattern and hip position on abdominal muscle activity during curl-up exercises. Surface electromyography responses of the rectus abdominis (RA), internal oblique (IO), external oblique (EO) muscles and rectus femoris (RF), and Borg rating of perceived exertion (Borg RPE) score were investigated during the curl up exercises...
June 2018: Journal of Exercise Rehabilitation
Yoann M Garnier, Christos Paizis, Romuald Lepers
The present study assessed neuromuscular and corticospinal changes during and after a fatiguing submaximal exercise of the knee extensors in different modes of muscle contraction. Twelve subjects performed two knee extensors exercises in a concentric or eccentric mode, at the same torque and with a similar total impulse. Exercises consisted of 10 sets of 10 repetitions at an intensity of 80% of the maximal voluntary isometric contraction torque (MVIC). MVIC, maximal voluntary activation level (VAL) and responses of electrically evoked contractions of the knee extensors were assessed before and after exercise...
July 17, 2018: European Journal of Sport Science
Haris Begovic, Filiz Can, Suha Yağcioğlu, Necla Ozturk
Stretching exercises are known for reduction of musculoskeletal stiffness and elongation of electromechanical delay (EMD). However, computing a change in stiffness by means of time delays, detected between onset of electromyographic (EMG), mechanomyographic (MMG) and force signals, can reveal changes in subcomponents (Δt EMG-MMG and Δt MMG-FORCE) of EMD after stretching. In our study, the effect of stretching was investigated while quadriceps femoris (QF) muscle performed isometric contractions. The EMG, MMG, and Force signals were recorded from rectus femoris (RF) and vastus medialis (VM) during five voluntarily isometric contractions at 15°, 30°, and 45° of knee flexion angle, while the leg was positioned on a custom-made device...
July 17, 2018: Physiotherapy Theory and Practice
Patrick M Tomko, Ryan J Colquhoun, Mitchel A Magrini, Tyler W D Muddle, Nathaniel D M Jenkins
OBJECTIVE: To determine if maximal isometric contraction (MVIC) method (i.e., ramp (MVICRAMP ) versus traditional MVIC) influences (1) maximal voluntary isometric torque (MVIT) production of the knee extensors, (2) electromyographic signal amplitude (EMGAMP ), and (3) EMG mean power frequency (EMGMPF ) of the rectus femoris and vastus lateralis in moderately-to highly-activated subjects. We hypothesized that EMGAMP would be greater during the MVICRAMP than MVIC muscle contractions, but that there would be no difference in MVIT...
July 10, 2018: Journal of Electromyography and Kinesiology
Jesús Olmo, Mikel Aramberri, Carlos Almaraz, Jack Nayler, Bernardo Requena
No abstract text is available yet for this article.
July 11, 2018: Physical Therapy in Sport
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