Academic literature on the topic 'Biceps femoris muscle'
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Journal articles on the topic "Biceps femoris muscle"
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Riccetti, Manon, Jules Opplert, Joao L. Q. Durigan, Carole Cometti, and Nicolas Babault. "Acute Static Stretching Results in Muscle-Specific Alterations amongst the Hamstring Muscles." Sports 8, no. 9 (August 30, 2020): 119. http://dx.doi.org/10.3390/sports8090119.
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This study aimed to explore the acute effects of static stretching on the musculotendinous properties of two hamstring muscles. Twelve male volunteers underwent two testing sessions. One session was dedicated to the evaluation of the semitendinosus muscle before (PRE) and after (POST) static stretching (five sets of 30-s stretching), and the other session similarly explored the long head of biceps femoris muscle. In addition to the displacement of the myotendinous junction (MTJ), passive torque and maximal voluntary isometric torque (MVIT) were evaluated. MVIT (−8.3 ± 10.2%, p = 0.0036, d = 0.497) and passive torque (−28.4 ± 16.9%, p = 0.0003, d = 1.017) were significantly decreased POST stretching. PRE stretching, MTJ displacement was significantly greater for semitendinosus muscle than biceps femoris muscle (27.0 ± 5.2 vs. 18.6 ± 3.6, p = 0.0011, d = 1.975). After the stretching procedure, greater MTJ displacement relative changes were observed for biceps femoris muscle as compared to semitendinosus muscle (22.4 ± 31.6 vs. −8.4 ± 17.9, p = 0.0167, d = 1.252). Because of the smaller MTJ displacement PRE stretching and greater alteration POST stretching in biceps femoris muscles, the present study demonstrated muscle-specific acute responses of hamstring muscles during stretching. Although stretching acutely impairs torque production, the passive torque reduction and alteration of MTJ displacement might impact hamstring injury prevention.
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Mateos-Angulo, Álvaro, José Andrés Salazar-Agulló, Cristina Roldán-Jiménez, Manuel Trinidad-Fernández, and Antonio Ignacio Cuesta-Vargas. "Ultrasonography Assessment Based on Muscle Thickness and Echo Intensity in Post-Polio Patients." Diagnostics 12, no. 11 (November 9, 2022): 2743. http://dx.doi.org/10.3390/diagnostics12112743.
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There is no specific designed diagnostic test for post-poliomyelitis syndrome. The most important symptoms of this syndrome are new loss of muscle strength and more fatigue. Previous studies have investigated muscle ultrasound parameters to distinguish neuromuscular disease patients from healthy controls. The aim of this study was to investigate if muscle thickness and echo intensity measured by ultrasound can discriminate post-poliomyelitis syndrome patients from healthy controls. A total of 29 post-polio patients and 27 healthy controls participated in this cross-sectional study. Anthropometric measures, muscle thickness, echo intensity using B-mode ultrasound in rectus femoris and biceps brachii muscles, and muscle strength test data were collected. Muscle thickness in rectus femoris was significantly lower in post-poliomyelitis patients than in healthy controls, but not in biceps brachii. Echo intensity in rectus femoris and biceps brachii was higher in post-poliomyelitis syndrome patients than in healthy controls. Correlations were found between muscle thickness and strength in the upper and lower limbs. The results of the present study showed that muscle thickness in rectus femoris and echo intensity in rectus femoris and biceps brachii can discriminate post-poliomyelitis syndrome patients from healthy controls. A better assessment is possible because it can observe differences and relevant parameters in this clinical population.
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Goodall, Alex F., David A. Broadbent, Raluca B. Dumitru, David L. Buckley, Ai Lyn Tan, Maya H. Buch, and John D. Biglands. "Feasibility of MRI based extracellular volume fraction and partition coefficient measurements in thigh muscle." British Journal of Radiology 93, no. 1111 (July 2020): 20190931. http://dx.doi.org/10.1259/bjr.20190931.
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Objective: This study aimed to assess the feasibility of extracellular volume-fraction (ECV) measurement, and time to achieve contrast equilibrium (CE), in healthy muscles, and to determine whether in-flow and partial-volume errors in the femoral artery affect measurements, and if there are differences in the partition coefficient (λ) between muscles. Methods: T1 was measured in the biceps femoris, vastus intermedius, femoral artery and aorta of 10 healthy participants. This was repeated alternately between the thigh and aorta for ≥25 min following a bolus of gadoterate meglumine. λ was calculated for each muscle/blood measurement. Time to CE was assessed semi-quantitatively. Results: 8/10 participants achieved CE. Time to CE = 19±2 min (mean ± 95% confidence interval). Measured λ: biceps femoris/aorta = 0.210±0.034, vastus intermedius/aorta = 0.165±0.015, biceps femoris/femoral artery = 0.265±0.054, vastus intermedius/femoral artery = 0.211±0.026. There were significant differences in λ between the muscles when using the same vessel (p < 0.05), and between λ calculated in the same muscle when using different vessels (p < 0.05). Conclusion: ECV measurements in the thigh are clinically feasible. The use of the femoral artery for the blood measurement is associated with small but significant differences in λ. ECV measurements are sensitive to differences between muscles within the healthy thigh. Advances in knowledge: This paper determines the time to contrast equilibrium in the healthy thigh and describes a method for measuring accurately ECV in skeletal muscle. This can aid in the diagnosis and understanding of inflammatory auto-immune diseases.
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Noghani Ardestani, Najme, Rahman Sheikhhoseini, and Farideh Babakhani. "Anticipatory Electromyographic Activity and Onset Time in Selected Muscles of Lower Limb Between the Active and Inactive Old Women." Journal of Exercise Science and Medicine 11, no. 2 (July 1, 2019): 89–96. http://dx.doi.org/10.32598/jesm.11.2.
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Introduction: This study aimed to investigate the onset time and the electromyographic activity level of the selected lower limb muscles in the active and inactive old women. Materials and Methods: In this case-control study, 28 old women with a Mean±SD age of 61.07±0.88 years were selected in the inactive (15 people) and active (13 people) groups. The electrical activity of the selected muscles of the lower limbs was collected by the EMG device in a stair down movement. Results: The onset time of tibialis anterior, vastus lateralis, and biceps femoris muscles are faster in the active group (p <0.05). Besides, the activity level of the rectus femoris muscle in the interval of 100 ms before the initial contact and the ratio of the vastus medialis muscle to the biceps femoris muscle was significantly lower (p <0.05) in the active group. Conclusion: It seems that the muscles of the lower limbs in the group of women with regular physical activity are activated faster than the inactive group and the decrease in the activity of the rectus femoris muscle and the ratio of the vastus medialis to the biceps femoris muscle in the active women may be accompanied by fatigue and reduced intra-articular forces. Therefore, it is recommended that old women participate in regular and active exercise programs to improve their onset times of muscle activity.
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Vaskoska, Rozita, Minh Ha, Zahra Batool Naqvi, Jason David White, and Robyn Dorothy Warner. "Muscle, Ageing and Temperature Influence the Changes in Texture, Cooking Loss and Shrinkage of Cooked Beef." Foods 9, no. 9 (September 14, 2020): 1289. http://dx.doi.org/10.3390/foods9091289.
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This study aimed to quantify the effect of muscle, ageing and cooking temperature on the texture, cooking loss and shrinkage of cooked beef. Cuboids from unaged (1 day post mortem) and aged (14 days post mortem) semitendinosus, biceps femoris and psoas major muscles, from both sides of five beef carcasses, were cooked at four different cooking temperatures (50, 60, 70 and 80 °C) for 30 min. and their Warner–Bratzler shear force (WBSF), cooking loss and shrinkage (longitudinal and transverse) were quantified. The WBSF was reduced by ageing in the muscles at the specific cooking temperatures: psoas major (cooked at 50, 60 and 80 °C), semitendinosus (70 and 80 °C) and biceps femoris (80 °C). The cooking loss was 3% greater in aged compared to unaged muscles. The longitudinal shrinkage was greatest in psoas major at 80 °C amongst the muscle types and it was reduced by ageing in psoas major (70 and 80 °C) and biceps femoris (80 °C). The transverse shrinkage was reduced by ageing only in biceps femoris, across all temperatures; and the diameter of homogenized fibre fragments from semitendinosus and biceps femoris was reduced more by cooking at 50 °C in unaged compared to aged condition. WBSF was related to transverse shrinkage, and cooking loss was related to longitudinal shrinkage. The effect of muscle type on the physical changes occurring during cooking of beef is dependent on ageing and cooking temperature.
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Vaz, João R., Tiago Neto, José Pedro Correia, Jorge Infante, and Sandro R. Freitas. "Regional Differences in Biceps Femoris Long Head Stiffness during Isometric Knee Flexion." Journal of Functional Morphology and Kinesiology 6, no. 1 (February 10, 2021): 18. http://dx.doi.org/10.3390/jfmk6010018.
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This study sought to investigate whether the stiffness of the biceps femoris long head differs between proximal and distal regions during isometric knee flexion at different contraction intensities and muscle lengths. Twelve healthy individuals performed knee flexion isometric contractions at 20% and 60% of maximum voluntary isometric contraction, with the knee flexed at 15 and 45 degrees. Muscle stiffness assessment was performed using ultrasound-based shear wave elastography. Proximal and distal regions of the biceps femoris long head were assessed. Biceps femoris long head muscle showed a greater stiffness (i) in the distal region, (ii) at higher contraction intensity, and (iii) at longer muscle length. The proximal-to-distal stiffness ratio was significantly lower than 1 (i.e., heterogenous) at lower contraction intensity regardless of the muscle length. However, this was not observed at higher contraction intensity. This study is the first to show heterogeneity in the active stiffness of the biceps femoris long head. Given the greater incidence of injury at the proximal region of biceps femoris long head, this study opens new directions for future research. Additionally, the present study results indicate that studies assessing muscle stiffness at one single muscle region should be interpreted with caution.
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Wilson, J. M. John, D. Gordon E. Robertson, and J. Peter Stothart. "Analysis of Lower Limb Muscle Function in Ergometer Rowing." International Journal of Sport Biomechanics 4, no. 4 (November 1988): 315–25. http://dx.doi.org/10.1123/ijsb.4.4.315.
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In an effort to seek further understanding of lower limb muscle function in the rowing movement, an electromyographic analysis was undertaken of rowers rowing on a Gjessing ergometer. A strain gauged transducer was inserted in the ergometer linkage between handle and flywheel to detect pulling force. Electrodes were placed on the following lower limb muscles: gluteus maximus, biceps femoris, rectus femoris, vastus lateralis, gastrocnemius, and tibialis anterior. Linear envelope electromyograms from each muscle and the force signals were sampled synchronously at 50 Hz. The results indicated that all six muscles were active from catch to finish of the drive phase. Biceps femoris, gluteus maximus, gastrocnemius, and vastus lateralis all began their activity at or just prior to catch and reached maximal excitation near peak force of the stroke. Rectus femoris and tibialis anterior activity began prior to the catch and reached maximal excitation subsequent to peak force. The coactivation of the five leg muscles, of which four were biarticular, included potentially antagonistic actions that would cancel each other’s effects. Clearly, however, other explanations must be considered. Both gastrocnemius and biceps femoris have been shown to act as knee extensors and may do so in the case of the rowing action. Furthermore, rectus femoris may act with unchanging length as a knee extensor by functioning as a rigid link between the pelvis and tibia. In this manner, energy created by the hip extensors is transferred across the knee joint via the isometrically contracting rectus femoris muscle.
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Budipitojo, Teguh, Ariana, Tri Wahyu Pangestiningsih, Hery Wijayanto, Dwi Liliek Kusindarta, and Dewi Kania Musana. "Studi Distribusi Glukosa Transporter 4 pada Otot Skelet Ayam Kedu Cemani." Jurnal Sain Veteriner 35, no. 2 (December 1, 2017): 254. http://dx.doi.org/10.22146/jsv.34698.
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Glucose transporter (GLUT 4) is glucose transporter protein regulated by insulin, found in adipose tissue and striated muscle (skeletal and cardiac muscle). Kedu cemani chicken is one of Indonesia endemic animal, found in Kedu, Temanggung regency, Central Java. This study was required to complete microscopic documentation of Indonesia’s native biodiversity. The objective of this study was to clarify GLUT 4 distribution in skeletal muscle fibers of kedu cemani chicken by using avidin-biotin-peroxidase complex (ABC) immunohistochemistry method. This study was conducted by using pectorales major, biceps brachii, and biceps femoris muscle tissue from 5 kedu cemani chicken. The result showed that GLUT 4 immunoreactivity were detected in sarcolemma and myofibrils component of pectorales major, biceps brachii, and biceps femoris muscle tissue. Intensity of GLUT 4 immunorectivites increased from weak intensity in pectorales major muscle tissue, moderate intensity in biceps brachii muscle tissue, then strong intensity in biceps femoris muscle tissue. This result might motivate to further exploration about the other kedu cemani chicken specific features to complete microscopic documentation of Indonesia’s native biodiversity.
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Andrés, A. I., J. Ruiz, A. I. Mayoral, J. F. Tejeda, and R. Cava. "Influence of rearing conditions and crossbreeding on muscle color in Iberian pigs Influencia de las condiciones de crianza y del cruce en el color de los músculos de cerdos Ibéricos." Food Science and Technology International 6, no. 4 (August 2000): 315–21. http://dx.doi.org/10.1177/108201320000600406.
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The effects of pig crossbreeding (Iberian versus Iberian x Duroc 50%) and rearing conditions (out doors versus indoors) on muscle fiber composition, myoglobin content and objective muscle color in biceps femoris and tibialis crancalis muscles have been studied. Muscle fibers were identified as types I, IIA, IIB, oxidative IIB and IIC and the proportion of each fiber type was determined by a computer ized image analysis. Color co-ordinates L*, a*, and b* were measured and both chroma ( C*) and hue angle ( h°) were calculated. Myoglobin content and chroma value were significantly higher in tibialis cranealis muscle than in biceps femoris muscle ( p ≤ 0.001), whereas the former muscle showed the lowest lightness and hue angle values ( p ≤ 0.001). Moreover, tibialis cranealis muscle exhibited a higher total proportion of oxidative fibers, types I, IIA and IIBx ( p ≤ 0.05), and a lower fat content than did biceps femoris muscle ( p ≤ 0.001). The muscles of pigs reared outdoors tended to show a higher per centage of oxidative fibers (type I) than did muscles from indoor reared pigs, although not to a sig nificant extent. Rearing conditions significantly affected color, muscles from outdoor reared pigs ex hibiting higher lightness ( L*), chroma ( C*) and hue angle ( h°) than muscles from indoor reared pigs. However, neither the crossbreeding nor the rearing conditions showed a significant influence on myoglobin concentration of muscles.
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ERTELT, THOMAS, and THOMAS GRONWALD. "THE CRITICAL BEHAVIOR OF THE M. BICEPS FEMORIS FOR THE RISK OF INJURY — A SIMULATION STUDY." Journal of Mechanics in Medicine and Biology 20, no. 01 (February 2020): 1950069. http://dx.doi.org/10.1142/s0219519419500696.
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The behavior of the M. biceps femoris with regard to its enormous vulnerability to injuries in sport remains unclear. Despite prevention programs, the rate of injuries of the hamstring muscles has risen by more than 4% in recent years. To get more insights into its function, the aim of this study was to examine the effect of different muscle insertion characteristics and activation levels using a simulation. We created a multi-segmented muscle model for evaluating the critical behavior of M. biceps femoris during a one-legged stopping maneuver. We analyzed muscle function, movement of the knee angle after initial ground contact, the simulated muscle force and the stop torques in the knee joint. The insertion geometry has an elementary effect on knee joint function and contributes to knee extension. The muscle activity plays a decisive role in elementary muscle function regarding the knee joint and in this regard the internal load of the M. biceps femoris increased without showing any visible effects on the kinematics. The anthropometry and function of this muscle needs to be taken into account to assess its effects on injury risk.
Dissertations / Theses on the topic "Biceps femoris muscle"
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Fernandes, Santos Amanda Aparecida. "The effect of joint angle on surface electromyography amplitude of hamstring muscles." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/231385/1/Amanda%20Aparecida_Fernandes%20Santos_Thesis.pdf.
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This thesis investigated the effect of knee angle position on the electrical signal of two hamstring muscles using a traditional technique (bipolar electromyography) and a modern technique (high-density electromyography). The results suggest that changes in knee position affect the electrical activity on bipolar electromyography and these changes are associated with the rotation of muscle fibers under the pair of electrodes. However, using high-density electromyography, there was no difference between different knee positions. These findings suggest that high-density electromyography has different responses compared to bipolar electromyography. Hence, studies using bipolar montages need to be interpreted with caution to avoid wrong conclusions.
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Muller, Brusco Clarissa. "Hamstring muscle architecture parameters in static and dynamic conditions using ultrasound imaging." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2571.
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Biceps femoris long head (BFlh) fascicle length (Lf), fascicle angle (FA), and muscle thickness (MT) were assessed at rest and during dynamic contractions using B-mode ultrasound imaging. The assessments were performed in men and women with no previous hamstring strain injury. Volunteers visited the laboratory for two separate data collection sessions (Day 1 and Day 2) relating to two independent projects, seven days apart at the same time of day for test-retest measurements of the static assessments. For the dynamic assessments, familiarization with the isokinetic concentric and eccentric knee flexion exercises were performed on Day 1. On Day 2, BFlh Lf, FA and MT were assessed in real time using two serially aligned ultrasound devices whilst performing consecutive concentric and eccentric knee flexions at 30°/s and 180°/s.
To acquire images at rest, ultrasound imaging was performed using extended field-of-view (EFOV) and static image acquisition sequences of four single images acquired in-series along the muscle. From these images, Lf was assessed using seven methods: EFOV, Collage, manual linear extrapolation, and using four different trigonometric equations, and then FA and MT were measured in EFOV, Collage, and Single images. Lf, FA and MT measured on Days 1 and 2 were not different (p > 0.05) for any method, reliabilities were very high (ICC: 0.91-0.98), and correlations were strong ( ≥ 0.84). Significant correlations (p < 0.05; r=0.67-0.98) were found between EFOV and the other measurement techniques for Lf, FA and MT. The Collage method had the highest reliability for Lf, and highest rank order and correlation with EFOV. The Collage method can therefore be recommended for use if the methodology presented herein is followed.
For assessments during dynamic contractions, participants performed consecutive concentric and eccentric contractions at 30°/s and 180°/s whilst in vivo muscle function was recorded using two in-series transducers. At 30°/s both submaximal (55% maximum) and maximal contractions were performed whilst at 180°/s only maximal contractions were performed both before and after fatiguing exercise. Ultrasound videos were exported and edited to create a single, synchronized video and three fascicles were analyzed through the range of motion. Changes during concentric and eccentric contractions (Δ) in Lf, FA and MT at short (60-90° knee angle; 0° full knee extension) and long (0-30°) muscle lengths and across the full knee flexion range were measured and compared. Comparisons were made within exercises performed with the same contraction velocity. When fascicle behaviors were compared during submaximal and maximal concentric and eccentric contractions at 30°/s, greater ΔLf was observed at longer muscle length during both eccentric and concentric contractions (p=0.01), and this alteration was greater during eccentric contractions (p=0.02) at longer muscle lengths (p < 0.001). Greater ΔFA was observed at long length during eccentric contractions (p=0.02). When whole range of motion was analyzed, greater ΔMT was observed (p=0.03) in concentric contractions. When fascicle behavior was compared in the maximal contractions at 180°/s before and after fatiguing exercise, greater ΔLf was observed in the eccentric contraction at the long muscle length (p = 0.01), ΔFA was greater at short muscle lengths in the concentric contractions (p=0.02) and at long muscle lengths (p=0.006) and at full range of motion (p=0.006) during eccentric contractions. Less ΔFA was detected across all contractions (p < 0.05) after the fatiguing exercise when measured through the full range of motion. Greater dynamic torque was observed at long muscle lengths, during eccentric contraction, and before the fatiguing exercise (p < 0.05).
Although the six different techniques used to estimate Lf during rest provided values similar to EFOV, the Collage sonographic method provided the most accurate and reliable results and is therefore recommended for BFlh architectural analysis when EFOV is not available. Greater ΔLf and ΔFA were observed for a given joint rotation increment during submaximal and maximal eccentric contractions at long muscle lengths. The increased fascicle strain at long muscle length might contribute to both increased metabolic stress, and therefore longer-term muscle hypertrophy, and to muscle strain injuries.
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Harada, Marcia Mayumi. "Efeito da desossa e da marinação sobre as características de processamento, físico-químicas e sensoriais do músculo Biceps femoris." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/11/11141/tde-19112004-150303/.
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O processo acelerado de obtenção da carne oferece grande vantagem à indústria, podendo encurtar alguns estágios de produção através da combinação de técnicas como a estimulação elétrica de carcaças, a desossa a quente e a marinação. O presente estudo foi realizado com o objetivo de avaliar a forma de desossa e o tipo de marinação em corte do músculo traseiro de bovinos (coxão duro) da raça Nelore. Determinou-se o efeito da desossa a quente e a frio e o efeito da salmoura de marinação, uma contendo 1,6% (250mM) de cloreto de cálcio e 2,4% de cloreto de sódio e outra com 1,8% de tripolifosfato de sódio e 2,4% de cloreto de sódio. Foram realizadas análises que incluíram a composição centesimal, teor de colágeno, pH, cor objetiva, textura objetiva (força de cisalhamento), perda de peso no cozimento e avaliação de maciez, suculência e sabor em cada músculo analisado. A marinação reduziu a força de cisalhamento, assim como aumentou a maciez e a suculência avaliadas pela equipe sensorial. Por outro lado a força de cisalhamento foi reduzida com a desossa quente e a maciez e a suculência aumentadas pela desossa frio. A cor foi o atributo mais afetado negativamente pelo processo de marinação, o valor a* e b* apresentou redução indicando escurecimento do vermelho, especialmente com a salmoura contendo cloreto de cálcio. A desossa interferiu no valor de a* e b* após o descongelamento indicando uma diminuição de a* e de b* na desossa quente. A desossa a quente poderá ser aplicada com sucesso em cortes bovinos provenientes de carcaças estimuladas eletricamente a baixa voltagem, sem provocar alterações negativas nos cortes. A marinação com salmoura contendo cloreto de sódio e tripolifosfato podem melhorar sensivelmente a maioria dos atributos avaliados, mas provoca alterações marcantes na cor.The accelerated process to obtain meat offer advantages to the meat industry, and can reduce some of the stages of production through electrical stimulation of carcass, hot boning and enhancement process. In this work muscles from top round (Bíceps femoris) from Nelore steers were deboned using conventional and hot processing and marinated. The effect of deboning process and two brine solutions containing 1,6% calcium chloride and 2,4% sodium chloride and 1,8% sodium tripolyphosphate and 2,4% sodium chloride were evaluated. Proximate percent composition, collagen, pH, colour, texture (Warner Bratzler shear force), cooking loss, tenderness, juiciness and flavor in each muscle were analysed. Enhacement process reduced shear force value, increased tenderness and juiciness from sensory panel. Otherwise the shear force was reduced with hot deboned and tenderness and juiciness reduced by conventional deboning. Colour analysis was affected by enhancement process, a* and b* value showed decreased indicating darkness red colour, specially with calcium chloride brine. Hot deboning can be succesfully used in beef meat in addition to low electrical stimulaton carcass without negative alteration in meat. Enhancement process with calcium chloride, sodium tripolyphosphate and sodium chloride can improve the major of analysed attributes, but provoke colour modifications.
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Sperlich, B., D. P. Born, K. Kaskinoro, K. K. Kalliokoski, and Marko Laaksonen. "Squeezing the Muscle : Compression Clothing and Muscle Metabolism during Recovery from High Intensity Exercise." Mittuniversitetet, Avdelningen för hälsovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-18973.
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The purpose of this experiment was to investigate skeletal muscle blood flow and glucose uptake in m. biceps (BF) and m. quadriceps femoris (QF) 1) during recovery from high intensity cycle exercise, and 2) while wearing a compression short applying ~37 mmHg to the thigh muscles. Blood flow and glucose uptake were measured in the compressed and non-compressed leg of 6 healthy men by using positron emission tomography. At baseline blood flow in QF (P = 0.79) and BF (P = 0.90) did not differ between the compressed and the non-compressed leg. During recovery muscle blood flow was higher compared to baseline in both compressed (P<0.01) and non-compressed QF (P<0.001) but not in compressed (P = 0.41) and non-compressed BF (P = 0.05; effect size = 2.74). During recovery blood flow was lower in compressed QF (P<0.01) but not in BF (P = 0.26) compared to the non-compressed muscles. During baseline and recovery no differences in blood flow were detected between the superficial and deep parts of QF in both, compressed (baseline P = 0.79; recovery P = 0.68) and non-compressed leg (baseline P = 0.64; recovery P = 0.06). During recovery glucose uptake was higher in QF compared to BF in both conditions (P<0.01) with no difference between the compressed and non-compressed thigh. Glucose uptake was higher in the deep compared to the superficial parts of QF (compression leg P = 0.02). These results demonstrate that wearing compression shorts with ~37 mmHg of external pressure reduces blood flow both in the deep and superficial regions of muscle tissue during recovery from high intensity exercise but does not affect glucose uptake in BF and QF. © 2013 Sperlich et al.:doi 10.1371/journal.pone.0060923
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Sarver, Amy G. "The ontogeny of myogenic regulatory factor expression during muscle differentiation in the biceps femoris and pectoralis major muscles of the chicken Appendix I. Isolation and characterization of microsatellite DNA in rainbow trout ; Appendix II. Analysis of myostatin expression during embryogenesis of the rainbow trout /." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2080.
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Thesis (M.S.)--West Virginia University, 2001.Title from document title page. Document formatted into pages; contains vii, 78 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 52-62).
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Obuz, Ersel. "Evaluation and modeling of cooking parameters to optimize tenderness of beef Biceps femoris and Longissimus lumborum muscles /." Search for this dissertation online, 2003. http://wwwlib.umi.com/cr/ksu/main.
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Zuccolotto, Deborah Gatti. "Analise eletromiografica dos musculos vastus medialis, vastus lateralis, semitendinosos e biceps femoris (caput longum) durante exercicio no aparelho "STEPPING MACHINE"." [s.n.], 1996. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290927.
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Orientador: Fausto BerzinDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A proposta deste trabalho foi observar o comportamento eletromiográfico dos músculos Vasto Medial Oblíquo, Vasto Lateral, Semitendíneo e Bíceps da Coxa (porção longa) durante atividade no aparelho "STEPPING MACHINE", tomando-se as medidas de ângulo 0°, 30°, 60°, 90° para a flexão e extensão da perna na articulação do joelho. Foram analisados 10 voluntários adultos normais, utilizando-se um eletromiógrafo de 8 canais, mini-eletrodos de superfície do tipo BECKMAN e um eletrogoniômetro. O método estatístico empregado foi a análise de variância (ANOVA) e o teste de Tukey. Os resultados mostraram que no movimento de flexão, o músculo Vasto Medial Oblíquo apresentou diferença dos potenciais médios de ação ao nível de 5% de significância para as medidas de ângulo 90°, 30° e 0° e também diferença sifnificante entre 60° e 0°. O músculo Vasto Lateral apresentou diferença significante também em 5% no ângulo 90° em relação °a 60°, 30° e 0°, além de diferença entre 60° e 0°. Os músculos semitendíneo e bíceps da coxa não apresentaram diferença significativa nas diferentes medidas de ângulo. Durante o movimento de extensão do joelho, os músculos Vasto Medial Oblíquo e Vasto Lateral, apresentaram diferença entre as medidas de ângulo 90° e 60° em relação às medidas 30° e 0°. Os músculos semitendíneo e bíceps da coxa, não apresentaram diferença significante entre os potenciais de ação nas várias angulações analisadas. Os resultados sugerem que o aparelho "STEPPING MACHINE" pode ser indicado na reabilitação pós-operatória da articulação do joelho
Abstract: The purpose of this paper was to observe the electromyographyc behaviors of the Vastus Medialis, Vastus Lateralis, Semitendineous and Biceps Femoris Muscles during activity in the Stepping Machine equipament, taking the angle measurement 0°, 30°, 60° and 90° for the leg flexion and extension in the knee joint. Ten normal adults volunteers were analysed by using a 8 channels electromyographer, mini surface electrode Beckman type and electrogoniometer. The statistics method utilized was the variance analysis (ANOVA) and the Tukey test. The results showed that in the joint movement Vastus Medialis Muscle presented difference of the medius potencials of action in 5% level of significance for the angle 90° measurement, 30° and 0° and significant difference among 60° and 0°. The Vastus Lateralis muscle presented significant difference also in the angle 90° in 5% in relation of 60°, 30° and 0°, beyond the difference among 60° and 0°. The semitendineous and biceps femoris muscles didn't present significant . difference in different measures of the angles. During the knee joint extension, the Vastus Medialis and Vastus Lateralis muscles presented difference among the 90° and 60° angles in relation to 30° and 60° measurement. The Semitendineous and Biceps Femoris didn't show difference significant among the potencials action in several angled analysed. The results suggest that the Stepping Machine can be indicate in the post-operation rehabilitation
Mestrado
Fisiologia e Biofisica do Sistema Estomatognatico
Mestre em Odontologia
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Tavares, Maria da Consolação Gomes Cunha Fernandes 1953. "Padrão de mobilidade articular e de registro eletromiografico do musculo biceps femoral de dançarinas." [s.n.], 1992. http://repositorio.unicamp.br/jspui/handle/REPOSIP/312254.
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Orientador : Vilma Cloris de CarvalhoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas
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Resumo: O objetivo deste trabalho foi analisar a mobilidade articular global,a amplitude de movimento de rotação lateral dos quadris, a angulação dos pés na posição "en dehor" e a atividade eletromiográfica do músculo bíceps femoral direito ,durante o movimento de "demi plié" na posição "en dehor", em função da incidência de lesões nos membros inferiores e queixas dolorosas nos joelhos, em dançarinas jovens. A amostra foi composta de 35 alunas do curso de dança UNICAMP , destras, de idade igualou inferior a 25 anos e com mais de cinco anos de treinamento técnico regular e ininterrupto para a dança e que submetidas a avaliação clínica minuciosa não apresentaram evidências de alterações patológicas que pudessem interferir nos resultados desta pesquisa. Foram realizados os seguintes procedimentos em cada indivíduo: -Avaliação clínica -Determinação do grau de mobilidade articular -Medida de rotação lateral dos quadris -Medida de angulação dos pés na posição "en dehor" -Eletromiografia de captação da porção longa do músculo bíceps femoral durante movimento de "demi plié" na posição "en dehor". Os dados obtidos foram processados estatisticamente evidenciando que o grau de mobilidade articular global e os registros eletromiográficos foram fundamentais para distinguir os grupo BOM ( assintomâtico e sem ocorrências de lesões nos membros inferiores) e PROBLEMA (com queixas de dor nos joelhos e incidência de duas ou mais lesões nos membros inferiores). No grupo PROBLEMA ,observamos maior dispersão dos dados relativos ao grau de mobilidade articular global. A atividade eletromiogrâfica discretamente mais elevada no repouso e durante a fase de extensão, mostrou se nitidamente mais intensa no final do movimento "demi plié", quando comparado com o grupo BOM. As medidas de amplitude dos movimentos de rotação lateral dos quadris e de angulação dos pés na posição "en dehor" foram semelhantes em ambos os grupos
Abstract: The aim of the present investigation was to analyze the global articular mobility, the hip lateral rotation motion amplitude, "en dehor" feet angulationand electromyographic activity of the right femoral biceps muscle, during "demi-plie" in "en dehor" position, as a functíon of injuries incidence in the inferior limb and pain complaint in the knees , in young dancers. The sample was composed with 35 right-handed students, from the Dance Department, UNICAMP , with age 25 or less and with five or more years of regular and continuous technical training for dance and that after careful clinical evaluation, do not show pathological evidences that could disturb the research results. In each subj ect, the following procedures were followed: -clinical evaluation. -Determination of articular mobility range. -Hips lateral rotation measurement. -"En dehor" feet angulation measurement. -Capture electromyograph of bíceps muscle, long portion , during "demi plie" "en dehor". AlI obtained data were statistically processed, clearly. showing that the global articular mobility and the electromyography were fundamental to allow a discrimination between groups GOOD (without history of injuries in the inferior limb as well as no pain complaint in the knees) and PROBLEM (with both history of injuries and pain complains) . In "the PROBLEM group, we observed a greater dispersion of data relating to the global articular mobility. The discrete more increased electromyograpy activity during the rest and in extension phase, was shown to be clearly more intense at the end of the "demi plie" movement , when compared with the GOOD group. Both movement amplitude in hip lateral rotation and "en dehor" feet angulation measured data were similar
Doutorado
Doutor em Medicina
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Villafranca, Alexander J. "Biceps Femoris Long Head and Short Head Muscle Modeling and Kinematics during Four Classes of Lower Limb Motion and Gait." 2010. http://hdl.handle.net/1993/4238.
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Theoretical mechanical benefits of biarticular muscles include reduced displacements and force potentiating shifts in linear velocities during multi-joint coupled motions. A cadaveric model was developed to compute muscle kinematics of biceps femoris (BFL and BFS) during four classes of coupled knee and hip joint motion, as well as running and walking gait (Six subjects, Vicon Motion Analysis). The examples of the classes of motion were: KEHE-jump (knee extension and hip extension), KFHF-tuck (knee flexion and hip flexion), KFHE-kick (knee flexion and hip extension), and KEHF-paw (knee extension and hip flexion). BFL peak and mean velocity shifts relative to BFS were seen in all four coupling classes (p<0.05) and the majority of the gait subclasses (p<0.05). Muscle displacements were larger in BFL for both KFHE-paw and KEHF-kick (p<0.05), smaller in KFHF-tuck (p<0.05), but not significantly different in KEHE-jump or during most of the running gait subclasses, except for during KFHE-late mid stance and KEHF-mid swing, where they were larger for BFL (p<0.05).
The mechanical benefits associated with BFL velocity shift relative to BFs were identified in KFHF, KEHF motions, and certain subclasses of gait. In contrast, there were potential mechanical detriments due to velocity shift relative to BFs in the KEHE-jump, KFHE-paw, and the majority of KEHE and KFHE subclasses in both gait cycles. The possible mechanical benefits associated with displacement conservation of BFL relative to BFs would be realized in KFHF-tuck jump, but not during KEHE-jump and the gait cycle subclasses. The findings of this study reveal both mechanical benefits and detriments of biarticular muscles, and have immediate implications for neural control of biarticular muscles during movement.
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Wu, Che-Hsiang, and 吳鍺湘. "Differential protein expression in Biceps femoris muscles with different tenderness in Taiwan country chickens." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/24492458489349117668.
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碩士國立中興大學
動物科學系所
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Taiwan country chickens (TCCs) which have intense flavors and superior textures satisfy the preference of consumers, and play an important role in the poultry market. Tenderness is one of the most important meat characteristics for the consumers, thus affect the acceptability of products to the consumers. Most proteomic studies in meat science focus on the factors affecting the meat quality of cattles and pigs, whereas few studies concern about chicken meat quality. Therefore, the current study was to investigate the differential protein expressions in thigh (Biceps femoris) muscles of TCCs with different tenderness and to explore the candidate biomarkers for improving meat characteristics in chickens. The B. femoris muscles from male Livestock Research Institute line 11 (LRI L11) at 16- and 20-wk-age were applied. The tenderness of B. femoris muscles was determined by measuring the shear force, collagen content, and soluble collagen percentage and ranked by different formulas. The B. femoris muscles with superior and worst three tenderness respectively were subjected to further proteomic analysis. The results show that there were 69 protein spots expressed differentially among all the 355 quantified protein spots. A total of 66 differentially expressed protein spots were identified by peptide mass fingerprinting and belonged to the 40 different proteins. These differentially expressed proteins which mainly located in cytoplasm (35%) and cytoskeleton (13%), involved in the molecular functions of protein binding (23%) and ion binding (18%). Most of them were participated in the biological processes of metabolic process (23%) and biological regulation process (18%). Phosphoglucomutase-1, phosphoglycerate mutase 1, aconitate hydratase, and triosephosphate isomerase were significantly upregulated in B. femoris muscles with higher tenderness in 16-wk-old TCCs. Pyruvate kinase was significantly upregulated in B. femoris muscle with higher tenderness in 20-wk-old TCCs. These proteins were related to glycolysis. Beta-enolase, desmin, and skeletal myosin heavy chain, which participated in energy metabolism and muscle structure, were significantly upregulated in B. femoris muscles with higher tenderness in both 16- and 20-wk-old TCCs. In conclusion, results of this study suggested that the tenderness of B. femoris muscles of TCCs may be associated with the proteins which related to the glycolysis muscle structure.
Book chapters on the topic "Biceps femoris muscle"
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Ghatak, Surajit, Sonali Adole, Debajani Deka, and Md Faizal. "A Case Report on Third Head of Biceps Femoris Muscle." In New Frontiers in Medicine and Medical Research Vol. 6, 114–20. Book Publisher International (a part of SCIENCEDOMAIN International), 2021. http://dx.doi.org/10.9734/bpi/nfmmr/v6/3606f.
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Carrasco, Dario I., and Arthur W. English. "Chapter 35 Mechanical Actions of Compartments of the Cat Hamstring Muscle, Biceps Femoris." In Progress in Brain Research, 397–403. Elsevier, 1999. http://dx.doi.org/10.1016/s0079-6123(08)62874-5.
Full textConference papers on the topic "Biceps femoris muscle"
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Rehorn, Michael R., and Silvia S. Blemker. "3D Finite Element Modeling of the Biceps Femoris Muscle." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206695.
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Hamstring strain injury is a significant problem for many athletes [1]. Muscle-tendon (MT) length changes and activation patterns during the sprinting cycle likely contribute to the high risk of injury. It has been suggested that injury may occur during the late swing phase of the sprinting cycle when the hamstring fibers experience activated muscle lengthening [2]. Of the hamstrings muscles, the biceps femoris longhead (BFLH) is the most commonly injured, with the injury most frequently localized along the proximal muscle-tendon junction [3]. We hypothesize that the injuries are localized in this region because it is also the area of highest localized strains.
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Silder, Amy, and Darryl G. Thelen. "Motion and Strain Along the Musculotendon Junction of the Biceps Femoris: Shortening vs. Lengthening Contractions." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-203590.
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Acute muscle strain injuries typically occur during active lengthening contractions, and tend to present along or near a musculotendon junction (MTJ) [1]. For example, among sprinters, the majority of hamstring strain injuries involve the proximal MTJ of the biceps femoris long head [1,2]. We have previously shown that post-injury scarring at the MTJ can persist for many months after return to sport [2], which may contribute to the high risk for re-injury associated with these injuries. Thus, it is pertinent to understand why the MTJ is susceptible to injury, and ultimately how post-injury remodeling may alter in-vivo mechanics. The purpose of the current study was to use dynamic magnetic resonance (MR) imaging to visualize muscle tissue displacements and mechanical strains during active lengthening contractions in the biceps femoris. We hypothesized that active lengthening contractions would induce greater mechanical strain along the proximal MTJ, when compared to shortening contractions of similar loads and ranges of motion.
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Zhou, Biyun, Xue Lihao, Xiaopeng Liu, Qing Yang, Liangsheng Ma, and Li Ding. "The physical load of the Human body during Motion with BP Neural Network." In 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1002613.
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Background: Unreasonable tasks will increase the person’s physical load, leading to safety accidents and occupational diseases. To ensure a reasonable physical load and improve the operational efficiency of the person as far as possible, it is necessary to predict and evaluate the physical load of workers in real-time.Objective: A prediction model of the physical load intensity of the human body based on a neural network was established, and its effectiveness was verified.Methods: Twelve volunteers completed four movements walking, jogging, climbing, and jumping. The surface electromyography (sEMG) on the left and right sides of the rectus femoris and biceps femoris was measured, and the motor posture of volunteers was obtained by Vicon, the joint torque, maximum muscle activity, and muscular force parameters were calculated based on the reverse dynamic model of human motion. The sEMG eigenvalue and mechanical load parameters in different postures were considered input and output, respectively, and 80% of all data were used as the training set and the rest as the validation set.Results: In this study, we found that the hip joint, knee joint, and ankle joint have a sizeable joint torque during movement, in which the joint torque of the ankle joint is the largest and twice human body weight at its peak. Besides, a larger muscle load occurs at the beginning and end of contact between the human foot and the ground, and the muscle strength of the rectus femoris was significantly higher than that of the biceps femoris (p<0.05). The number of neurons in the input layer, an output layer, and a hidden layer of the model is 32, 13, and 12, respectively. This study found that the prediction error of maximum muscle activity was 6.4%. The average prediction error of joint torque was 8.7%, and the prediction error of the muscular force of the rectus femoris muscle was no more than 9.5%. This model can reasonably predict the physical load of the human body.Conclusions: A workload evaluation model based on the BP neural network was established in this research, which can analyze the biomechanics of the human body in motion and judge the human body’s physical load effectively according to the EMG signal.Application: This model can measure the body load of soldiers and firefighters in real-time during task training and provide a reference for task design.
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Ko, Myeonghoon, Tiejun Ma, and Shuping Xiong. "Effects of carbon fiber insole on lower-extremity muscle activation and wearing comfort during treadmill running." In 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1002592.
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Background and Objective: Although the role of shoes on sports performance and injury has been extensively examined, only a few studies investigated the effects from insoles. Recent studies on carbon fiber insoles (CFI) on athletic performance reported that CFI could improve sports performance by reducing energy loss and increasing energy return. However, there are scarce reports on the effects of CFI on muscle fatigue and wearing comfort. While stiffer CFI insoles are superior in energy loss reduction and energy return, they could increase more muscle activation to absorb the shock or provide more propulsive force to push CFI, leading to increased muscle fatigue and discomfort. Therefore, this study aims to evaluate the effect of CFI on lower-extremity muscle activation and wearing comfort during treadmill running. Methods: Three types of insoles were compared, namely CFI, CFI with cushioning (CFIC), and a benchmark commercial insole (COM). Fifteen healthy young men participated in the experiment. Each participant wore the same sports shoe, three different insoles in a random order, and ran on a treadmill at a speed of 10 km/h for 5 minutes. Surface electromyography signals of four lower-extremity muscles (Rectus femoris, Tibialis anterior, Biceps femoris, and Gastrocnemius medialis) were recorded in real-time for measuring muscle activation. After completing a trial run with each experimental insole, the participants provided their subjective ratings on perceived insole stiffness, energy support, overall comfort, and fatigue. Analysis of variance (ANOVA) and post-hoc grouping analysis were conducted to statistically evaluate the effects from three different insoles. Paired t-test was performed to compare CFI and CFIC and explore any cushioning effect. Results: In terms of lower-extremity muscle activation, even though CFIC and COM showed no significant difference for all four lower-extremity muscles, CFI induced a marginally significant increase of 1.5% on Gastrocnemius medialis (p = 0.063) and a significant reduction of 0.7% on rectus femoris (p=0.011) than COM. For the subjective ratings, both CFI and CFIC were significantly stiffer than COM (p < 0.001), but there were no significant differences in overall comfort, energy support, and fatigue. Compared with CFI, CFIC significantly reduced Gastrocnemius medialis muscle usage by 2.1% (p = 0.012) and was marginally less stiff (p = 0.102).Conclusions: This preliminary study showed that the carbon fiber insole CFI induced higher calf muscle usage and was perceived to be stiffer during treadmill running, which could contribute to provide the propulsive force for better sports performance. Carbon fiber insole with cushioning (CFIC) can help to relieve muscular fatigue. Further research should be conducted to examine the carbon insole effects on sports performance and long-term muscle activation and perceived feelings.
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Williams, Glenn N., Peter J. Barrance, Lynn Snyder-Mackler, and Thomas S. Buchanan. "Effect of Anterior Cruciate Ligament Reconstruction With an Autologous Semitendinosus-Gracilis Graft on Neuromuscular Function." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43031.
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The quadrupled semitendinosus-gracilis (ST-G) graft is rapidly becoming the graft of choice for orthopaedic surgeons when reconstructing the anterior cruciate ligament (ACL). During this procedure orthopaedic surgeons harvest the distal semitendinosus and gracilis tendons and use them to replace the ruptured ACL. Although people who undergo this procedure have good functional outcomes over the short-term, we do not know the effect that harvesting these two tendons has on neuromuscular function. The purpose of this study was to examine the effect that ACL reconstruction with an autologous ST-G had on musculotendinous morphology. The methods used in the study included digital reconstruction of knee musculature from magnetic resonance images (MRI). Marked reductions in muscle volume, cross-sectional area, and length were observed in the semitendinosus and gracilis when reassessed approximately 6 months following surgery (after the subjects had returned to sports participation). The subjects appeared to compensate for the diminished medial knee flexor function with the biceps femoris (a lateral muscle) and semimembranosus muscles. These findings may have important implications for joint loading, the long term health of the knee, and surgical decision-making.
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Oztekin, Haluk Hayri, Nuri Suha Bayindir, and Aytug Guner. "Preventing Anterior Translation of the Human Knee Joint by Contracting the Biceps Femoris Muscle Using an Accelerometer and an Electrical Muscle Stimulator Device." In 2019 Medical Technologies Congress (TIPTEKNO). IEEE, 2019. http://dx.doi.org/10.1109/tiptekno.2019.8895201.
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Rosas-Hernández, Anel, Tejinder Kaur, Julián Andrés Gómez-Salazar, José Luis Olvera-Cervantes, Alonso Corona-Chávez, Roberto Rojas-Laguna, Anel Rosas-Hernández, and M. E. Sosa-Morales. "<i>Dielectric properties of pork muscle (</i>Biceps femoris<i>) in the microwave range affected by the gender</i>." In 2018 Detroit, Michigan July 29 - August 1, 2018. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2018. http://dx.doi.org/10.13031/aim.201801751.
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Riyanto, J., Sudibya, S. D. Widyawati, and Mulyani. "The effect of using the soybeans groat protected in the ration on the physical quality of the meat of the muscle parts of Longissimus dorsi and Biceps femoris thin-tailed sheep." In INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5141723.
Full textReports on the topic "Biceps femoris muscle"
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Halevy, Orna, Sandra Velleman, and Shlomo Yahav. Early post-hatch thermal stress effects on broiler muscle development and performance. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7597933.bard.
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In broilers, the immediate post-hatch handling period exposes chicks to cold or hot thermal stress, with potentially harmful consequences to product quantity and quality that could threaten poultry meat marketability as a healthy, low-fat food. This lower performance includes adverse effects on muscle growth and damage to muscle structure (e.g., less protein and more fat deposition). A leading candidate for mediating the effects of thermal stress on muscle growth and development is a unique group of skeletal muscle cells known as adult myoblasts (satellite cells). Satellite cells are multipotential stem cells that can be stimulated to follow other developmental pathways, especially adipogenesis in lieu of muscle formation. They are most active during the first week of age in broilers and have been shown to be sensitive to environmental conditions and nutritional status. The hypothesis of the present study was that immediate post-hatch thermal stress would harm broiler growth and performance. In particular, growth characteristics and gene expression of muscle progenitor cells (i.e., satellite cells) will be affected, leading to increased fat deposition, resulting in long-term changes in muscle structure and a reduction in meat yield. The in vitro studies on cultured satellite cells derived from different muscle, have demonstrated that, anaerobic pectoralis major satellite cells are more predisposed to adipogenic conversion and more sensitive during myogenic proliferation and differentiation than aerobic biceps femoris cells when challenged to both hot and cold thermal stress. These results corroborated the in vivo studies, establishing that chronic heat exposure of broiler chicks at their first two week of life leads to impaired myogenicity of the satellite cells, and increased fat deposition in the muscle. Moreover, chronic exposure of chicks to inaccurate temperature, in particular to heat vs. cold, during their early posthatch periods has long-term effects of BW, absolute muscle growth and muscle morphology and meat quality. The latter is manifested by higher lipid and collagen deposition and may lead to the white striping occurrence. The results of this study emphasize the high sensitivity of muscle progenitor cells in the early posthatch period at a time when they are highly active and therefore the importance of rearing broiler chicks under accurate ambient temperatures. From an agricultural point of view, this research clearly demonstrates the immediate and long-term adverse effects on broiler muscling and fat formation due to chronic exposure to hot stress vs. cold temperatures at early age posthatch. These findings will aid in developing management strategies to improve broiler performance in Israel and the USA. BARD Report - Project4592 Page 2 of 29