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https://www.readbyqxmd.com/read/29351161/effects-of-contrast-strength-vs-plyometric-training-on-lower-limb-explosive-performance-ability-to-change-direction-and-neuromuscular-adaptation-in-soccer-players
#1
Mehrez Hammami, Nawel Gaamouri, Roy J Shephard, Mohamed Souhaiel Chelly
The aim was to compare the effects of two differing 8-week in-season strength training programs (contrast strength training [CST] vs. plyometric training [PT]) on selected performance tests (5 and 40m sprints, S 4 X 5 m change of direction test, squat (SJ) and countermovement (CMJ) jumps , leg peak power on a cycle ergometer force-velocity test, 1-repetition maximal (1-RM) half squat, and electromyographic [EMG] activity of the vastus lateralis, vastus medialis and rectus femoris muscles during vertical jump tests)...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29351051/voluntary-ambulation-using-voluntary-upper-limb-muscle-activity-and-hybrid-assistive-limb%C3%A2-hal%C3%A2-in-a-patient-with-complete-paraplegia-due-to-chronic-spinal-cord-injury-a-case-report
#2
Yukiyo Shimizu, Hideki Kadone, Shigeki Kubota, Kenji Suzuki, Kousaku Saotome, Tomoyuki Ueno, Tetsuya Abe, Aiki Marushima, Hiroki Watanabe, Ayumu Endo, Kazue Tsurumi, Ryu Ishimoto, Akira Matsushita, Masao Koda, Akira Matsumura, Yoshiyuki Sankai, Yasushi Hada, Masashi Yamazaki
CONTEXT: We sought to describe our experience with the Hybrid Assistive Limb® (HAL®) for active knee extension and voluntary ambulation with remaining muscle activity in a patient with complete paraplegia after spinal cord injury. FINDINGS: A 30-year-old man with complete paraplegia used the HAL® for 1 month (10 sessions) using his remaining muscle activity, including hip flexor and upper limb activity. Electromyography was used to evaluate muscle activity of the gluteus maximus, tensor fascia lata, quadriceps femoris, and hamstring muscles in synchronization with the Vicon motion capture system...
January 19, 2018: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/29349990/-experimentation-of-the-relationship-between-medial-or-lateral-patellar-stabilizer-and-patellofemoral-stabilization
#3
Xing-Sen Liang, Zheng-Hong Yu, Yi-Kai Li, Ying-Ping Jiang, Xian-Wu Chen, Min Huang
OBJECTIVE: To study the contribution of medial or lateral stabilizer to the stability of the patella, to explore the function and effect of releasing the LPR clinically and to provide a biomechanical basis for the clinical treatment of patellar instability(PI). METHODS: The quadriceps femoris of 6 fresh human cadaver knees were loaded to simulate a normal condition of muscle strength. First the loading force was measured and recorded, which subluxated the patella with the different degrees of knee flexion...
April 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29344706/long-term-follow-up-of-1217-consecutive-short-stem-total-hip-arthroplasty-tha-a-retrospective-single-center-experience
#4
REVIEW
H Wacha, G Domsel, E Herrmann
BACKGROUND: An arthroplasty registry in Germany has been recently established but long-term results for most short-stem innovations are missing. Short-stem hip arthroplasty is usually indicated in young active patients. Our indication was extended to older age groups, femoral neck fractures (FNF), and dysplasia. We evaluated all total hip arthroplasties (THAs) in this population with a collum femoris preserving stem (CFP) performed from 2003 to 2013. METHODS: A consecutive cohort of 1217 CFP THAs with a mean age of 68...
January 17, 2018: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/29344054/the-carnitine-status-does-not-affect-the-contractile-and-metabolic-phenotype-of-skeletal-muscle-in-pigs
#5
Daniel Kaup, Janine Keller, Erika Most, Joachim Geyer, Klaus Eder, Robert Ringseis
Background: Recently, supplementation of L-carnitine to obese rats was found to improve the carnitine status and to counteract an obesity-induced muscle fiber transition from type I to type II. However, it has not been resolved if the change of muscle fiber distribution induced in obese rats and the restoration of the "normal" muscle fiber distribution, which is found in lean rats, in obese rats by supplemental L-carnitine is causally linked with the carnitine status. In the present study we hypothesized that fiber type distribution in skeletal muscle is dependent on carnitine status...
2018: Nutrition & Metabolism
https://www.readbyqxmd.com/read/29342313/collagen-xii-myopathy-with-rectus-femoris-atrophy-and-collagen-xii-retention-in-fibroblasts
#6
Nanna Witting, Thomas Krag, Ulla Werlauff, Morten Duno, Sofie Thuroe Oestergaard, Julia Rebecka Dahlqvist, John Vissing
INTRODUCTION: Mutation in the collagen XII gene (COL12A1) was recently reported to induce Bethlem myopathy. We describe a family affected by collagen XII-related myopathy in 3 generations. METHODS: Systematic interview, clinical examination, skin biopsies and MRI muscle. RESULTS: The phenotype was characterized by neonatal hypotonia, contractures and delayed motor development followed by resolution of contractures and a motor performance limited by reduced endurance...
January 17, 2018: Muscle & Nerve
https://www.readbyqxmd.com/read/29340933/forces-generated-by-vastus-lateralis-and-vastus-medialis-decrease-with-increasing-stair-descent-speed
#7
Elena J Caruthers, Kassandra K Oxendale, Jacqueline M Lewis, Ajit M W Chaudhari, Laura C Schmitt, Thomas M Best, Robert A Siston
Stair descent (SD) is a common, difficult task for populations who are elderly or have orthopaedic pathologies. Joint torques of young, healthy populations during SD increase at the hip and ankle with increasing speed but not at the knee, contrasting torque patterns during gait. To better understand the sources of the knee torque pattern, we used dynamic simulations to estimate knee muscle forces and how they modulate center of mass (COM) acceleration across SD speeds (slow, self-selected, and fast) in young, healthy adults...
January 16, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29339983/analysis-of-the-hamstring-muscle-activation-during-two-injury-prevention-exercises
#8
Alireza Monajati, Eneko Larumbe-Zabala, Mark Goss-Sampson, Fernando Naclerio
The aim of this study was to perform an electromyographic and kinetic comparison of two commonly used hamstring eccentric strengthening exercises: Nordic Curl and Ball Leg Curl. After determining the maximum isometric voluntary contraction of the knee flexors, ten female athletes performed 3 repetitions of both the Nordic Curl and Ball Leg Curl, while knee angular displacement and electromyografic activity of the biceps femoris and semitendinosus were monitored. No significant differences were found between biceps femoris and semitendinosus activation in both the Nordic Curl and Ball Leg Curl...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29336361/muscle-magnetic-resonance-imaging-for-the-differentiation-of-multiple-acyl-coa-dehydrogenase-deficiency-and-immune-mediated-necrotizing-myopathy
#9
Ya-Wen Zhao, Xiu-Juan Liu, Wei Zhang, Zhao-Xia Wang, Yun Yuan
BACKGROUND: Clinically, it is difficult to differentiate multiple acyl-CoA dehydrogenase deficiency (MADD) from immune-mediated necrotizing myopathy (IMNM) because they display similar symptoms. This study aimed to determine whether muscle magnetic resonance imaging (MRI) could be used for differential diagnosis between MADD and IMNM. METHODS: The study evaluated 25 MADD patients, confirmed by muscle biopsy and ETFDH gene testing, and 30 IMNM patients, confirmed by muscle biopsy...
January 20, 2018: Chinese Medical Journal
https://www.readbyqxmd.com/read/29332757/activation-of-lower-limb-muscles-with-different-types-of-mount-in-hippotherapy
#10
Mariane Fernandes Ribeiro, Ana Paula Espindula, Domingos Emanuel Bevilacqua Júnior, Jéssica Aparecida Tolentino, Carolina Fioroni Ribeiro da Silva, Márcia Fernandes Araújo, Alex Abadio Ferreira, Vicente de Paula Antunes Teixeira
OBJECTIVES: To analyze muscle activation of lower limbs (LL) of subjects in hippotherapy sessions. METHODS: The study included 10 healthy subjects, five male and five female, with an average age of 24.03 (±4.06) years. Subjects underwent four hippotherapy sessions of 30 min with interval of one week, and each session was performed with a different type of mount material in the following order: 1st performed with saddle and feet in the stirrups (S1), 2nd with saddle and feet off the stirrups (S2), 3rd with blanket and feet off the stirrup (S3) and 4th with blanket and feet in the stirrups (S4)...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29332743/myoeletric-indices-of-fatigue-adopting-different-rest-intervals-during-leg-press-sets
#11
Humberto Miranda, Marianna Maia, Carlos G de Oliveira, Déborah Farias, Jurandir B da Silva, Vicente P Lima, Jeffrey M Willardson, Gabriel A Paz
INTRODUCTION: The purpose of this study was to examine the acute effect of different rest intervals between multiple sets of the 45° angled leg press exercise (LP45) on surface electromyographic (SEMG) spectral and amplitude indices of fatigue. METHODS: Fifteen recreationally trained females performed three protocols in a randomized crossover design; each consisting of four sets of 10 repetitions with 1 (P1), 3 (P3), or 5 (P5) minute rest intervals between sets...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29332742/the-effects-of-dorso-lumbar-motion-restriction-on-emg-activity-of-selected-muscles-during-running
#12
Joseph J Morley, Edward Traum
The effects of restricting dorso-lumbar spine mobility on electromyographic activity of the erector spinae, quadriceps femoris, hamstrings and gastrocnemius muscles in runners was investigated. Thermoplastic casting material was fashioned into a rigid orthosis and used to restrict spinal motion during running. Volunteers ran on a treadmill at 2.78 m/sec, under normal conditions and with spinal motion restricted. Surface electromyographic data was collected during both sets of trials. Normal electromyographic data was also compared with previous authors to determine similarity with their electromyographic data...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29332740/an-electromyographic-analysis-of-selected-asana-in-experienced-yogic-practitioners
#13
Kathleen Kelley, Katherine Slattery, Kaitlyn Apollo
The purpose of this study was to assess electromyographic (EMG) output of the anterior tibialis (TA), medial head of the gastrocnemius (GA), rectus femoris (RF), bicep femoris (BF), and gluteus medius (GM) in experienced yogic practitioners during selected yoga asana. A secondary purpose was to examine the differences in EMG output in unilateral V. bilateral standing yoga asana. The study was a single occasion descriptive design. Thirteen healthy yoga practitioners (1 male, 12 females, average age of 37.5) with more than five years of experience were recruited...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29324877/impact-of-extra-articular-pathologies-on-groin-pain-an-arthroscopic-evaluation
#14
Mitsunori Kaya
PURPOSE: For patients who have anterior hip pain evaluated by Patrick's test and tenderness at Scarpa's triangle, we perform periarticular debridement based on the hypothesis that extra-articular pathologies are responsible for the hip pain. The purpose of this study was to categorize the endoscopic extra-articular findings and to evaluate the clinical significance of periarticular pathologies in anterior hip pain. METHODS: Arthroscopic findings of 77 patients who underwent periarthritic debridement were evaluated...
2018: PloS One
https://www.readbyqxmd.com/read/29315583/the-effect-of-cooking-temperatures-on-the-aggregation-and-digestion-rate-of-myofibrillar-proteins-in-jinhua-ham
#15
Chang-Yu Zhou, Dao-Dong Pan, Yang-Ying Sun, Chun-Bao Li, Xing-Lian Xu, Jin-Xuan Cao, Guang-Hong Zhou
BACKGROUND: In order to evaluate the effect of cooking temperatures on the nutrition quality of dry-cured hams, 60 biceps femoris samples from 16 Jinhua hams were divided into four groups (the control, 70, 100 and 120 °C) and cooked for 30 min. Carbonyls content, sulfhydryl groups, surface hydrophobicity, microstructure, proteins aggregation and digestibility of myofibrillar proteins were investigated. RESULTS: Cooking promoted the carbonylation and decreased sulfhydryl groups in temperatures-dependent ways...
January 9, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29314071/sarcolemmal-excitability-changes-in-normal-human-aging
#16
James Hf Lee, Robert Boland-Freitas, Karl Ng
INTRODUCTION: The exact mechanisms underlying the loss of skeletal muscle bulk and power with normal human aging are not well established. Muscle velocity recovery cycles (MVRC) is an in vivo neurophysiological technique which we employed to assess the impact of age on sarcolemmal excitability. METHODS: MVRC recordings were obtained from tibialis anterior (n=74) and rectus femoris (n=32) muscles from 74 healthy subjects (18-84 years, median age 35, interquartile range 29-55) Results: Increasing age was linearly associated with longer muscle relative refractory period (MRRP) and reduced early supernormality (ESN) in both tibialis anterior (MRRP: r2 =0...
January 4, 2018: Muscle & Nerve
https://www.readbyqxmd.com/read/29304102/activation-of-biceps-femoris-long-head-reduces-tibiofemoral-anterior-shear-force-and-tibial-internal-rotation-torque-in-healthy-subjects
#17
Nur Liyana Azmi, Ziyun Ding, Rui Xu, Anthony M J Bull
The anterior cruciate ligament (ACL) provides resistance to tibial internal rotation torque and anterior shear at the knee. ACL deficiency results in knee instability. Optimisation of muscle contraction through functional electrical stimulation (FES) offers the prospect of mitigating the destabilising effects of ACL deficiency. The hypothesis of this study is that activation of the biceps femoris long head (BFLH) reduces the tibial internal rotation torque and the anterior shear force at the knee. Gait data of twelve healthy subjects were measured with and without the application of FES and taken as inputs to a computational musculoskeletal model...
2018: PloS One
https://www.readbyqxmd.com/read/29299479/are-the-anatomy-textbooks-wrong-a-clinical-patho-anatomic-study-of-foveal-vessels-in-the-round-ligament-of-the-hip
#18
John W Barrington, Nipun Sodhi, Muzaffar Ali, Anton Khlopas, Assem A Sultan, James R Kee, Kristopher A Holmes, Omar Hariri, Jared M Newman, Michael A Mont
Background: The foveal vessels of the ligamentum teres are an anterior branch of the posterior division of the obturator artery, providing blood to the capitis of the femoral head. However, the basic anatomic description of foveal vasculature in the ligamentum teres of the hip is widely variable, with some studies reporting that the vessels are not patent in roughly one third of all adults. Therefore, the purpose of this study was to evaluate the status of foveal vessels in primary total hip arthroplasty (THA) patients...
December 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29291007/alteration-of-muscle-fiber-characteristics-and-the-ampk-sirt1-pgc-1%C3%AE-axis-in-skeletal-muscle-of-growing-pigs-fed-low-protein-diets-with-varying-branched-chain-amino-acid-ratios
#19
Yehui Duan, Fengna Li, Wenlong Wang, Qiuping Guo, Chaoyue Wen, Yulong Yin
There mainly exists four major myosin heavy chains (MyHC) (i.e., I, IIa, IIx, and IIb) in growing pigs. The current study aimed to explore the effects of low-protein diets supplemented with varying branched-chain amino acids (BCAAs) on muscle fiber characteristics and the AMPK-SIRT1-PGC-1α axis in skeletal muscles. Forty growing pigs (9.85 ± 0.35 kg) were allotted to 5 groups and fed with diets supplemented with varying leucine: isoleucine: valine ratios: 1:0.51:0.63 (20% crude protein, CP), 1:1:1 (17% CP), 1:0...
December 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/29290379/relationships-between-muscle-mass-intramuscular-adipose-and-fibrous-tissues-of-the-quadriceps-and-gait-independence-in-chronic-stroke-survivors-a-cross-sectional-study
#20
Naoki Akazawa, Kazuhiro Harada, Naomi Okawa, Kimiyuki Tamura, Atsushi Hayase, Hideki Moriyama
OBJECTIVE: To examine the relationships between muscle mass, intramuscular adipose and fibrous tissues of the quadriceps, and gait independence in chronic stroke survivors. DESIGN: Cross-sectional study. SETTING: Hospital-based research. PARTICIPANTS: Seventeen chronic stroke survivors who were unable to walk independently (non-independent walker group) and 11 chronic stroke survivors who were able to walk independently (independent walker group) participated in this study...
December 1, 2017: Physiotherapy
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