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Sebastian Färber, Dieter Heinrich, Inge Werner, Peter Federolf
Activation of the hamstrings has been discussed as a measure for reducing strain on the ACL during jump landings in alpine skiing. The current study tested the hypothesis that hamstring and quadriceps activation can be voluntarily increased by the athlete. Specifically, two different instructions - to increase hamstring activation or to increase upper-leg co-contraction - were compared to normal landings. Eight members of the German national and junior national squad in freestyle skiing (age 19.6 ± 3.8 years; weight 66...
June 18, 2018: Journal of Sports Sciences
Naasson Trindade Cavanellas, Victor Rodrigues Amaral Cossich, Eduardo Becker Nicoliche, Marilena Bezerra Martins, Eduardo Branco de Sousa, José Inácio Salles
Objective: Compare the maximal isokinetic muscle strength of knee extensor and flexor muscles between patients with knee osteoarthritis and patients submitted to total knee arthroplasty. Methods: Volunteers were divided into five groups ( n  = 20): Control; Ahlbäck I and II; Ahlbäck IV; six months after total knee arthroplasty; 12 months after total knee arthroplasty. An isokinetic knee strength evaluation was conducted for the quadriceps and hamstrings at 60°/s...
March 2018: Revista Brasileira de Ortopedia
Sezen Çimen Polat, Celal Bulgay, İmdat Yarım, Halil İbrahim Cicioğlu, Ebru Çetin
The purpose of this study is to examine the correlation between leg power and balance performance in elite wrestlers and injury history. In the research group, there are 18 elite freestyle male wrestlers at the ages of 24.27 ± 3.18 years, with a height of 171.86 ± 5.44 cm and a body weight of 79.27 ± 11.16 kg. Information on the injury history of the athletes’ upper legs for the past year was collected via interviews with the club’s physiotherapist. Laboratory tests to measure performance assessed height, body weight, Y balance and isokinetic leg strength...
April 17, 2018: Sports (Basel)
Leyla Alizadeh Ebadi, Ebru Çetin
The aim of this study was to determine the acute effect of static stretching on hamstring and quadriceps muscles' isokinetic strength when applied for various durations to elite athletes, to investigate the effect of different static stretching durations on isokinetic strength, and finally to determine the optimal stretching duration. Fifteen elite male athletes from two different sport branches (10 football and five basketball) participated in this study. Experimental protocol was designed as 17 repetitive static stretching exercises for hamstring and quadriceps muscle groups according to the indicated experimental protocols; ((A) 5 min jogging; (B) 5 min jogging followed by 15 s static stretching; (C) 5 min jogging followed by 30 s static stretching; (D) 5 min jogging, followed by static stretching for 45 s)...
March 13, 2018: Sports (Basel)
Louise A Beveridge, Rosemary J G Price, Louise A Burton, Miles D Witham, Allan D Struthers, Deepa Sumukadas
OBJECTIVE: Magnetic femoral nerve stimulation to test muscle function has been largely unexplored in older people. We assessed acceptability, feasibility, along with reproducibility and correlation with other physical function measures. RESULTS: Study 1 recruited older people with sarcopenia. Stimulation was performed at baseline and 2 weeks along with six minute walk (6MW), maximum voluntary quadriceps contraction, short physical performance battery and grip strength...
June 15, 2018: BMC Research Notes
Nosratollah Hedayatpour, Zahra Izanloo, Deborah Falla
High intensity eccentric exercise induces muscle fiber damage and associated delayed-onset muscle soreness (DOMS) resulting in an impaired ability of the muscle to generate voluntary force. This study investigates the extent to which DOMS, induced by high intensity eccentric exercise, can affect the activation and performance of the non-exercised homologous muscle of the contralateral limb. Healthy volunteers performed maximal voluntary contractions of knee extension and sustained isometric knee extension at 50% of maximal force until task failure on both the ipsilateral exercised limb and the contralateral limb...
June 6, 2018: Journal of Electromyography and Kinesiology
Im-Rak Choi, Jung-Hoon Lee
BACKGROUND: Controversy exists regarding whether the kinesiology tape application direction affects muscle strength. METHODS: Eighteen healthy volunteers (12 men, 6 women) participated. Kinesiology tape was randomly applied to the quadriceps muscles either from origin to insertion or from insertion to origin. A Biodex isokinetic dynamometer was used to measure the peak torque of the quadriceps pre-and post-taping. RESULTS: There was a significant difference in muscle strength after taping, regardless of the kinesiology tape application direction...
June 2018: Medicine (Baltimore)
Grant E Norte, Jay N Hertel, Susan A Saliba, David R Diduch, Joseph M Hart
CONTEXT:   Central and peripheral neural adaptations have been identified after anterior cruciate ligament (ACL) injury and reconstruction (ACLR) and are hypothesized to contribute to posttraumatic muscle dysfunction. Limited evidence exists about the temporal nature of neuromuscular adaptations during early and late-term phases of recovery after ACLR, and no researchers have studied patients with posttraumatic osteoarthritis. OBJECTIVE:   To compare quadriceps neuromuscular function less than 2 years ( early) and more than 2 years ( late) after ACLR, including in patients who experienced posttraumatic knee osteoarthritis...
June 12, 2018: Journal of Athletic Training
A Bilmont, M Retournard, E Asimus, S Palierne, A Autefage
OBJECTIVES:  This study evaluated the effects of tibial plateau levelling osteotomy on cranial tibial subluxation and tibial rotation angle in a model of feline cranial cruciate ligament deficient stifle joint. METHODS:  Quadriceps and gastrocnemius muscles were simulated with cables, turnbuckles and a spring in an ex vivo limb model. Cranial tibial subluxation and tibial rotation angle were measured radiographically before and after cranial cruciate ligament section, and after tibial plateau levelling osteotomy, at postoperative tibial plateau angles of +5°, 0° and -5°...
June 11, 2018: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
Corinne Sommi, Frances Gill, Jeffrey D Trojan, Mary K Mulcahey
OBJECTIVES: Despite evidence that strength and conditioning (S&C) programs decrease injury risk and increase sport performance, young females are rarely offered S&C programs comparable to those of their male counterparts. The purpose of this study was to evaluate the current body of available literature regarding S&C in adolescent female athletes, describe potential benefits, and generate recommendations for S&C programs for female adolescent athletes. METHODS: The systematic review was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines...
June 9, 2018: Physician and Sportsmedicine
Ibrahim M Altubasi
BACKGROUND: Knee osteoarthritis is a common and a disabling musculoskeletal disorder. Patients with knee osteoarthritis have activity limitations which are linked to the strength of the quadriceps muscle. Previous research reported that the relationship between quadriceps muscle strength and physical function is moderated by the level of knee joint frontal plane laxity. The purpose of the current study is to reexamine the moderation effect of the knee joint laxity as measured by stress radiographs on the relationship between quadriceps muscle strength and physical function...
June 7, 2018: Knee
M K Rossi, K Pasanen, A Heinonen, G Myklebust, P Kannus, U M Kujala, K Tokola, J Parkkari
The aim of this study was to investigate the incidence of back pain in young basketball and floorball players under 21 years of age. The secondary aim was to examine risk factors especially for low back pain (LBP). Nine basketball and nine floorball teams (n=396) participated in this prospective follow-up study (2011-2014). Young athletes (mean age 15.8±1.9) performed physical tests and completed a questionnaire at baseline. The follow-up lasted one to three years per player. During the follow-up, back pain reported by the players was registered on a weekly basis and verified by a study physician...
June 8, 2018: Scandinavian Journal of Medicine & Science in Sports
Antonio J Morales-Artacho, Paulino Padial, Amador García-Ramos, Alejandro Pérez-Castilla, Javier Argüelles-Cienfuegos, Blanca De la Fuente, Belén Feriche
Intermittent hypoxic resistance training (IHRT) may help to maximize the adaptations following resistance training, although conflicting evidence is available. The aim of this study was to explore the influence of moderate altitude on the functional, neural and muscle architecture responses of the quadriceps muscles following a power-oriented IHRT intervention. Twenty-four active males completed two 4-week consecutive training blocks comprising general strengthening exercises (weeks 1-4) and power-oriented resistance training (weeks 5-8)...
2018: Frontiers in Physiology
Alexander Conant, Julian Curiel, Amy Pizzino, Parisa Sabetrasekh, Jennifer Murphy, Miriam Bloom, Sarah H Evans, Guy Helman, Ryan J Taft, Cas Simons, Matthew T Whitehead, Steven A Moore, Adeline Vanderver
Leukodystrophies and genetic leukoencephalopathies are a heterogeneous group of heritable disorders that affect the glial-axonal unit. As more patients with unsolved leukodystrophies and genetic leukoencephalopathies undergo next generation sequencing, causative mutations in genes leading to central hypomyelination are being identified. Two such individuals presented with arthrogryposis multiplex congenita, congenital hypomyelinating neuropathy, and central hypomyelination with early respiratory failure. Whole exome sequencing identified biallelic mutations in the CNTNAP1 gene: homozygous c...
January 1, 2018: Journal of Child Neurology
Daria Guseva, Igor Jakovcevski, Andrey Irintchev, Iryna Leshchyns'ka, Vladimir Sytnyk, Evgeni Ponimaskin, Melitta Schachner
The close homolog of L1 (CHL1) is a cell adhesion molecule involved in regulation of neuronal differentiation and survival, neurite outgrowth and axon guidance during development. In the mature nervous system, CHL1 regulates synaptic activity and plasticity. The aim of the present study was to evaluate the influence of CHL1 on peripheral nerve regeneration after trauma. Using the established model of mouse femoral nerve regeneration, CHL1 knock-out mice were investigated in comparison to the wild type littermates...
2018: Frontiers in Molecular Neuroscience
Themistoklis Tzatzairis, Aliki Fiska, Athanasios Ververidis, Konstantinos Tilkeridis, Konstantinos Kazakos, Georgios I Drosos
Background: Life expectancy lengthening and aging of population resulted in dramatically increase of patients with osteoarthritis. Total knee arthroplasty is widely used as the gold standard in order to relieve pain, correct deformity and restore function. A contemporary and controversial topic, is that of minimally invasive surgery for TKA. The minimally invasive approaches are based on the concept that they don't violate the extensor mechanism, resulting in earlier functional recovery, shorter hospital stay and enhanced patients' overall satisfaction...
June 2018: Journal of Orthopaedics
Jarrad M Stevens, Nicholas D Clement, Gavin Macpherson, James T Patton
Purpose: This study aimed to evaluate the mobility and excursion of the patella achieved by two different techniques for increasing exposure to the knee joint: the quadriceps snip and the extensile medial parapatellar approach. Method: Six matched intact fresh frozen cadaveric knees were used in this study. A standard medial parapatellar approach was undertaken and the patella excursion with a constant force of 5 kg was measured based on two fixed points at 0, 45 and 90 °s of knee flexion...
June 2018: Journal of Orthopaedics
Sarah Schlaeger, Friedemann Freitag, Elisabeth Klupp, Michael Dieckmeyer, Dominik Weidlich, Stephanie Inhuber, Marcus Deschauer, Benedikt Schoser, Sarah Bublitz, Federica Montagnese, Claus Zimmer, Ernst J Rummeny, Dimitrios C Karampinos, Jan S Kirschke, Thomas Baum
Magnetic resonance imaging (MRI) can non-invasively assess muscle anatomy, exercise effects and pathologies with different underlying causes such as neuromuscular diseases (NMD). Quantitative MRI including fat fraction mapping using chemical shift encoding-based water-fat MRI has emerged for reliable determination of muscle volume and fat composition. The data analysis of water-fat images requires segmentation of the different muscles which has been mainly performed manually in the past and is a very time consuming process, currently limiting the clinical applicability...
2018: PloS One
Jennifer J Beck, Daniel V Boguszewski, Nirav B Joshi, Edward C Cheung, Richard E Bowen, William L Oppenheim
OBJECTIVES: Defining normal pediatric patellar height is complicated. Current methods use ratios calculated from lateral radiographs, but often provide inconsistent results and are time-consuming. It has been observed that the angle formed by Blumensaat's line and the distal femoral physis, when extended, form an area of patellar containment throughout a range of knee flexion. Deemed the Blumensaat-Epiphyseal Containment of the Knee (BECK) Angle, the objective of this study was to investigate this as a simple alternative to identify normal pediatric patellar height...
June 6, 2018: Journal of Pediatric Orthopedics. Part B
Zhong-You Zeng, Zhao-Wan Xu, Deng-Wei He, Xing Zhao, Wei-Hu Ma, Wen-Fei Ni, Yong-Xing Song, Jian-Qiao Zhang, Wei Yu, Xiang-Qian Fang, Zhi-Jie Zhou, Nan-Jian Xu, Wen-Jian Huang, Zhi-Chao Hu, Ai-Lian Wu, Jian-Fei Ji, Jian-Fu Han, Shun-Wu Fan, Feng-Dong Zhao, Hui Jin, Fei Pei, Shi-Yang Fan, De-Xiu Sui
OBJECTIVE: To analyze the early complications and causes of oblique lateral interbody fusion, and put forward preventive measures. METHODS: There were 235 patients (79 males and 156 females) analyzed in our study from October 2014 to May 2017. The average age was 61.9 ± 0.21 years (from 32 to 83 years). Ninety-one cases were treated with oblique lateral interbody fusion (OLIF) alone (OLIF alone group) and 144 with OLIF combined with posterior pedicle screw fixation through the intermuscular space approach (OLIF combined group)...
May 2018: Orthopaedic Surgery
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