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https://www.readbyqxmd.com/read/29143379/region-dependent-hamstrings-activity-in-nordic-hamstring-exercise-and-stiff-leg-deadlift-defined-with-high-density-emg
#1
András Hegyi, Annamária Péter, Taija Finni, Neil J Cronin
Recent studies suggest region-specific metabolic activity in hamstring muscles during injury prevention exercises, but the neural representation of this phenomenon is unknown. The aim of this study was to examine whether regional differences are evident in the activity of biceps femoris long head (BFlh) and semitendinosus (ST) muscles during two common injury prevention exercises. Twelve male participants without a history of hamstring injury performed the Nordic hamstring exercise (NHE) and stiff-leg deadlift (SDL) while BFlh and ST activity were recorded with high-density electromyography (HD-EMG)...
November 15, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29143267/hamstring-injury-prevention-practices-in-elite-sport-evidence-for-eccentric-strength-vs-lumbo-pelvic-training
#2
REVIEW
Anthony J Shield, Matthew N Bourne
Hamstring strain injuries are endemic in running-based sports. Given the economic and performance implications of these injuries, a significant body of research has emerged in recent years in an attempt to identify risk factors and develop or optimise injury prevention strategies. Surveys of injury prevention practices among medical and conditioning staff in elite sport suggest that many sporting clubs invest significant efforts in eccentric hamstring conditioning and lumbo-pelvic or trunk stability programmes...
November 15, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29137729/the-shear-wave-elastic-modulus-and-the-increased-nuclear-factor-kappa-b-nf-kb-p65-and-cyclooxygenase-2-cox-2-expression-in-the-area-of-myofascial-trigger-points-activated-in-a-rat-model-by-blunt-trauma-to-the-vastus-medialis
#3
Hengyong Lv, Zhen Li, Tiantian Hu, Yuexiang Wang, Jinpeng Wu, Yingxin Li
We aimed to elucidate the increased inflammatory cytokines expression such as nuclear factor kappa B (NF-kB/p65), cyclooxygenase-2 (COX-2), and voltage-gated calcium channels (VGCC) in the area of activated myofascial trigger points (MTrPs) in a rat model by blunt trauma to the vastus medialis and to evaluate the feasibility of a quantitative analysis of muscle elastic modulus using shear wave elastography (SWE). Twelve 7-week-old male SD rats were divided into normal (NM, n = 6) and model groups (MO, n = 6)...
November 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29126339/the-force-velocity-relationship-in-older-people-reliability-and-validity-of-a-systematic-procedure
#4
Julian Alcazar, Carlos Rodriguez-Lopez, Ignacio Ara, Ana Alfaro-Acha, Asier Mañas-Bote, Amelia Guadalupe-Grau, Francisco Jose García-García, Luis M Alegre
This study compared the reliability and validity of different protocols evaluating the force-velocity (F-V) relationship and muscle power in older adults. Thirty-one older men and women (75.8±4.7 years) underwent two F-V tests by collecting the mean and peak force and velocity data exerted against increasing loads until one repetition maximum (1RM) was achieved in the leg press exercise. Two attempts per load were performed, with a third attempt when F-V points deviated from the linear F-V regression equation...
November 10, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29116573/an-evidence-based-framework-for-strengthening-exercises-to-prevent-hamstring-injury
#5
REVIEW
Matthew N Bourne, Ryan G Timmins, David A Opar, Tania Pizzari, Joshua D Ruddy, Casey Sims, Morgan D Williams, Anthony J Shield
Strength training is a valuable component of hamstring strain injury prevention programmes; however, in recent years a significant body of work has emerged to suggest that the acute responses and chronic adaptations to training with different exercises are heterogeneous. Unfortunately, these research findings do not appear to have uniformly influenced clinical guidelines for exercise selection in hamstring injury prevention or rehabilitation programmes. The purpose of this review was to provide the practitioner with an evidence-base from which to prescribe strengthening exercises to mitigate the risk of hamstring injury...
November 7, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29114528/effect-of-compression-garments-on-delayed-onset-muscle-soreness-and-blood-inflammatory-markers-after-eccentric-exercise-a-randomized-controlled-trial
#6
Jieun Kim, Jooyoung Kim, Joohyung Lee
The purpose of this study was to investigate how compression garments, applied after eccentric exercise, can affect delayed onset muscle soreness (DOMS) and inflammatory markers. Sixteen healthy male university students enrolled in this study and were randomly assigned to either the compression garment group (CG, n=8) or control group (CON, n=8). All participants performed two sets of eccentric exercise using elbow flexor with 25 repetitions per set on a modified preacher curl machine. Maximal isometric strength was measured before exercise and immediately, 24, 48, 72, and 96 hr after eccentric exercise...
October 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29114510/effect-of-timing-of-whey-protein-supplement-on-muscle-damage-markers-after-eccentric-exercise
#7
Jooyoung Kim, Chulhyun Lee, Joohyung Lee
Whey protein is a nutritional supplement commonly ingested for recovery following exercise. However, the timing when whey protein supplement must be ingested after muscle-damaging exercise is debatable. Therefore, the present study investigated the effects of the timing of supplement ingestion on muscle damage markers after eccentric or muscle-damaging exercise. In total, 32 collegiate male students participated in this study; they were randomly assigned to control group (n=8), before supplement group (n=8), after supplement group (n=8), or before and after supplement group (n=8)...
August 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29113570/a-novel-downhill-gait-training-program-following-a-total-knee-arthroplasty-a-case-report-highlighting-the-impacts-of-self-selected-speed-on-gait-symmetry
#8
Cody Blue, Sara Coomes, Yuri Yoshida
Study Design Case report. Background Walking plays an essential role in activities of daily living that lead to varied health benefits. Studies report gait speed and symmetry are impacted in individuals following TKA. Unfortunately, abnormal gait patterns persistently exist in individuals after TKA. Downhill walking may provide a simple and feasible exercise regimen to improve gait patterns. The purpose of this case report is to describe the application of a downhill treadmill training program and the subsequent changes in gait patterns in an individual following a unilateral TKA...
November 7, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29112054/lower-extremity-stiffness-considerations-for-testing-performance-enhancement-and-injury-risk
#9
Jon Brazier, Sean Maloney, Chris Bishop, Paul J Read, Anthony N Turner
Brazier, J, Maloney, S, Bishop, C, Read, PJ, and Turner, AN. Lower extremity stiffness: considerations for testing, performance enhancement, and injury risk. J Strength Cond Res XX(X): 000-000, 2017-Force-deformation characteristics of the lower limb have been associated with athletic performance and may modulate the risk of injury. Despite these known associations, measurements of lower extremity stiffness are not commonly administered by strength and conditioning coaches. This review provides an overview of the available literature pertaining to the effects of lower extremity stiffness on physical performance and injury risk...
November 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29109129/histopathological-nature-of-myofascial-trigger-points-at-different-stages-of-recovery-from-injury-in-a-rat-model
#10
Hui Zhang, Jiao-Jiao Lü, Qiang-Min Huang, Lin Liu, Qing-Guang Liu, Opoku-Antwi Eric
OBJECTIVE: To investigate the histopathological nature of myofascial trigger points (MTrPs) or spots (MTrSs) at different stages of recovery from injury in arat model. METHODS: Forty Sprague-Dawley rats were randomly divided into two groups: a control group (CG) and experimental group (EG). The CG was further randomly subdivided into CG1 and CG2 subgroups. The CG2 was used for palpating the taut band and CG1 as a blank. EG was subdivided into three groups according to recovery times: 4 weeks (4W), 8 weeks (8W) and 12 weeks (12W); these groups consisted of eight rats each...
November 6, 2017: Acupuncture in Medicine: Journal of the British Medical Acupuncture Society
https://www.readbyqxmd.com/read/29106812/whey-protein-hydrolysate-supplementation-accelerates-recovery-from-exercise-induced-muscle-damage-in-females
#11
Meghan A Brown, Emma J Stevenson, Glyn Howatson
A number of different forms of protein and their analogues have been investigated for their efficacy in ameliorating exercise-induced muscle damage (EIMD) and recovery. Preliminary data regarding whey protein hydrolysate (WPH) supplementation are promising. However, its efficacy beyond acute eccentric/resistance exercise bouts or longer-term training programmes are limited and all investigations have been conducted in male or mixed-sex groups. This study sought to elucidate whether the benefits of WPH previously reported can be demonstrated in females following repeated-sprint exercise...
November 6, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29099680/pre-exercise-infrared-photobiomodulation-therapy-810%C3%A2-nm-in-skeletal-muscle-performance-and-postexercise-recovery-in-humans-what-is-the-optimal-power-output
#12
Adriano Rodrigues de Oliveira, Adriane Aver Vanin, Shaiane Silva Tomazoni, Eduardo Foschini Miranda, Gianna Móes Albuquerque-Pontes, Thiago De Marchi, Vanessa Dos Santos Grandinetti, Paulo Roberto Vicente de Paiva, Treice Beatriz Gonçalves Imperatori, Paulo de Tarso Camillo de Carvalho, Jan Magnus Bjordal, Ernesto Cesar Pinto Leal-Junior
BACKGROUND: Photobiomodulation therapy (PBMT) has recently been used to alleviate postexercise muscle fatigue and enhance recovery, demonstrating positive results. A previous study by our research group demonstrated the optimal dose for an infrared wavelength (810 nm), but the outcomes could be optimized further with the determination of the optimal output power. OBJECTIVE: The aim of the present study was to evaluate the effects of PBMT (through low-level laser therapy) on postexercise skeletal muscle recovery and identify the best output power...
November 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29081259/brain-activation-associated-with-eccentric-movement-a-narrative-review-of-the-literature
#13
Stéphane Perrey
The movement occurring when a muscle exerts tension while lengthening is known as eccentric muscle action. Literature contains limited evidence on how our brain controls eccentric movement. However, how the cortical regions in the motor network are activated during eccentric muscle actions may be critical for understanding the underlying control mechanism of eccentric movements encountered in daily tasks. This is a novel topic that has only recently begun to be investigated through advancements in neuroimaging methods (electroencephalography, EEG; functional magnetic resonance imaging, fMRI)...
October 29, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29078826/noninsertional-tendinopathy-of-the-achilles
#14
REVIEW
Avreeta Singh, Arash Calafi, Chris Diefenbach, Chris Kreulen, Eric Giza
Noninsertional Achilles tendinosis is differentiated from insertional Achilles tendinosis based on anatomic location. Tendinosis, as opposed to tendonitis, is primarily a degenerative process and the role of inflammation is believed limited. The etiology of Achilles tendinopathy may include overuse leading to repetitive microtrauma, poor vascularity of the tissue, mechanical imbalances of the extremity, or combination of these elements. There is evidence to support eccentric exercise nonoperative management for patients with noninsertional Achilles tendinopathy...
December 2017: Foot and Ankle Clinics
https://www.readbyqxmd.com/read/29077637/contralateral-repeated-bout-effect-of-the-knee-flexors
#15
Trevor C Chen, Ming-Ju Lin, Hsin-Lian Chen, Hui-Yi Yu, Kazunori Nosaka
PURPOSE: Eccentric exercise of the elbow flexors (EF) confers protective effect against muscle damage of the same exercise performed by the opposite arm at 1, 7 or 28 days later. This is known as the contralateral repeated bout effect (CL-RBE), but it is not known whether CL-RBE is evident for the knee flexors (KF). The present study tested the hypothesis that KF CL-RBE would be observed at 1, 7 and 28 days after the initial bout. METHODS: Young untrained men were assigned to a control or one of three experimental groups (n=13/group)...
October 26, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29074289/gait-biomechanics-of-skipping-are-substantially-different-than-those-of-running
#16
Jessica McDonnell, John D Willson, Kevin A Zwetsloot, Joseph Houmard, Paul DeVita
The inherit injury risk associated with high-impact exercises calls for alternative ways to achieve the benefits of aerobic exercise while minimizing excessive stresses to body tissues. Skipping presents such an alternative, incorporating double support, flight, and single support phases. We used ground reaction forces (GRFs), lower extremity joint torques and powers to compare skipping and running in 20 healthy adults. The two consecutive skipping steps on each limb differed significantly from each other, and from running...
October 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29073840/a-novel-apparatus-measuring-knee-flexor-strength-during-various-hamstring-exercises-a-reliability-and-retrospective-study
#17
Jack T Hickey, Peter F Hickey, Nirav Maniar, Ryan G Timmins, Morgan D Williams, Christian A Pitcher, David A Opar
Study Design Reliability and case-control injury study. Background Knee flexor strength is a key variable when dealing with hamstring strain injury (HSI) and methodologies of objective measurement are often limited to single exercises. Objectives To establish test re-test reliability of a novel apparatus measuring knee flexor strength during various hamstring exercises; to investigate whether these measures detect between-leg differences in males with and without history of unilateral HSI. Methods Twenty males without and ten males with previous unilateral HSI participated...
October 26, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29072027/effect-of-stretching-based-rehabilitation-on-pain-flexibility-and-muscle-strength-in-dancers-with-hamstring-injury-a-single-blind-prospective-randomized-clinical-trial
#18
Giwon Kim, Hyangsun Kim, Woo K Kim, Junesun Kim
BACKGROUND: Hamstring injuries commonly occur in mainstream sports and occupations that involve physical activity. We evaluated the effect of a stretching-based rehabilitation program on pain, flexibility, and strength in dancers with hamstring injuries. METHODS: Sixteen Korean traditional dancers with unilateral hamstring injuries were included and randomly assigned to a rehabilitation or control group. The rehabilitation group received stretching-based rehabilitation for 8 weeks, which comprised simple static stretches and basic range of motion (ROM) exercises, such as static and active stretching, concentric and eccentric ROM training, and trunk stabilization exercises...
October 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29068866/does-flywheel-paradigm-training-improve-muscle-volume-and-force-a-meta-analysis
#19
Francisco J Nuñez Sanchez, Eduardo Sáez de Villarreal
Núñez Sanchez, FJ and Sáez de Villarreal, E. Does flywheel paradigm training improve muscle volume and force? A meta-analysis. J Strength Cond Res 31(11): 3177-3186, 2017-Several studies have confirmed the efficacy of flywheel paradigm training for improving or benefiting muscle volume and force. A meta-analysis of 13 studies with a total of 18 effect sizes was performed to analyse the role of various factors on the effectiveness of flywheel paradigm training. The following inclusion criteria were employed for the analysis: (a) randomized studies; (b) high validity and reliability instruments; (c) published in a high quality peer-reviewed journal; (d) healthy participants; (e) studies where the eccentric programme were described; and (f) studies where increases in muscle volume and force were measured before and after training...
November 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29065533/leucine-enriched-essential-amino-acids-augment-muscle-glycogen-content-in-rats-seven-days-after-eccentric-contraction
#20
Hiroyuki Kato, Kyoko Miura, Katsuya Suzuki, Makoto Bannai
Eccentric contractions induce muscle damage, which impairs recovery of glycogen and adenosine tri-phosphate (ATP) content over several days. Leucine-enriched essential amino acids (LEAAs) enhance the recovery in muscles that are damaged after eccentric contractions. However, the role of LEAAs in this process remains unclear. We evaluated the content in glycogen and high energy phosphates molecules (phosphocreatine (PCr), adenosine di-phosphate (ADP) and ATP) in rats that were following electrically stimulated eccentric contractions...
October 23, 2017: Nutrients
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