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https://www.readbyqxmd.com/read/29781992/muscle-imbalances-testing-and-training-functional-eccentric-hamstring-strength-in-athletic-populations
#1
Petr Stastny, Michal Lehnert, James J Tufano
Many hamstring injuries that occur during physical activity occur while the muscles are lengthening, during eccentric hamstring muscle actions. Opposite of these eccentric hamstring actions are concentric quadriceps actions, where the larger and likely stronger quadriceps straighten the knee. Therefore, to stabilize the lower limbs during movement, the hamstrings must eccentrically combat against the strong knee-straightening torque of the quadriceps. As such, eccentric hamstring strength expressed relative to concentric quadricep strength is commonly referred to as the "functional ratio" as most movements in sports require simultaneous concentric knee extension and eccentric knee flexion...
May 1, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29780836/defining-platelet-rich-plasma-usage-by-team-physicians-in-elite-athletes
#2
David E Kantrowitz, Ajay S Padaki, Christopher S Ahmad, T Sean Lynch
Background: The indications for the use of platelet-rich plasma (PRP) are vaguely defined despite the frequency of its use as a treatment for athletes. While select studies have advocated for its efficacy, the majority of orthopaedic research conducted on the topic has been equivocal. Purpose: To define the use of PRP in elite athletes by team physicians from professional sports leagues. Study Design: Cross-sectional study. Methods: A survey assessing treatment timing, usage patterns, indications, and complications was generated by fellowship-trained sports medicine orthopaedic surgeons...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29780834/factors-affecting-the-achievement-of-a-patient-acceptable-symptom-state-1-year-after-anterior-cruciate-ligament-reconstruction-a-cohort-study-of-343-patients-from-2-registries
#3
Eric Hamrin Senorski, Eleonor Svantesson, Susanne Beischer, Alberto Grassi, Ferid Krupic, Roland Thomeé, Kristian Samuelsson
Background: There is insufficient knowledge regarding the influence of concomitant injuries on the recovery of short-term subjective knee function after anterior cruciate ligament (ACL) reconstruction. Purpose: To determine whether patient characteristics, concomitant injuries, and graft choice during ACL reconstruction can predict which patients achieve acceptable knee function 1 year after reconstruction. Study Design: Case-control study; Level of evidence, 3...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29775379/decision-to-return-to-sport-participation-after-anterior-cruciate-ligament-reconstruction-part-ii-self-reported-and-functional-performance-outcomes
#4
Jennifer L Werner, Julie P Burland, Carl G Mattacola, Jenny Toonstra, Robert A English, Jennifer S Howard
CONTEXT:   Anterior cruciate ligament (ACL) reconstruction (ACLR) is the most commonly used method for helping athletes regain function and return to preinjury activity levels after ACL injury. Outcomes after ACLR have suggested that athletes return to a level of function that would support a return to sport participation; however, in a recent meta-analysis, pooled return rates were only 55%. It is unclear whether this discrepancy is a result of functional impairments. OBJECTIVE:   To compare patient-reported outcomes (PROs), dynamic balance, dynamic functional performance, strength, and muscular endurance in athletes who have returned to sport (RTS) and athletes who have not returned to sport (NRTS) after ACLR...
May 18, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29772188/hamstring-and-ankle-flexibility-deficits-are-weak-risk-factors-for-hamstring-injury-in-professional-soccer-players-a-prospective-cohort-study-of-438-players-including-78-injuries
#5
Nicol van Dyk, Abdulaziz Farooq, Roald Bahr, Erik Witvrouw
BACKGROUND: Hamstring injuries remain a significant injury burden in sports such as soccer that involve high-speed running. It has repeatedly been identified as the most common noncontact injury in elite male soccer, representing 12% of all injuries. As the incidence of hamstring injuries remains high, investigations are aimed at better understanding how to prevent hamstring injuries. Stretching to improve flexibility is commonly used in elite-level sports, but risk factor studies have reported contradicting results, leading to unclear conclusions regarding flexibility as a risk factor for hamstring injuries...
May 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29752059/risk-factors-for-abnormal-anteroposterior-knee-laxity-after-primary-anterior-cruciate-ligament-reconstruction
#6
Riccardo Cristiani, Magnus Forssblad, Björn Engström, Gunnar Edman, Anders Stålman
PURPOSE: To identify preoperative and intraoperative factors associated with abnormal anterior knee laxity after primary anterior cruciate ligament (ACL) reconstruction. METHODS: A total of 5,462 patients who underwent primary ACL reconstruction at our institution from January 2000 to October 2015, with no associated ligament injuries, were included. Demographic data, information regarding graft used, concomitant meniscal surgery, and instrumented laxity were reviewed...
May 8, 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29749751/visual-motor-control-of-drop-landing-after-anterior-cruciate-ligament-reconstruction
#7
Dustin R Grooms, Ajit Chaudhari, Stephen J Page, Deborah S Nichols-Larsen, James A Onate
CONTEXT:   Visual feedback is crucial in the control of human movement. When vision is obstructed, alterations in landing neuromuscular control may increase movements that place individuals at risk for injury. Anterior cruciate ligament (ACL) injury may further alter the motor-control response to alterations in visual feedback. The development of stroboscopic glasses that disrupt visual feedback without fully obscuring it has enabled researchers to assess visual-motor control during movements that simulate the dynamic demands of athletic activity...
May 11, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29740557/hip-and-trunk-muscles-activity-during-nordic-hamstring-exercise
#8
Shideh Narouei, Atsushi Imai, Hiroshi Akuzawa, Kiyotaka Hasebe, Koji Kaneoka
The nordic hamstring exercise (NHE) is a dynamic lengthening hamstring exercise that requires trunk and hip muscles activation. Thigh muscles activation, specifically hamstring/quadriceps contractions has been previously examined during NHE. Trunk and hip muscles activity have not been enough studied. The aim of this study was to analyze of hip and trunk muscles activity during NHE. Surface electromyography (EMG) and kinematic data were collected during NHE. Ten healthy men with the age range of 21-36 years performed two sets of two repetitions with downward and upward motions each of NHE...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29739304/soccer-injury-movement-screen-sims-composite-score-is-not-associated-with-injury-among-semi-professional-soccer-players
#9
Robert McCunn, Karen Aus der Fünten, Matthew Whalan, John A Sampson, Tim Meyer
Study Design Prospective cohort. Background The association between movement quality and injury is equivocal. No soccer-specific movement assessment has been prospectively investigated in relation to injury risk. Objectives To investigate the association between a soccer-specific movement quality assessment and injury risk among semi-professional soccer players. Methods Semi-professional soccer players (n=306) from 12 clubs completed the Soccer Injury Movement Screen (SIMS) during the pre-season period. Individual training/match exposure and non-contact time loss injuries were recorded prospectively for the entirety of the 2016 season...
May 8, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29706723/electromyographic-activity-of-selected-trunk-core-and-thigh-muscles-in-commonly-used-exercises-for-acl-rehabilitation
#10
Omid A Khaiyat, Jessica Norris
[Purpose] Most of rehabilitation programmes for Anterior Cruciate Ligament (ACL) injury focus on quadriceps-hamstrings activation imbalances and less is known about kinetically linked muscles. This study investigated electromyographic activity of selected trunk, core, and thigh muscles during common rehabilitation exercises for ACL injury. [Subjects and Methods] Twelve active female volunteers participated in this cross-sectional laboratory study. Surface EMG was used to compare activation of eight trunk, hip/core, and lower limb muscles: Erector Spinae (ES), Rectus Abdominis (RA), Gluteus Maximus (GM), Vastus Lateralis (VL), Rectus Femoris (RF), Vastus Medialis (VM), Biceps Femoris (BF), and Semitendinosus (ST) during Forward Lunge, Double Leg Raise, Glute Bridge, Sit-Up, and Squat...
April 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29694677/interseason-variability-in-isokinetic-strength-and-poor-correlation-with-nordic-hamstring-eccentric-strength-in-football-players
#11
Nicol van Dyk, Erik Witvrouw, Roald Bahr
INTRODUCTION: In elite sport, the use of strength testing to establish muscle function and performance is common. Traditionally, isokinetic strength tests have been used, measuring torque during concentric and eccentric muscle action. A device that measures eccentric hamstring muscle strength while performing the Nordic hamstring exercise is now also frequently used. The study aims to investigate the variability of isokinetic muscle strength over time, e.g. between seasons, and the relationship between isokinetic testing and the new Nordic hamstring exercise device...
April 25, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29685059/hamstring-muscle-use-in-females-during-hip-extension-and-the-nordic-hamstring-exercise-an-fmri-study
#12
Daniel J Messer, Matthew N Bourne, Morgan D Williams, Aiman Al Najjar, Anthony J Shield
Study Design Cross-sectional study. Background Understanding hamstring muscle activation patterns in resistance training exercises may have implications for the design of strength training and injury prevention programs. Unfortunately, surface electromyography studies have reported conflicting results with regard to hamstring muscle activation patterns in women. Objectives To determine the spatial patterns of hamstring muscle activity during the 45º hip-extension and Nordic hamstring exercises, in females using functional magnetic resonance imaging...
April 23, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29672351/femoral-artery-blood-flow-and-microcirculatory-perfusion-during-acute-low-level-functional-electrical-stimulation-in-spinal-cord-injury
#13
Thomas J Barton, David A Low, Thomas W J Janssen, Maurits Sloots, Christof A J Smit, Dick H J Thijssen
OBJECTIVE: Functional electrical stimulation (FES) may help to reduce the risk of developing macro- and microvascular complications in people with SCI. Low-intensity FES has significant clinical potential since this can be applied continuously throughout the day. This study examines the acute effects of low intensity FES using wearable clothing garment on vascular blood flow and oxygen consumption in people with SCI. DESIGN: Cross-sectional observation study METHODS: Eight participants with a motor complete SCI received 4x3 minutes of unilateral FES to the gluteal and hamstring muscles...
April 19, 2018: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29671490/common-running-injuries-evaluation-and-management
#14
Michael J Arnold, Aaron L Moody
Running is a common form of exercise but predisposes athletes to several running-related injuries. Most running injuries are due to overuse and respond to conservative treatment. Tendinopathies in the patellar, Achilles, and hamstring tendons are common, and are primarily treated with eccentric exercise. Iliotibial band syndrome and patellofemoral pain syndrome are less common than patellar tendinopathy and are treated by strengthening exercises for the core and legs in addition to flexibility exercises. Acute hamstring strains and medial tibial stress syndrome require a period of relative rest, followed by stretching and graded return to activity...
April 15, 2018: American Family Physician
https://www.readbyqxmd.com/read/29665604/-foreign-material-free-anterior-cruciate-ligament-repair-with-hamstring-graft-felmet-technique
#15
Marc Chmielnicki, Wolfram Siebert, Axel Prokop
Rupture of the anterior cruciate ligament (ACL) is a common sports injury. Shear forces can damage the articular cartilage and lead to early osteoarthritis. Ligamentary stabilisation of the knee is necessary. Today, arthroscopic ACL repair is a standard knee procedure. Transplant fixation is often performed using implants, e.g. interference screws. The foreign material-free procedure using the Felmet technique enables biological, mechanically stable fixation of the hamstring tendon graft. We demonstrate the surgical technique, including meniscus suture and a video case study...
April 2018: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29658521/ratios-of-torques-of-antagonist-muscle-groups-in-female-soccer-players
#16
Artur Struzik, Adam Siemieński, Tadeusz Bober, Bogdan Pietraszewski
PURPOSE: An increase in the value of the hamstring-to-quadriceps (H/Q) ratio with an increase in angular velocity may effectively prevent injuries of the back of the thigh. Previous studies have found that the conventional H/Q ratio was unaltered along with an increasing angular velocity in females. Therefore, this study aimed to investigate the relationships between the conventional H/Q ratio and angular velocity in a group of female soccer players. METHODS: The study was carried out on a group of 16 female soccer players (age: 20...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29655857/the-sequence-of-prevention-for-musculoskeletal-injuries-among-adult-recreational-footballers-a-systematic-review-of-the-scientific-literature
#17
REVIEW
Ozgur Kilic, Ellen Kemler, Vincent Gouttebarge
OBJECTIVE: To gather epidemiological information related to all steps of Van Mechelen's "sequence of prevention" for musculoskeletal injuries among adult recreational football players. METHODS: A systematic review of the scientific literature was conducted in Medline via Pubmed. Therefore, two highly sensitive search strategies based on three groups of keywords (and related search terms) were used. RESULTS: In total, 33 relevant original studies were included in our systematic review...
February 2, 2018: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29650521/infographic-the-effect-of-high-speed-running-on-hamstring-strain-injury-risk
#18
Steven John Duhig, Anthony J Shield, David Opar, Tim J Gabbett, Cameron Ferguson, Morgan Williams
No abstract text is available yet for this article.
April 12, 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29650337/knee-flexion-not-hip-extension-strength-is-persistently-reduced-following-hamstring-strain-injury-in-australian-football-athletes-implications-for-periodic-health-examinations
#19
Paula C Charlton, Benjamin Raysmith, Martin Wollin, Simon Rice, Craig Purdam, Ross A Clark, Michael K Drew
OBJECTIVES: Determine whether clinically feasible tests of isometric lower limb strength and range of motion (ROM) in Australian Football (AF) athletes are useful in Periodic Health Examinations to identify persistent deficits following hamstring strain injury (HSI). DESIGN: Case-control. METHODS: Thirty-seven male, semi-professional AF athletes (mean±SD; age, 20.2±2.9years; height, 1.7±0.5m; mass, 81±9.2kg) participated, ten athletes (37%) reported HSI within the previous three seasons of competition...
April 3, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29629813/summative-report-on-time-out-of-play-for-major-and-minor-league-baseball-an-analysis-of-49-955-injuries-from-2011-through-2016
#20
Christopher L Camp, Joshua S Dines, Jelle P van der List, Stan Conte, Justin Conway, David W Altchek, Struan H Coleman, Andrew D Pearle
BACKGROUND: Recent epidemiologic reports have demonstrated rising injury rates in Major League Baseball (MLB) and Minor League Baseball (MiLB). Although several studies have recently been published on specific injuries, the majority of injuries have not yet been formally studied. PURPOSE: The purpose of this study is to (1) generate a summative analysis of all injuries that occur in MLB and MiLB, (2) identify the 50 most common injuries, and (3) generate focused reports and fact sheets on the characteristics of each of those diagnoses...
April 1, 2018: American Journal of Sports Medicine
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