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Injury of high strain rate

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https://www.readbyqxmd.com/read/29737221/injuries-in-karate-systematic-review
#1
Roger E Thomas, Jodie Ornstein
OBJECTIVES: to identify all studies of Karate injuries and assess injury rates, types, location, and causes. METHODS: Six electronic and four grey literature databases were searched. Two reviewers independently assessed titles/abstracts, abstracted data and assessed risk-of-bias with the Newcastle-Ottawa scale. Average injury rates/1000AE (AE = athletic-encounter) and/1000minutesAE, injury location and type weighted by study size were calculated. RESULTS: In competitions rates of injury/1000AE and/1000 minutesAE were similar for males (111...
May 8, 2018: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29729417/compressive-mechanical-characterization-of-non-human-primate-spinal-cord-white-matter
#2
Shervin Jannesar, Mark Allen, Sarah Mills, Anne Gibbons, Jacqueline C Bresnahan, Ernesto A Salegio, Carolyn J Sparrey
The goal of developing computational models of spinal cord injury (SCI) is to better understand the human injury condition. However, finite element models of human SCI have used rodent spinal cord tissue properties due to a lack of experimental data. Central nervous system tissues in non human primates (NHP) closely resemble that of humans and therefore, it is expected that material constitutive models obtained from NHPs will increase the fidelity and the accuracy of human SCI models. Human SCI most often results from compressive loading and spinal cord white matter properties affect FE predicted patterns of injury; therefore, the objectives of this study were to characterize the unconfined compressive response of NHP spinal cord white matter and present an experimentally derived, finite element tractable constitutive model for the tissue...
May 2, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29726698/on-the-use-of-wearable-physiological-monitors-to-assess-heat-strain-during-occupational-heat-stress
#3
Sean R Notley, Andreas D Flouris, Glen P Kenny
Workers in many industries are required to perform arduous work in high heat stress conditions, which can lead to rapid increases in body temperature that elevate the risk of heat-related illness or even death. Traditionally, effort to mitigate work-related heat injury has been directed to the assessment of environmental heat stress (e.g., wet-bulb globe temperature), rather than the associated physiological strain responses (e.g., heart rate, skin and core temperatures). However, since a workers physiological response to a given heat stress is modified independently by inter-individual factors (e...
May 4, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29690741/-antiseptic-effect-of-compound-lysostaphin-disinfectant-and-its-preventive-effect-on-infection-of-artificial-dermis-after-graft-on-full-thickness-skin-defect-wound-in-rats
#4
J Jin, H Zhou, Z C Cui, L Wang, P F Luo, S Z Ji, X Y Hu, B Ma, G Y Wang, S H Zhu, Z F Xia
Objective: To study the antiseptic effect of compound lysostaphin disinfectant and its preventive effect on infection of artificial dermis after graft on full-thickness skin defect wound in rats. Methods: (1) Each one standard strain of Klebsiella pneumoniae, Acinetobacter baumannii, and Staphylococcus aureus were selected. Each 20 clinical strains of Klebsiella pneumoniae, Acinetobacter baumannii, and Staphylococcus aureus were collected from those isolated from wound exudates of burn patients hospitalized in our wards from January 2014 to December 2016 according to the random number table...
April 20, 2018: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/29672952/remodeling-of-muscle-fibres-approaching-the-human-myotendinous-junction
#5
Jens R Jakobsen, Niels R Jakobsen, Abigail L Mackey, Manuel Koch, Michael Kjaer, Michael R Krogsgaard
INTRODUCTION: The myotendinous junction (MTJ) is at high risk of strain injuries, due to high amounts of energy that is transferred through this structure. The risk of strain injury is significantly reduced by heavy resistance training (HRT), indicating a remodeling capacity of MTJ. We investigated the degree of remodeling of muscle fibres near the human MTJ. METHODS: In eight individuals, samples were taken from the semitendinosus and gracilis MTJ and they were stained immunohistochemically for myonuclei (DAPI), fibroblasts (TCF7L2) and satellite cells (CD56)...
April 19, 2018: Scandinavian Journal of Medicine & Science in Sports
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
#6
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
https://www.readbyqxmd.com/read/29560495/material-properties-of-rat-middle-cerebral-arteries-at-high-strain-rates
#7
E David Bell, Matthew Converse, Haojie Mao, Ginu Unnikrishnan, Jaques Reifman, Kenneth L Monson
Traumatic brain injury (TBI), resulting from either impact- or non-impact blast-related mechanisms, is a devastating cause of death and disability. The cerebral blood vessels, which provide critical support for brain tissue in both health and disease, are commonly injured in TBI. However, little is known about how vessels respond to traumatic loading, particularly at rates relevant to blast. To better understand vessel responses to trauma, the objective of this project was to characterize the high-rate response of passive cerebral arteries...
March 19, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29521705/chest-trauma-in-athletic-medicine
#8
Nicholas R Phillips, Derek E Kunz
While overall sports participation continues at high rates, chest injuries occur relatively infrequently. Many conditions of chest injury are benign, related to simple contusions and strains, but the more rare, severe injuries carry a much higher risk of morbidity and mortality than the typical issues encountered in athletic medicine. Missed or delayed diagnosis can prove to be catastrophic. Sports medicine providers must be prepared to encounter a wide range of traumatic conditions relating to the torso, varying from the benign chest wall contusion to the life-threatening tension pneumothorax...
March 2018: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/29484899/lnjuries-in-wrestling-systematic-review
#9
Roger E Thomas, Kamran Zamanpour
OBJECTIVES: To identify all studies of injuries in wrestling, assess risk of bias and compute weighted average injury rates. METHODS: 17 online databases and nine grey literature resources were searched with no language/date limitations. Abstracts were assessed for inclusion and data abstracted independently by two reviewers. RESULTS: Eleven studies of competitions, 27 databases, four surveys (699 wrestlers) and seventeen case reports (604 cases) were included...
March 9, 2018: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29470745/estimated-brain-tissue-response-following-impacts-associated-with-and-without-diagnosed-concussion
#10
Jonathan G Beckwith, Wei Zhao, Songbai Ji, Amaris G Ajamil, Richard P Bolander, Jeffrey J Chu, Thomas W McAllister, Joseph J Crisco, Stefan M Duma, Steven Rowson, Steven P Broglio, Kevin M Guskiewicz, Jason P Mihalik, Scott Anderson, Brock Schnebel, P Gunnar Brolinson, Michael W Collins, Richard M Greenwald
Kinematic measurements of head impacts are sensitive to sports concussion, but not highly specific. One potential reason is these measures reflect input conditions only and may have varying degrees of correlation to regional brain tissue deformation. In this study, previously reported head impact data recorded in the field from high school and collegiate football players were analyzed using two finite element head models (FEHM). Forty-five impacts associated with immediately diagnosed concussion were simulated along with 532 control impacts without identified concussion obtained from the same players...
June 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29453025/material-properties-of-the-brain-in-injury-relevant-conditions-experiments-and-computational-modeling
#11
Wei Zhao, Bryan Choate, Songbai Ji
Material properties of the brain have been extensively studied but remain poorly characterized. The vast variations in constitutive models and material constants are well documented. However, no study exists to translate the variations into disparities in impact-induced brain strains most relevant to brain injury. Here, we reviewed a subset of injury-relevant brain material properties either characterized in experiments or adopted in recent head injury models. To highlight how variations in measured brain material properties manifested in simulated brain strains, we selected six experiments that have provided a complete set of brain material model and constants to implement a common head injury model...
April 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29387654/time-to-recovery-of-sciatic-function-index-after-induced-tibialis-anterior-strain-in-rats
#12
Tasneem Mohammad, Aliaa Rehan Youssef
Background: Muscle strain is a common injury with a high recurrence rate. Due to the heterogeneity of strain injuries, experimental animals provide controlled and reproducible models to investigate such injuries. Sciatic Function Index (SFI) is a clinically feasible method to assess hind limb recovery in rodents after induced injuries. Objectives: To investigate time to recovery of SFI after induced-strain in tibialis anterior (TA) muscle in rats. Methods: Sixteen adult male Wister rats were randomly and equally divided to a normal control group that received no intervention, and TA induced muscle strain group...
July 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/29387647/orthopaedics-injuries-in-male-professional-football-players-in-brazil-a-prospective-comparison-between-two-divisions
#13
Gustavo Gonçalves Arliani, Paulo Henrique Schmidt Lara, Diego Costa Astur, André Pedrinelli, Jorge Roberto Pagura, Moisés Cohen
Background: Football is a high-speed contact sport and the risk of injury is high. The objective of this study was to compare the two main divisions (A1 and A2) of the São Paulo Football Championship and to perform a correlation analysis of the variables studied. Methods: A prospective study was conducted using an electronic questionnaire previously developed by the Medical Committee of the São Paulo Football Federation. The questionnaire was sent to the doctors of the teams playing in the A1 and A2 divisions of the São Paulo Football Championship after each round...
July 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/29297365/regional-physiology-of-ards
#14
REVIEW
Luciano Gattinoni, Tommaso Tonetti, Michael Quintel
The acute respiratory distress (ARDS) lung is usually characterized by a high degree of inhomogeneity. Indeed, the same lung may show a wide spectrum of aeration alterations, ranging from completely gasless regions, up to hyperinflated areas. This inhomogeneity is normally caused by the presence of lung edema and/or anatomical variations, and is deeply influenced by the gravitational forces.For any given airway pressure generated by the ventilator, the pressure acting directly on the lung (i.e., the transpulmonary pressure or lung stress) is determined by two main factors: 1) the ratio between lung elastance and the total elastance of the respiratory system (which has been shown to vary widely in ARDS patients, between 0...
December 28, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29286474/mouse-model-for-pancreas-transplantation-using-a-modified-cuff-technique
#15
Benno Cardini, Rupert Oberhuber, Sven R Hein, Rebecca Eiter, Martin Hermann, Markus Kofler, Stefan Schneeberger, Gerald Brandacher, Manuel Maglione
Mouse models have several advantages in transplantation research, including easy handling, a variety of genetically well-defined strains, and the availability of the widest range of molecular probes and reagents to perform in vivo as well as in vitro studies. Based on our experience with various murine transplantation models, we developed a heterotopic pancreas transplantation model in mice with the intent to analyze mechanisms underlying severe ischemia reperfusion injury-associated early graft damage. In contrast to previously described techniques using suture techniques, herein we describe a new procedure using a non-suture cuff technique...
December 16, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29230501/-development-of-ground-based-physician-staffed-emergency-missions-in-the-city-of-leipzig-from-2003-to-2013
#16
K Bader, M Bernhard, A Gries, M Kaul, R Schröder, A Ramshorn-Zimmer
BACKGROUND: The annual number of physician-based emergency missions reported is continuously increasing. Data from large cities concerning this development over long periods is sparse. MATERIAL AND METHODS: In this retrospective study the charts of all ground-based physician-staffed emergency missions in the city of Leipzig for the first quarters of 2003 and 2013 were analyzed. Patient characteristics, injury and illness severities, mission location, hospital admission rate, as well as emergency interventions were collated...
March 2018: Der Anaesthesist
https://www.readbyqxmd.com/read/29229143/myocardial-functional-changes-in-transfemoral-versus-transapical-aortic-valve-replacement
#17
COMPARATIVE STUDY
Niraj Asthana, Aditya Mantha, Eric H Yang, William Suh, Olcay Aksoy, Richard J Shemin, Gabriel Vorobiof, Peyman Benharash
BACKGROUND: Transcatheter aortic valve replacement (TAVR) has greatly expanded the treatment options available for patients with severe aortic stenosis at high surgical risk. MATERIALS AND METHODS: We compared changes in myocardial function in TAVR with a transfemoral (TF) versus a transapical (TA) approach at a major tertiary hospital from 2012-2016. Traditional echocardiographic measures of cardiac structure and function were tracked, alongside the use of two-dimensional speckle tracking echocardiography to measure myocardial strain and strain rates...
January 2018: Journal of Surgical Research
https://www.readbyqxmd.com/read/29202784/sprint-and-jump-performance-in-elite-male-soccer-players-following-a-10-week-nordic-hamstring-exercise-protocol-a-randomised-pilot-study
#18
K Krommes, J Petersen, M B Nielsen, P Aagaard, P Hölmich, K Thorborg
OBJECTIVE: The preseason Nordic Hamstring Protocol (NHP) reduces hamstring strain injuries in football players. Despite persisting injury rates, elite clubs are reluctant to apply the NHP often over concerns of negative impacts on performance. This pilot study investigated if sprint or jump-performance outcomes tended to increase or decrease following implementation of the NHP in elite male soccer-players. RESULTS: Nineteen male soccer players from the Danish 1st division were randomised to perform NHP (27 sessions) during pre-season, or to control group (CG)...
December 4, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29172124/material-mapping-strategy-to-improve-the-predicted-response-of-the-proximal-femur-to-a-sideways-fall-impact
#19
W S Enns-Bray, H Bahaloo, I Fleps, O Ariza, S Gilchrist, R Widmer, P Guy, H Pálsson, S J Ferguson, P A Cripton, B Helgason
Sideways falls are largely responsible for the highly prevalent osteoporotic hip fractures in today's society. These injuries are dynamic events, therefore dynamic FE models validated with dynamic ex vivo experiments provide a more realistic simulation than simple quasi-static analysis. Drop tower experiments using cadaveric specimens were used to identify the material mapping strategy that provided the most realistic mechanical response under impact loading. The present study tested the addition of compression-tension asymmetry, tensile bone damage, and cortical-specific strain rate dependency to the material mapping strategy of fifteen dynamic FE models of the proximal femur, and found improved correlations and reduced error for whole bone stiffness (R2 = 0...
February 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29169199/-internet-addiction-suicidality-and-non-suicidal-self-harming-behavior-a-systematic-review
#20
Toni Andreas Steinbüchel, Stephan Herpertz, Ina Külpmann, Aram Kehyayan, Jan Dieris-Hirche, Bert Theodor Te Wildt
Background Internet addiction (IA) is associated with a high rate of co-morbid mental disorders, especially depression, anxiety disorders, ADHD and personality disorders and a considerable level of psychological strain. In terms of risk assessment, the present work investigates the current research literature on suicidal behavior and non-suicidal self-injurious behavior (NSSI). Methods We performed a systematic literature search in 14 databases on title and abstract level for the most common keywords for IA, NSSI and suicidality...
November 23, 2017: Psychotherapie, Psychosomatik, Medizinische Psychologie
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