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https://www.readbyqxmd.com/read/29446708/does-local-dynamic-stability-of-kayak-paddling-technique-affect-the-sports-performance-a-pilot-study
#1
Daniel Hamacher, Tobias Krebs, Guido Meyer, Astrid Zech
During competition, kayak athletes must optimally adapt to environmental factors (e.g. wind, waves) to achieve peak performance. However, the ability to adapt to such perturbations has never been assessed in kayak paddling. Therefore, the aim of the current study was to evaluate the local dynamic stability in sports technique of youth sprint kayak athletes. In a cross-sectional study, 14 healthy male athletes were recruited from an elite youth sprint kayak squad. During an incremental kayak ergometer test, mean power, heart rates and local dynamic technique stability of hands, arms, trunk and paddle were registered and the association with the athletes 2000 m free-water times were estimated using mixed models...
February 15, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29444266/fundamentals-of-glycogen-metabolism-for-coaches-and-athletes
#2
Bob Murray, Christine Rosenbloom
The ability of athletes to train day after day depends in large part on adequate restoration of muscle glycogen stores, a process that requires the consumption of sufficient dietary carbohydrates and ample time. Providing effective guidance to athletes and others wishing to enhance training adaptations and improve performance requires an understanding of the normal variations in muscle glycogen content in response to training and diet; the time required for adequate restoration of glycogen stores; the influence of the amount, type, and timing of carbohydrate intake on glycogen resynthesis; and the impact of other nutrients on glycogenesis...
February 10, 2018: Nutrition Reviews
https://www.readbyqxmd.com/read/29431592/in-season-changes-in-ventricular-morphology-and-systolic-function-in-adolescent-female-athletes
#3
Andrew M Watson, Carol Coutinho, Kristin Haraldsdottir, Stacey Brickson, Warren Dunn, Marlowe Eldridge
PURPOSE: To evaluate the influence of physical maturity on the changes in ventricular morphology and function with sport training in female youth athletes. METHODS: Thirty-two female athletes (age 13-18 years) underwent height and weight measurement and 2-D echocardiographic evaluation immediately prior to, and following, a 20-week soccer season. Pre- and post-season left ventricular end-diastolic diameter (LVEDD), end-diastolic volume (LVEDV), ejection fraction (LVEF), stroke volume (LVSV), mass (LVM), and posterior wall thickness (LVPWT), right ventricular end-diastolic diameter (RVEDD), end-diastolic area (RVEDA), and fractional area change (RVFAC), and interventricular septal thickness (IVST) were compared...
February 12, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29420806/a-history-of-shoulder-instability-in-the-military-where-we-have-been-and-what-we-have-learned
#4
Jared A Wolfe, Daniel L Christensen, Timothy C Mauntel, Brett D Owens, Lance E LeClere, Jonathan F Dickens
Introduction: Shoulder instability is one of the most common pathologies seen by the orthopedic sports medicine surgeon. With a uniquely young, high-demand patient population in the U.S. Military, the incidence of shoulder instability is remarkably more common than the civilian population. As such, military orthopedic surgeons and sports medicine and shoulder specialists have developed a unique understanding and experience of shoulder instability. The historical advances of shoulder instability in the military have been instrumental in understanding the epidemiology, evaluation, pathology, treatment of first-time shoulder subluxations and dislocations, operative and non-operative treatment options, arthroscopic and open stabilization methods, management of the in-season athlete, treatment of combined and circumferential labral pathology, and associated pathology...
February 6, 2018: Military Medicine
https://www.readbyqxmd.com/read/29420150/adaptations-in-muscle-oxidative-capacity-fiber-size-and-oxygen-supply-capacity-after-repeated-sprint-training-in-hypoxia-combined-with-chronic-hypoxic-exposure
#5
Stephan van der Zwaard, Franck Brocherie, Bengt L G Kom, Grégoire P Millet, Louise Deldicque, Willem J van der Laarse, Olivier Girard, Richard T Jaspers
In this study, we investigate adaptations in muscle oxidative capacity, fiber size and oxygen supply capacity in team-sport athletes after six repeated-sprint sessions in normobaric hypoxia or normoxia combined with 14 days of chronic normobaric hypoxic exposure. Lowland elite field hockey players resided at simulated altitude ({greater than or equal to}14 h∙d-1 at 2800-3000 m) and performed regular training plus six repeated-sprint sessions in normobaric hypoxia (3000 m; LHTLH; n=6) or normoxia (0 m, LHTL; n=6) or lived at sea level with regular training only (LLTL; n=6)...
February 8, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29417874/adaptive-working-memory-training-reduces-the-negative-impact-of-anxiety-on-competitive-motor-performance
#6
Emmanuel Ducrocq, Mark Wilson, Tim J Smith, Nazanin Derakshan
Optimum levels of attentional control are essential to prevent athletes from experiencing performance breakdowns under pressure. The current study explored whether training attentional control using the adaptive dual n-back paradigm, designed to directly target processing efficiency of the main executive functions of working memory (WM), would result in transferrable effects on sports performance outcomes. A total of 30 tennis players were allocated to an adaptive WM training or active control group and underwent 10 days of training...
February 8, 2018: Journal of Sport & Exercise Psychology
https://www.readbyqxmd.com/read/29413645/the-role-of-cardiovascular-magnetic-resonance-imaging-in-the-assessment-of-highly%C3%A2-trained-athletes
#7
REVIEW
Sabiha Gati, Sanjay Sharma, Dudley Pennell
Exercise-associated benefits on the cardiovascular systems are well established. Although exercise-associated sudden cardiac death is rare, most deaths in young athletes are due to hereditary or congenital cardiac diseases. Athletic adaptation itself is associated with several structural changes that overlap those observed in individuals with cardiomyopathies, often leading to dilemmas for the clinician regarding life-changing decisions including advice against competitive sports participation. Cardiac magnetic resonance plays an increasingly important role in helping to establish an accurate diagnosis in these individuals...
February 2018: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29412694/lateral-ankle-sprain-in-a-mouse-model-lifelong-sensorimotor-dysfunction
#8
Erik A Wikstrom, Tricia Hubbard-Turner, Sophie Guderian, Michael J Turner
CONTEXT:   Ankle sprains are the most common orthopaedic injury that occurs during sport and physical activity. Many individuals who sprain their ankles develop chronic ankle instability (CAI), a condition characterized by recurrent injury, decreased physical activity, and decreased quality of life. These residual impairments are believed to persist for the remainder of the patient's life, in part due to the link between CAI and posttraumatic ankle osteoarthritis. However, this belief remains speculative due to the lack of long-term prospective investigations...
February 7, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29411251/the-impact-of-a-cultural-lifestyle-intervention-on-metabolic-parameters-after-gestational-diabetes-mellitus-a-randomized-controlled-trial
#9
Dana Zilberman-Kravits, Naomi Meyerstein, Yones Abu-Rabia, Arnon Wiznitzer, Ilana Harman-Boehm
OBJECTIVES: The prevalence of type 2 diabetes in Israel is increasing in all ethnic groups but most markedly in the Bedouin population. We aimed to assess the effects of a lifestyle change intervention on risk markers for type 2 diabetes after gestational diabetes mellitus (GDM). METHODS: One hundred eighty Jewish and Bedouin post-GDM women were randomly assigned to a lifestyle intervention group (IG) or a control group (CG) starting 3-4 months after delivery. The IG participated in healthy lifestyle sessions led by a dietician and a sports instructor for 24 months after delivery...
February 6, 2018: Maternal and Child Health Journal
https://www.readbyqxmd.com/read/29409092/-gallop-in-the-routineergometrie-only-chore-or-diagnostic-challenge
#10
Stephan Knöchner, K Kronberg, U Schumann
ANAMNESIS:  A 47-year-old recreational sportsman showed in a routine ergometry polymorphic ventricular extrasystoles with good physical performance. INVESTIGATIONS:  In resting ECG impressed ventricular extrasystoles (VES) predominantly right-hand-block-like with superior axis, a long-term ECG yielded up to 100 VES per hour. Echocardiographically imposing 4 - 5 trabeculae, feathered, reticular structures apically in the left and lower in the right ventricle...
February 2018: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/29404654/translation-and-validation-of-the-simplified-chinese-version-of-the-anterior-cruciate-ligament-return-to-sport-after-injury-acl-rsi
#11
Zhen-Yu Jia, Jin Cui, Wei Wang, Chen-Chen Xue, Tian-Ze Liu, Xuan Huang, Wei-Dong Xu
PURPOSE: The aim of this study is to obtain a translation and adaptation of the anterior cruciate ligament-return to sport after injury (ACL-RSI) into simplified Chinese and validate the simplified Chinese version. METHODS: Translation and adaptation were performed according to the guidelines of the American Academy of Orthopaedic Surgeons Outcome Committee. A total of 122 patients who were diagnosed with an ACL injury and underwent primary arthroscopic anterior cruciate ligament reconstruction (ACLR) between 2015 and 2016 were included in this study...
February 5, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29403318/cauliflower-ear-a-minimally-invasive-treatment-method-in-a-wrestling-athlete-a-case-report
#12
Josef Haik, Or Givol, Rachel Kornhaber, Michelle Cleary, Hagit Ofir, Moti Harats
Acute auricular hematoma can be caused by direct blunt trauma or other injury to the external ear. It is typically seen in those who practice full contact sports such as boxing, wrestling, and rugby. "Cauliflower ear" deformity, fibrocartilage formation during scarring, is a common complication of auricular hematomas. Therefore, acute drainage of the hematoma and postprocedural techniques for preventing recurrence are necessary for preventing the deformity. There are many techniques although no superior method of treatment has been found...
2018: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/29394252/tau-accumulations-in-the-brains-of-woodpeckers
#13
George Farah, Donald Siwek, Peter Cummings
Woodpeckers experience forces up to 1200-1400 g while pecking. It is assumed due to evolutionary adaptations, the woodpecker is immune to brain injury. This assumption has led to the use of the woodpecker as a model in the development of sports safety equipment such as football helmets. However, it is unknown at this time if the woodpecker brain develops neuro-trauma in relation to the high g-forces experienced during pecking. The brains of 10 ethanol preserved woodpeckers and 5 ethanol preserved red-winged black bird experimental controls were examined using Gallyas silver stain and anti-phospho-tau...
2018: PloS One
https://www.readbyqxmd.com/read/29393546/comparison-of-metabolic-adaptations-between-endurance-and-sprint-trained-athletes-after-an-exhaustive-exercise-in-two-different-calf-muscles-using-a-multi-slice-31-p-mr-spectroscopic-sequence
#14
Kevin Moll, Alexander Gussew, Maria Nisser, Steffen Derlien, Martin Krämer, Jürgen R Reichenbach
Measurements of exercise-induced metabolic changes, such as oxygen consumption, carbon dioxide exhalation or lactate concentration, are important indicators for assessing the current performance level of athletes in training science. With exercise-limiting metabolic processes occurring in loaded muscles, 31 P-MRS represents a particularly powerful modality to identify and analyze corresponding training-induced alterations. Against this background, the current study aimed to analyze metabolic adaptations after an exhaustive exercise in two calf muscles (m...
February 2, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29381423/glenohumeral-internal-rotation-deficit-and-risk-of-upper-extremity-injury-in-overhead-athletes-a-meta-analysis-and-systematic-review
#15
Robert A Keller, Anthony F De Giacomo, Julie A Neumann, Orr Limpisvasti, James E Tibone
CONTEXT: Current perception dictates that glenohumeral internal rotation deficit (GIRD) is a chronic adaptation that leads to an increased risk of pathologic conditions in the dominant shoulder or elbow of overhead athletes. OBJECTIVE: To determine whether adaptations in glenohumeral range of motion in overhead athletes lead to injuries of the upper extremity, specifically in the shoulder or elbow. DATA SOURCES: An electronic database search was performed using Medline, Embase, and SportDiscus from 1950 to 2016...
January 1, 2018: Sports Health
https://www.readbyqxmd.com/read/29377797/an-embedded-eight-channel-noise-canceling-wireless-wearable-semg-data-acquisition-system-with-adaptive-muscle-contraction-detection
#16
Mert Ergeneci, Kaan Gokcesu, Erhan Ertan, Panagiotis Kosmas
Wearable technology has gained increasing popularity in the applications of healthcare, sports science, and biomedical engineering in recent years. Because of its convenient nature, the wearable technology is particularly useful in the acquisition of the physiological signals. Specifically, the (surface electromyography) sEMG systems, which measure the muscle activation potentials, greatly benefit from this technology in both clinical and industrial applications. However, the current wearable sEMG systems have several drawbacks including inefficient noise cancellation, insufficient measurement quality, and difficult integration to customized applications...
February 2018: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/29372481/the-importance-of-muscular-strength-training-considerations
#17
REVIEW
Timothy J Suchomel, Sophia Nimphius, Christopher R Bellon, Michael H Stone
This review covers underlying physiological characteristics and training considerations that may affect muscular strength including improving maximal force expression and time-limited force expression. Strength is underpinned by a combination of morphological and neural factors including muscle cross-sectional area and architecture, musculotendinous stiffness, motor unit recruitment, rate coding, motor unit synchronization, and neuromuscular inhibition. Although single- and multi-targeted block periodization models may produce the greatest strength-power benefits, concepts within each model must be considered within the limitations of the sport, athletes, and schedules...
January 25, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29363481/adaptation-of-the-test-of-performance-strategies-competition-subscale-to-spanish
#18
David Tomé Lourido, Constantino Arce, Dolores Ponte
BACKGROUND: In recent years, there has been a growing interest in the conceptualisation and assessment of athletes’ psychological skills and the study of their impact on sports performance. The aim of this study was to adapt the Test of Performance Strategies 3 competition subscale to the Spanish context. METHOD: The items included in the original test in English were translated using a double-back method, and the test was completed by a sample of 1,003 Spanish athletes of both sexes...
February 2018: Psicothema
https://www.readbyqxmd.com/read/29359513/vascular-characteristics-in-young-women-effect-of-extensive-endurance-training-or-a-sedentary-life-style
#19
Niclas Bjarnegård, Toste Länne, Magnus Cinthio, Jan Ekstrand, Kristofer Hedman, Eva Nylander, Jan Henriksson
AIM: To explore whether high level endurance training in early age has an influence on the arterial wall properties in young women. METHODS: Forty-seven athletes (ATH) and 52 controls (CTR), all 17 to 25 years of age, were further divided into runners (RUN), whole-body endurance athletes (WBA), sedentary controls (SC) and normally active controls (AC). 2-D ultrasound scanning of the carotid arteries was performed to determine local common carotid artery (CCA) geometry and wall distensibility...
January 22, 2018: Acta Physiologica
https://www.readbyqxmd.com/read/29356641/shoulder-injuries-in-the-overhead-throwing-athlete-epidemiology-mechanisms-of-injury-and-imaging-findings
#20
Dana J Lin, Tony T Wong, Jonathan K Kazam
The unparalleled velocity achieved by overhead throwers subjects the shoulder to extreme forces, resulting in both adaptive changes and pathologic findings that can be detected at imaging. A key biomechanical principle of throwing is achieving maximum external rotation, which initially leads to adaptive changes that may result in a pathologic cascade of injuries. In addition to the well-established concepts of glenohumeral internal rotation deficit and internal impingement, osseous and soft-tissue injuries of the shoulder unique to overhead athletes are illustrated...
February 2018: Radiology
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