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https://www.readbyqxmd.com/read/28643550/hip-joint-kinetics-in-the-table-tennis-topspin-forehand-relationship-to-racket-velocity
#1
Yoichi Iino
The purpose of this study was to determine hip joint kinetics during a table tennis topspin forehand, and to investigate the relationship between the relevant kinematic and kinetic variables and the racket horizontal and vertical velocities at ball impact. Eighteen male advanced table tennis players hit cross-court topspin forehands against backspin balls. The hip joint torque and force components around the pelvis coordinate system were determined using inverse dynamics. Furthermore, the work done on the pelvis by these components was also determined...
June 23, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28638097/linking-the-rotation-of-a-rigid-body-to-the-schr%C3%A3-dinger-equation-the-quantum-tennis-racket-effect-and-beyond
#2
L Van Damme, D Leiner, P Mardešić, S J Glaser, D Sugny
The design of efficient and robust pulse sequences is a fundamental requirement in quantum control. Numerical methods can be used for this purpose, but with relatively little insight into the control mechanism. Here, we show that the free rotation of a classical rigid body plays a fundamental role in the control of two-level quantum systems by means of external electromagnetic pulses. For a state to state transfer, we derive a family of control fields depending upon two free parameters, which allow us to adjust the efficiency, the time and the robustness of the control process...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28632057/rotation-sequence-to-report-humerothoracic-kinematics-during-3d-motion-involving-large-horizontal-component-application-to-the-tennis-forehand-drive
#3
Thomas Creveaux, Violaine Sevrez, Raphaël Dumas, Laurence Chèze, Isabelle Rogowski
The aim of this study was to examine the respective aptitudes of three rotation sequences (YtXf'Yh'', ZtXf'Yh'', and XtZf'Yh'') to effectively describe the orientation of the humerus relative to the thorax during a movement involving a large horizontal abduction/adduction component: the tennis forehand drive. An optoelectronic system was used to record the movements of eight elite male players, each performing ten forehand drives. The occurrences of gimbal lock, phase angle discontinuity and incoherency in the time course of the three angles defining humerothoracic rotation were examined for each rotation sequence...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28620677/efficacy-of-peloid-therapy-in-patients-with-chronic-lateral-epicondylitis-a-randomized-controlled-single-blind-study
#4
Burcu Metin Ökmen, Rıza Eröksüz, Lale Altan, Meliha Kasapoğlu Aksoy
The aim of this study was to assess the effect of peloid on pain, functionality, daily life activities, and quality of life of lateral epicondylitis (LE) patients. In this randomized, controlled, single-blind study, 75 patients who were diagnosed with chronic LE were enrolled to the study. Patients were randomized into two groups using the random number table. The patients in the first group (group 1) (n = 33), were given lateral epicondylitis band (LEB) (during the day for 6 weeks) + peloid therapy (five consecutive days a week for 2 weeks), and the second group (group 2) (n = 32), received LEB treatment alone...
June 15, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28609253/relationship-of-tennis-play-to-executive-function-in-children-and-adolescents
#5
Toru Ishihara, Shigemi Sugasawa, Yusuke Matsuda, Masao Mizuno
This study evaluated the association between the frequency of tennis play and executive function in children and adolescents. One hundred and six junior tennis players (6-15 years old) participated in this study. Executive function, including inhibitory control, working memory, and cognitive flexibility were evaluated at rest. Females showed better inhibitory control and cognitive flexibility than males. In males, more frequent tennis play was associated with higher basic processing speed and inhibitory control after controlling for age, gender, body mass index (BMI), and tennis experience...
June 13, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28599798/determination-of-optimal-shoe-fitting-for-children-tennis-players-effects-of-inner-shoe-volume-and-upper-stiffness
#6
Alexis Herbaut, Maxime Roux, Nils Guéguen, Pascale Chavet, Franck Barbier, Emilie Simoneau-Buessinger
The purpose of this study was to determine the optimal inner-shoe volume for children tennis players. Sixteen participants, aged from 8 to 12 years old assessed comfort of 6 shoes, which were a combination of 3 lasts (thin, medium and wide) and 2 upper constructions (flexible and stiff), while a sock equipped with textile sensors was measuring the pressure applied on their foot. The thin last was based on the proportion of an adult last. The widest shoes produced the lowest pressure on the 1st and 5th metatarsal heads, the medial midfoot and the medial and lateral heel (p < 0...
June 6, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28598646/semiflexible-polymers-in-spherical-confinement-bipolar-orientational-order-versus-tennis-ball-states
#7
Arash Nikoubashman, Daniel A Vega, Kurt Binder, Andrey Milchev
Densely packed semiflexible polymers with contour length L confined in spheres with radius R of the same order as L cannot exhibit uniform nematic order. Depending on the chain stiffness (which we vary over a wide range), highly distorted structures form with topological defects on the sphere surface. These structures are completely different from previously observed ones of very long chains winding around the inner surface of spheres and from nematic droplets. At high densities, a thin shell of polymers close to the sphere surface exhibits a tennis ball texture due to the confinement-induced gradual bending of polymer bonds...
May 26, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28593098/reliability-and-validity-of-a-biomechanically-based-analysis-method-for-the-tennis-serve
#8
Natalie L Myers, W Ben Kibler, Leah Lamborn, Belinda J Smith, Tony English, Cale Jacobs, Tim L Uhl
BACKGROUND: An observational tennis serve analysis (OTSA) tool was developed using previously established body positions from three-dimensional kinematic motion analysis studies. These positions, defined as nodes, have been associated with efficient force production and minimal joint loading. However, the tool has yet to be examined scientifically. PURPOSE: The primary purpose of this investigation was to determine the inter-observer reliability for each node between two health care professionals (HCPs) that developed the OTSA, and secondarily to investigate the validity of the OTSA...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28588166/comparative-efficacy-of-local-steroid-and-therapeutic-ultrasound-for-quicker-functional-improvement-in-tennis-elbow
#9
M S Rahman, A K Salek, M A Ullah
Lateral epicondylitis or Tennis elbow is very common repetitive stress injury or cumulative trauma disorder among active professionals and tennis players. Local steroid injection can provide quick functional improvement as sought by most of the patients. Therapeutic ultrasound and eccentric exercises can also improve the function. This study was carried out to see the comparative efficacy of these two modalities of treatments in terms of quicker functional improvement and this randomized interventional clinical trial was carried out in a private rehabilitation hospital in Dhaka...
April 2017: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/28582628/energetic-demand-and-physical-conditioning-of-table-tennis-players-a-study-review
#10
Alessandro Moura Zagatto, Miran Kondric, Beat Knechtle, Pantelis Theo Nikolaidis, Billy Sperlich
Table tennis is a racket sport characterised by an intermittent movement profile, including short rallies interspersed with short breaks. In contrast to other racket sports, information is lacking regarding the: (i) physiological responses during table tennis matches and training; and (ii) practical recommendations for enhancing aerobic and anaerobic performance in table tennis by improving cardio-metabolic and neuro-muscular fitness, anthropometry and nutritional strategies. Therefore, this review article attempts to narratively provide an overview of the physiology of table tennis by describing the metabolic mechanisms underlying match play and outlining a framework for practical recommendations for improving cardio-metabolic and neuro-muscular fitness, anthropometry as well as nutritional strategies...
June 5, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28578766/editorial-commentary-elbow-lateral-epicondylitis-tennis-elbow-surgery-works-but-is-not-often-indicated
#11
EDITORIAL
Gary G Poehling
In the small percentage of patients who do not respond to nonoperative approaches to tennis elbow, surgery-whether it is open, arthroscopic, or percutaneous-provides near 90% satisfaction rates.
June 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28577784/autologous-blood-and-platelet-rich-plasma-injections-for-treatment-of-lateral-epicondylitis
#12
REVIEW
James H Calandruccio, Murphy M Steiner
Lateral epicondylitis (tennis elbow) is a frequent cause of elbow pain; most patients (80%-90%) are successfully treated with standard nonoperative methods (rest, nonsteroidal anti-inflammatory drugs, bracing, and physical therapy). Autologous blood injections and platelet-rich plasma injections are the two most frequently used orthobiologic techniques in the treatment of lateral epicondylitis. Studies of the effectiveness of autologous blood injections and platelet-rich plasma report varying outcomes, some citing significant clinical relief and others reporting no beneficial effect...
July 2017: Orthopedic Clinics of North America
https://www.readbyqxmd.com/read/28574416/richly-innervated-soft-tissues-covering-the-superficial-aspect-of-the-extensor-origin-in-patients-with-chronic-painful-tennis-elbow-implication-for-treatment
#13
C Spang, H Alfredson
BACKGROUND: Tennis elbow is difficult to treat. The results of surgical treatments are not convincing. Treatment studies on Achilles and patellar tendinopathy targeting the richly innervated and vascularized soft tissues outside the tendon have shown promising outcomes. The innervation patterns in the fibrous/fatty tissues superficially to the elbow extensor origin have not been clarified. METHODS: Nine tissue specimens from the fibrous/fatty tissue covering the extensor origin was taken from seven patients (mean age: 45 years) undergoing surgical treatment for chronic painful tennis elbow...
June 1, 2017: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/28572986/social-associations-between-california-sea-lions-influence-the-use-of-a-novel-foraging-ground
#14
Zachary A Schakner, Matthew B Petelle, Mathew J Tennis, Bjorn K Van der Leeuw, Robert T Stansell, Daniel T Blumstein
Social relationships define an individual's position in its social network, which can influence the acquisition and spread of information and behavioural variants through the population. Thus, when nuisance behaviours spread through wildlife populations, identifying central individuals may provide valuable insights for problem-species management. We studied the effects of network position on California sea lion (Zalophus californianus) discovery and foraging success at a novel foraging ground-the salmonids that aggregate at the Bonneville Dam tail-race, 235 km up the Columbia River...
May 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28567011/imaging-brain-function-with-functional-near-infrared-spectroscopy-in-unconstrained-environments
#15
Joana B Balardin, Guilherme A Zimeo Morais, Rogério A Furucho, Lucas Trambaiolli, Patricia Vanzella, Claudinei Biazoli, João R Sato
Assessing the neural correlates of motor and cognitive processes under naturalistic experimentation is challenging due to the movement constraints of traditional brain imaging technologies. The recent advent of portable technologies that are less sensitive to motion artifacts such as Functional Near Infrared Spectroscopy (fNIRS) have been made possible the study of brain function in freely-moving participants. In this paper, we describe a series of proof-of-concept experiments examining the potential of fNIRS in assessing the neural correlates of cognitive and motor processes in unconstrained environments...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28566783/a-comparative-study-to-evaluate-the-efficacy-of-platelet-rich-plasma-and-triamcinolone-to-treat-tennis-elbow
#16
Vanamali B Seetharamaiah, Amrit Gantaguru, Sunil Basavarajanna
BACKGROUND: Lateral elbow pain is common with a population prevalence of 1%-3%. The study was a comparative trial to validate the efficacy of single injection of platelet-rich plasma (PRP) for tennis elbow as compared with single injections of triamcinolone and placebo (normal saline) over a short term period. MATERIALS AND METHODS: Comparative trial with 3- and 6-month followup evaluated with visual analog scale (VAS) and facial pain scale (FPS). Our study included a total of eighty patients with unilateral or bilateral tennis elbows...
May 2017: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/28555116/interaction-between-gender-and-skill-on-competitive-state-anxiety-using-the-time-to-event-paradigm-what-roles-do-intensity-direction-and-frequency-dimensions-play
#17
John E Hagan, Dietmar Pollmann, Thomas Schack
Background and purpose: The functional understanding and examination of competitive anxiety responses as temporal events that unfold as time-to-competition moves closer has emerged as a topical research area within the domains of sport psychology. However, little is known from an inclusive and interaction oriented perspective. Using the multidimensional anxiety theory as a framework, the present study examined the temporal patterning of competitive anxiety, focusing on the dimensions of intensity, direction, and frequency of intrusions in athletes across gender and skill level...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28553852/an-anatomical-study-of-additional-radial-wrist-extensors-including-a-unique-extensor-carpi-radialis-accessorius
#18
Charles Timothy West, David Ricketts, Cecilia Brassett
BACKGROUND: In this study, 82 forearms from 41 cadavers were dissected to establish the incidence of variant additional radial wrist extensors. Three variants have been described in the literature: extensor carpi radialis intermedius (ECRI), extensor carpi radialis accessorius (ECRA) and extensor carpi radialis tertius (ECRT). MATERIALS AND METHODS: Of the 41 cadavers studied, 5/41 (12%) had an additional radial wrist extensor. Of these 5 individuals, 2 had bilateral additional muscles and 3 were unilateral...
May 29, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/28552657/out-of-hospital-cardiac-arrests-during-exercise-among-urban-inhabitants-in-japan-insights-from-a-population-based-registry-of-osaka-city
#19
Kosuke Kiyohara, Junya Sado, Tasuku Matsuyama, Chika Nishiyama, Daisuke Kobayashi, Takeyuki Kiguchi, Sumito Hayashida, Yuri Kitamura, Tomotaka Sobue, Ken Nakata, Taku Iwami, Tetsuhisa Kitamura
BACKGROUND: The patient characteristics, pre-hospital interventions, and outcomes of out-of-hospital cardiac arrests (OHCA) occurring during exercise, have not been sufficiently investigated among the general population. METHODS: OHCA data from 2009 to 2015 were obtained from the population-based OHCA registry in Osaka City, Japan. Patients who suffered OHCA, which occurred during exercise before the arrival of emergency medical service personnel, were included...
May 25, 2017: Resuscitation
https://www.readbyqxmd.com/read/28536215/sesamoid-osteonecrosis-treated-with-radial-extracorporeal-shock-wave-therapy
#20
Dawn Thompson, Nikos Malliaropoulos, Nat Padhiar
Sesamoid osteonecrosis is a disabling condition resulting in severe forefoot pain, for which there are limited treatment options. We present a 52-year-old man with 1-year history of pain, aggravated by walking and playing tennis. On examination, pain was localised to plantar aspect of the first metatarsophalangeal joint. Imaging revealed evolving end-stage avascular necrosis of lateral sesamoid with early secondary degenerative changes. Previous exhaustive conservative treatment had been unsuccessful in alleviating his pain...
May 22, 2017: BMJ Case Reports
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