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Upper Limb Kinematics During the Topspin Double-Handed Backhand Stroke in Tennis
38th International Society of Biomechanics in Sport Conference, Physical conference cancelled, Online Activities: July 20-24, 2020 UPPER LIMB KINEMATICS DURING THE TOPSPIN DOUBLE-HANDED BACKHAND STROKE IN TENNIS Nicholas A. Busuttil1, Machar Reid2, Molly Connolly2,3, Ben J. Dascombe4 & Kane J. Middleton1 Sport and Exercise Science, School of Allied Health, Human Services, and Sport, La Trobe University, Melbourne, Australia1 Game Insight Group, Tennis Australia, Melbourne, Australia2 Institute for Health and Sport, Victoria University, Melbourne, Australia3 Applied Sport Science and Exercise Testing Laboratory, School of Life and Environmental Sciences, University of Newcastle, Ourimbah, Australia4 The purpose of this study was to compare non-dominant wrist kinematics during tennis double-handed backhand strokes in players using either an eastern or continental grip position. Trajectory data for two grips (eastern & continental) and depths (deep & short) were captured for sixteen sub-elite right-handed tennis players using a 12-camera Vicon motion capture system (250 Hz). The eastern grip demonstrated significantly faster horizontal racket head velocities compared to the continental grip. However, no differences were observed in accuracy or spin rate between grips (p > 0.05). In the non-dominant upper limb for the continental condition, elbow flexion was smaller while wrist extension was larger throughout the swing. Collectively, these data suggest that the continental grip may place the wrist in a position that is more vulnerable to overuse injury. KEYWORDS: ulna, wrist, kinematics, grip, tennis. INTRODUCTION: Acute wrist pain is among the most common issues reported by elite and recreational tennis players, and it is a likely result of the wrist being the first major upper limb joint to absorb ball impact forces (Stuelcken, Mellifont, Gorman, & Sayers, 2017; Elliott, 2006). -
A-4E Finds New Home Tasked with Transferring the Craft
7!1 7 Vol. 24, No. 6 Serving Marine Forces Pacific, MCB Hawaii, Ill Marine Expeditionary Forces, Hawaii and 1st Radio Battalion February 15, 1996 A-4E finds new home tasked with transferring the craft. It LC,p1. Steven Williams is the only unit in Hawaii with heavy-lift capability. The other mili- The Aviation Support Element and tary installations on the island don't Combat Service Support Group-3 have the aircraft to lift the jet, aboard MCB Hawaii teamed up according to Maj. Jesse E. Wrice, Monday to transfer a 7,000-pound ASE operations officer. Douglas A-4E Skyhawk from Naval The six leaders in the transfer pro- Air Station Barbers Point to ject surveyed the jet Jan. 22. to Dillingham Air Field. ensure the aircraft was safe to move. The aircraft was donated to the "We did all of our homework in Find what's got the dolphins Hawaiian Historical Aviation January so it would run smoothly in jumping. See B-1 for story. Foundation, a non-profit organiza- February," said Wrice. tion, Sept. 19 by the Navy's Fleet Before it was transferred, the jet's Composite Squadron 1. The nose gear door was removed and the Great Aloha Run squadron decommissioned in tail hook was dropped. Dropping the September 1993 leaving most of its tail hook allowed the belly bands to transportation aircraft to the National Naval sit flesh on the aircraft's stomach. Aviation Museum in Pensacola, Fla. The team also added 400 to 600 The 12th annual Great Aloha Following the down-size, HHAF put pounds of weight to the nose of the Run will be held Monday at 7 a.m. -
Project Report Porsche Tennis Grand Prix
06/15 Project report Porsche Tennis Grand Prix www.conica.com PROJECT CHALLENGE THE PORSCHE TENNIS WTA INDOOR TENNIS GRAND PRIX ON CLAY COURTS Eight days, total concentration and the best female tennis In 2009, the Porsche Tennis Grand Prix kicked off a new players in the world on the court. The Porsche Tennis Grand era. With an annual indoor tournament on clay courts, Prix, held in the famous Porsche Arena in Stuttgart, is one of the event offered the best female professional tennis the top events in the world of professional tennis. In 1977, a players in the world the perfect opportunity to prepare gala with four professional players was held at indoor courts for the clay season. in Filderstadt-Plattenhardt. This idea led to the first tourna- ment in 1978, which later evolved to become the WTA tourna- The challenge: creating a clay court system that can ment in Filderstadt. Today, the Porsche Tennis Grand Prix is adapt to the technical and environmental conditions of one of the longest-running tournaments on the Women’s Tour an indoor facility and is also easy to install before the and features some of the best players in the world of tennis, tournament and remove afterwards. Furthermore, the making it a premier event on the WTA tour. The Porsche Tennis system must offer ideal clay court conditions – from Grand Prix represents precision, athleticism, competitive spirit the first to the last rally. and excellent technique on a perfect court. FACTS 2015 FEATURES 8 PLAYERS FROM THE TOP 10 AND 13 PLAYERS FROM THE TOP 20 HIGHEST WTA TOURNAMENT CATEGORY AFTER THE FOUR GRAND SLAM TOURNAMENTS SELECTED NUMEROUS TIMES BY THE PLAYERS AS THEIR FAVOURITE WTA TOURNAMENT TOTAL PRIZE MONEY: 731 000 US DOLLARS 37 200 SPECTATORS SOLUTION RESULT CONIPUR® PRO CLAY PERFECT CONDITIONS, FROM CONICA THRILLING TENNIS CONIPUR® PRO CLAY is a clay court system for indoor and The Porsche Tennis Grand Prix 2015 offered the spectators outdoor tennis. -
How the Court Surface Is Affecting the Serve-And-Volley Tristan Barnett
How the court surface is affecting the serve-and-volley Tristan Barnett Strategic Games www.strategicgames.com.au 1. Introduction The modern version of the game (official name of Lawn Tennis) as we recognize it today was designed and patented by Major Walter Clopton Wingfield in 1873. Two years later in 1875, the official rules of the game were drawn up by Marylebone Cricket Club, and two years later in 1877, Wimbledon began on a grass surface as the first official championships. All four grand slam events have been played on a grass surface. Wimbledon is the only grand slam event played on a grass court today and has always been played on a grass court surface. The French Open began in 1891 on a grass surface and remained on grass until 1928 when the surface was changed to clay. The US Open began in 1881 on a grass surface; until it was changed to clay from 1975-1977 and from 1978 has been played on a hard court surface. Finally, the Australian Open began in 1905 on a grass surface and remained on grass until 1988 when the surface was changed to a hard court. There has been a change in the proportion of tournaments played on different court surfaces from 1877 to 2010. Firstly, for the first 14 years of the game, all tournaments (grand slam and non grand slam) were played on grass. Secondly, for the first 101 years of the game all tournaments were played on the natural surfaces of grass and clay. Thirdly, according to the ITF, until the early 1970’s, the majority of tournaments were played on grass including three out of the four grand slams. -
Player Perceptions and Biomechanical Responses to Tennis Court Surfaces: the Implications to Technique and Injury Risk
PLAYER PERCEPTIONS AND BIOMECHANICAL RESPONSES TO TENNIS COURT SURFACES: THE IMPLICATIONS TO TECHNIQUE AND INJURY RISK Submitted by Chelsea Starbuck, to the University of Exeter as a thesis for the degree of Doctor of Philosophy in Sport and Health Sciences September 2014 This thesis is available for Library use on the understanding that it is copyright material and that no quotation from the thesis may be published without proper acknowledgement. I certify that all material in this thesis which is not my own work has been identified and that no material has previously been submitted and approved for the award of a degree by this or any other University. (Signature) ……………………………………………………………………………… 1 Abstract Elite tennis players are required to perform on a variety of tennis court surfaces which differ in mechanical characteristics, such as friction and hardness, influencing their performance and risk of injury. To understand the influence of surfaces on performance and injury risk, three studies were conducted to investigate tennis players’ perceptions and biomechanical responses during tennis-specific movements on different court surfaces. In study 1, tennis players perceptions of acrylic and clay courts were identified following a thematic inductive analysis of semi-structured interviews (n = 7) to develop of a series of visual analogue scales (VAS) to quantify perceptions during studies 2 and 3. Perceptions of predictability of the surface and players’ ability to slide and change direction emerged, in addition to anticipated perceptions of grip and hardness. Study 2 aimed to examine the influence of court surfaces and prior clay court experience on perceptions and biomechanical characteristics of tennis-specific skills. -
Virtual Tennis Happenings
Virtual Tennis Happenings Practice tennis techniques at home! Our Tennis Director, Mike and Assistant Tennis Pro, Ray, send out weekly tennis tip videos, virtual competitions, and more! Contact Mike today ([email protected]) to get more information and added to the Tennis Listserv. Be sure to follow us on Facebook and Instagram for additional tennis and fun! Tennis Tips • 10 Tennis Drills to do Without a Court Step Bend and Lean • How To Replace an Overgrip Serve Technique • How To Measure Grip Size 5 Tips for Buying a Tennis Racquet • Difference Between Regular Duty and Extra Duty 3 Drills for Better Volleys Tennis Balls Forehand and Backhand Technique • Drop Shot Tips The Top 10 Things That Are Costing You Wins In • Footwork at the Baseline Match play • 100 Ball Challenge 3.0 vs 5.0 NTRP Doubles • 7 Weird Tennis Rules Tennis Tips – Returning to the Courts • Approach Shot Footwork Cool Down Exercises for Tennis Players • Improve your Racquet Head Speed from Home The BEST 10 Minute Warm Up The Rules of Tennis – Explained 4 Step Progression to Better Footwork Tennis Scoring System History Easy Trick to Improve Feel on the Forehand Beginner Tennis Tips 5 Clever Uses for Tennis Balls Returning Serves How to Crush the Lob Every Time Social Distance Buddy Tennis The Correct Tennis Volley Grip 3 Ways to Get More Topspin On Your Forehand How to Aggressively Return a Weak Tennis Serve Split Hit Drill Stop Getting Bullied at the Net In Doubles PTR Professional Tennis Tips . -
Tennismatchviz: a Tennis Match Visualization System
©2016 Society for Imaging Science and Technology TennisMatchViz: A Tennis Match Visualization System Xi He and Ying Zhu Department of Computer Science Georgia State University Atlanta - 30303, USA Email: [email protected], [email protected] Abstract hit?” Sports data visualization can be a useful tool for analyzing Our visualization technique addresses these issues by pre- or presenting sports data. In this paper, we present a new tech- senting tennis match data in a 2D interactive view. This Web nique for visualizing tennis match data. It is designed as a supple- based visualization provides a quick overview of match progress, ment to online live streaming or live blogging of tennis matches. while allowing users to highlight different technical aspects of the It can retrieve data directly from a tennis match live blogging web game or read comments by the broadcasting journalists or experts. site and display 2D interactive view of match statistics. Therefore, Its concise form is particularly suitable for mobile devices. The it can be easily integrated with the current live blogging platforms visualization can retrieve data directly from a tennis match live used by many news organizations. The visualization addresses the blogging web site. Therefore it does not require extra data feed- limitations of the current live coverage of tennis matches by pro- ing mechanism and can be easily integrated with the current live viding a quick overview and also a great amount of details on de- blogging platform used by many news media. mand. The visualization is designed primarily for general public, Designed as “visualization for the masses”, this visualiza- but serious fans or tennis experts can also use this visualization tion is concise and easy to understand and yet can provide a great for analyzing match statistics. -
Characterisation of Ball Degradation Events in Professional Tennis
Sports Eng DOI 10.1007/s12283-017-0228-z ORIGINAL ARTICLE Characterisation of ball degradation events in professional tennis 1,2,3 1 3 1 Ben Lane • Paul Sherratt • Xiao Hu • Andy Harland Ó The Author(s) 2017. This article is published with open access at Springerlink.com Abstract Tennis balls are acknowledged to degrade with appears to influence the distribution of ball speed on impact use and are replaced at regular intervals during professional with the surface or racket, suggesting a surface-specific matches to maintain consistency and uniformity in per- degradation test may be beneficial. As a result of these formance, such that the game is not adversely affected. findings a new test protocol has been proposed, utilising the Balls are subject to the international tennis federation’s in-play data, to define the frequency of impacts and impact (ITF) ball approval process, which includes a degradation conditions to equate to nine games of professional tennis test to ensure a minimum standard of performance. The across the different surfaces. aim of this investigation was to establish if the ITF degradation test can assess ball longevity and rate of Keywords Tennis Á Ball Á Impact Á Hawk-Eye Á Surface Á degradation and determine if there is a need for a new Speed Á Angle Á Degradation degradation test that is more representative of in-play conditions. Ball tracking data from four different profes- sional events, spanning the three major court surfaces, 1 Introduction including both men’s and women’s matches were analysed. The frequency of first serves, second serves, racket impacts Approximately 360 million tennis balls are manufactured and surface impacts were assessed and the corresponding each year [1], with wholesale sales figures in the region of distribution of ball speed and (for surface impacts) impact $92 million in the United States alone in 2015 [2]. -
Judy Murray Tennis Resource – Secondary Title and Link Description Secondary Introduction and Judy Murray’S Coaching Learn How to Control, Cooperate & Compete
Judy Murray Tennis Resource – Secondary Title and Link Description Secondary Introduction and Judy Murray’s Coaching Learn how to control, cooperate & compete. Philosophy Start with individual skill, add movement, then add partner. Develops physical competencies, such as, sending and receiving, rhythm and timing, control and coordination. Children learn to follow sequences, anticipate, make decisions and problem solve. Secondary Racket Skills Emphasising tennis is a 2-sided sport. Use left and right hands to develop coordination. Using body & racket to perform movements that tennis will demand of you. Secondary Beanbags Bean bags are ideal for developing tracking, sending and receiving skills, especially in large classes, as they do not roll away and are more easily trapped than a ball. Start with the hand and mimic the shape of the shot. Build confidence through success and then add the racket when appropriate. Secondary Racket Skills and Beanbags Paired beanbag exercises in small spaces that are great for learning to control the racket head. Starting with one beanbag, adding a second and increasing the distance. Working towards a mini rally. Move on to the double racket exercise which mirrors the forehand and backhand shots - letting the game do the teaching. Secondary Ball and Lines Always start with the ball on floor. Develop aiming skills by sending the ball through a target area using hands first before adding the racket. 1 Introduce forehand and backhand. Build up to a progressive floor rally. Move on to individual throwing and catching exercises before introducing paired activity. Start with downward throw emphasising V-shape, partner to catch after one bounce. -
Glossary of Tennis Terms
Glossary of Tennis Terms • A o Ace: a service point won by the server because the receiver doesn’t return, or even touch, the ball. Advantage (or ad) court: left-hand side of the court. o Advantage (or Ad): the point played after deuce, which if won, ends the game. o Advantage set: a set that can only be won when one opponent has won six games and is two games clear of their opponent. o All: term used when both players have the same number of points from 15-15 (15-all) to 30- 30 (30-all). When the score is 40-40 the term is deuce. o All-court player: someone who is equally comfortable playing from the baseline, mid-court and net. o Alley: (see tramlines.) o Approach shot: a shot used by a player to pin their opponent behind the baseline so that they can run to the net for a volley. • B o Back court: area behind the court between the baseline and the back fence. o Backhand: shot struck by holding the racquet in the dominant hand but swinging the racquet from the non-dominant side of the body with the back of the dominant hand pointing in the direction the ball is being hit. (See also two-handed backhand.) o Backspin: spin imparted on the underside of the ball causing it to revolve backwards while travelling forwards. Used in slice and drop shots. o Backswing: component of the swing where the racquet is taken back behind the body in preparation for the forward motion that leads to contact with the ball. -
Measurements of the Horizontal Coefficient of Restitution for a Superball and a Tennis Ball
Measurements of the horizontal coefficient of restitution for a superball and a tennis ball Rod Crossa) Physics Department, University of Sydney, Sydney, NSW 2006 Australia ͑Received 9 July 2001; accepted 20 December 2001͒ When a ball is incident obliquely on a flat surface, the rebound spin, speed, and angle generally differ from the corresponding incident values. Measurements of all three quantities were made using a digital video camera to film the bounce of a tennis ball incident with zero spin at various angles on several different surfaces. The maximum spin rate of a spherical ball is determined by the condition that the ball commences to roll at the end of the impact. Under some conditions, the ball was found to spin faster than this limit. This result can be explained if the ball or the surface stores energy elastically due to deformation in a direction parallel to the surface. The latter effect was investigated by comparing the bounce of a tennis ball with that of a superball. Ideally, the coefficient of restitution ͑COR͒ of a superball is 1.0 in both the vertical and horizontal directions. The COR for the superball studied was found to be 0.76 in the horizontal direction, and the corresponding COR for a tennis ball was found to vary from Ϫ0.51 to ϩ0.24 depending on the incident angle and the coefficient of sliding friction. © 2002 American Association of Physics Teachers. ͓DOI: 10.1119/1.1450571͔ I. INTRODUCTION scribed as fast, while a surface such as clay, with a high coefficient of friction, is described as slow. -
All Tennis Grips Explained Clearly
All Tennis Grips Explained Clearly The tennis grips you use have a big influence on your style of play. This is because the tennis grip is one of the factors that determines how much of spin you put and how much of pace you generate. One grip is not better than another. You should select a grip that helps your style of play. If you are an aggressive player, choose a grip that allows you to hit through the ball and put more pace (think Federer). If you are more of a consistent player, choose a grip that allows you to put more spin (think Nadal). The tennis racket grip is divided into 8 bevels as shown in the diagram. The type of grip depends on which bevel the Index Knuckle and Heel Pad rest. All of the tennis grip diagrams below assume that you are right handed. If you are left handed just reverse the instructions. Serve Continental Grip Use this for the serve, volley, overhead, and slice (all the pros do). The Index Knuckle and Heel Pad rest on bevel 2. Forehand There are three forehand grips. Each grip has its own natural height at which you would contact the ball. The higher the natural contact point, the more naturally you hit across the back of the ball from bottom to top, and more top spin you put on the ball at the expense of pace. This will be clearer as you read about the three forehand grips. Eastern Forehand Grip Index Knuckle and Heel Pad rest on the 3rd bevel.