tennis technology in coaching, ptr international symposium 2017
TRANSCRIPT
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AcknowledgementsBesides the usual suspects,
• Paul Robbins, Stats.com LLC• Donny Soh, QLIPP• Rick Gould, TuringSense
• Yuval Bar Yosef, PlaySight • Peter Lyons, Babolat• USTA PD & Sport Science Committee
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Technology - How Can it Help?• Measure Physical abilities• Enhance Teaching• Analysis of Tactics (Analytics)• See New Things (we never noticed)• Understand Techniques and Tactics• Revolutionize Learning• Excitement – new twists
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Different Technologies Work Together
Smart Phones and Tablets Racquet Sensors Wearable Technology
Analytics Apps Technical Apps Practice Apps
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Useful Technology• Easy Learning Curve• Add Value to Lessons/Coaching• Frequent Use• Will Help Student (or Coaches)
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What’s in Your Smart Phone?• Magnetometer• Satellite GPS• Gyroscope• Accelerometer• Proximity Sensor• (Barometer, Light Sensor, Heart Rate Monitor)
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Racquet SensorsBabolat POPQLIPP SensorSony Smart Tennis SensorZepp Tennis Sensor
Basic Features of All:Identify shot type (Forehand, Backhand, Serve, Volley)Identify racquet head speedQualitative spin identificationStores data
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Babolat POP• Price $69 (MSRP $89)• Easy to Set Up• Works with All Racquets• Can Compare with friends• Intrusive wrist band• Misses some shots (misses ~10-20%)• Short battery & bluetooth issues• Misidentifies some shots (~10%, poor wrist placement)• Poo speed accuracy (10-25% off)
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QLIPP Sensor• Price $99 (MSRP $129)• Easy to Set Up• Unintrusive Placement on Strings• Works with All Racquets• Video Pairing• Ball & Racquet Speed • Sweet spot• Records almost all shots (~98+%)• Longest Battery and best Bluetooth pairing• Speed Accuracy is good (~10%)• Records Qualitative Spin• Can be tough to remove
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Sony Smart Tennis Sensor• Price $165 (MSRP $199)• Can Take a While to Set Up• Unintrusive Placement on Butt• Works with Some Latest Racquet Models (HEAD, Prince, Wilson,
Yonex)• Video Pairing with Data on Video• Ball & Racquet Speed • Graphical Display• Records most shots (~90-95+%)• Short Battery and poor Bluetooth pairing• Speed Accuracy may be best(~5-10%)• Records Qualitative Spin
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Zepp Tennis Sensor• Price $99 (MSRP $149)• Needs calibration and set up takes some time• Intrusive Placement on Butt (Flex Mount, Pro Mount)• Works with All Racquets• Ball & Racquet Speed • 3D Serve • Records nearly all shots (~98+%)• Good battery and bluetooth • Speed Accuracy is fair (~10-15%)• Records Qualitative Spin• Can misidentify shot types and spins
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QLIPP MODE 3: SERVE MODE• Calculates the serve form:
• Ensures there is proper backswing, good
acceleration and follow through
• Calculates the estimated serve speed based a
combination of:
• Racquet head speed
• Racquet acceleration
• Sweet spot
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Tactical Analytics • Macro systems
• PlaySight• Hawkeye
• Micro systems• Pro Tracker• Game Changer• Traditional Stats (TennisStats, MyTennisStats)
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20
Soccer and Basketball have been using cameras to track performance – like Hawkeye does for the ball
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Now we can use the same XYZ data to track tennis players
Hawkeye- acce/decel data
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Distance (meters) Meters player traveled during point
Duration (seconds) Time duration of each point
Max Speed (max [meters/second]) Max speed within each point
Average Speed (avg [meters/second])Average Speed during each point
Kinetic Energy (sum[1 kg meter2 / second2])Total Kinetic energy used in each point
Accel/decel loads and numbers based on intensity
Speed and EnergyExample of a player’s movement during
point
**Player tracking graph created for each point
Point start
point end
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Physio and Mech load/intensity
Identify high-stress specific movements, match up with video
Assess within-point inefficiencies
Distance = 33.8 metersDuration = 16.04 secondsMax speed = 5.54 m/sKinetic Energy = 2835 JAcceleration Stress = 13.8Deceleration Stress = 7.71Acceleration 1 = 4Acceleration 2 = 1Acceleration 3 = 2Acceleration 4 = 3Deceleration 1 = 4Deceleration 2 = 2Deceleration 3 = 1Deceleration 4 = 2
Play-by-PlayVelocity Graph (meters/second)
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The aim of this paper is to discover patterns of player movement and ball striking in tennis using HawkEye data which are indicative of changing the probability of winning a point.
“The Thin Edge of the Wedge” Xinyu Wei1, Patrick Lucey2, Stuart Morgan3, Machar Reid4 and Sridha Sridharan1 : Accurately Predicting Shot Outcomes in Tennis using Style and Context Priors
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Winning Probability
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ProTracker$49.99• Traditional Stats• Service, Return, Deciding Shots Placement• Momentum• No Ad
• Not Flexible for Match Length
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Game Changer• $24.99• Traditional Stats Specialty Shots• Service, Return, • Deciding Shots Placement• Various Scoring
• Not Flexible for • Match Length
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Micro Video Analysis• Low Budget• Smart Phone for Camera and App Software• Comparison Side by Side, Pro Library• Sharing with Students and Community• Storage and Saving Files
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Comparison of Video Analysis Apps(all available on iTunes and Google play)
• Multiple tiers for features & storage ($4.99 and up)
• High Speed - good• Good video quality, loss in
upload• Learning Curve - easy• Voice Analysis – excellent,
during video• Import/Export – Easy without
locker, allows from camera roll, youtube, GoPro
• Sharing – Easy, public• Tools – good
• GRADE = A-
• Base Cost=$6.99 (ncludes angle tool) - multiple tiers for storage, can be pricey
• High Speed - good• Good video quality• Learning Curve – moderate• Voice Analysis – good, need
to make stills, key positions are useful
• Import/Export –allows from camera rolls, also Dartfish locker
• Sharing – closed• Tools – excellent, synch wheel
is best
• GRADE = B
• Free - but tiers for comparison & storage
• High Speed – best built in• Fair video quality• Learning Curve – easy• Voice Analysis – during video• Import/Export – easy, camera
roll• Sharing – easy, public• Tools – fair
• GRADE = B+
COACH’S EYE DARTFISH EXPRESS HUDL
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Features & Tools
• Import & Export• Synch Wheel• Tools (angles, distances, arrows, lines, circles)• Titles, comments• Voiceovers
• All apps have basic tools. Angles and measuring are more advanced.
• BASICS TOOLS arrows, lines, circles
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Cameras, Tripods & Mounts
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Split Screen Comparisons• Before and after correction/cue
• With a touring pro model
• Over time (e.g, 1-2 years)
• Different angles (multiple cameras)
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Whiteboard Apps• Scout Free
• Free• No Learning Curve• Hand drawing
• CoachNote• $4.99 ($1.99 Google)• Moderate Learning Curve• Can customize• Can do many sports• Icons – could use better tennis icons
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What You Can Use• Racquet Sensor• Video Analysis for Technique• Analytics App• Whiteboard
• Now you are equipped!
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Multiple Sensors
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05/03/2023 TuringSense Confidential
MODEL EXTENSION (4 SEGMENTS)• FE
45
-40 -20 0 20 40 60 80 100 120 140-160
-140
-120
-100
-80
-60
-40
-20
0
20
X-Forward (cm)
Y-D
own
(cm
)Sagittal plane - Right
Elbow sagittal positionWrist sagittal positionInterface sagittal positionRacket sagittal position
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What’s the Future?• More sophisticated analytics tracking• Combined Racquet + Court Sensor• Wearable Technology (multiple sensors for accuracy)• Integrated Tactical/Technical Coaching Systems