20130321080339VideoTechnologyandCoaching Ong

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    Video Technology and Coaching

    Centre for Biomechanics

    Faculty of Sport Science

    Ong Kuan Boon Ph.D

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    Presen tat ion Out l ine What? Video Technology is used

    Why? We use Video in Coaching

    How? We use the technology

    - Qualitative Analysis- Quantitative Analysis

    Summary and The Future

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    What Video Technology is Used

    Videodigital recording (vs analogue PAL, NTSC)DV vs VCD, DVD, HDV, AVCHD

    Camcorders, CamerasVideo qualityShutter speed, frame rateCameras types

    Computer control

    Capture and displayData base and analysis

    Telemetry, the Internet

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    What Video Technology is Used

    Videodigital recording (vs analogue PAL, NTSC)

    Camcorders, Cameras

    Video quality

    3CCD DVHigh shutter speed vs high frame rateSpecial purpose camerasFirewire vs CameraLink vs Ethernet

    Computer controlCapture and displayData base and analysis

    Remote - Telemetry, the Internet

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    What Video Technology is Used

    Videodigital recording (vs analogue PAL, NTSC)

    Camcorders, CamerasVideo quality

    Shutter speed, frame rateCameras types

    Computer controlCapture and display

    Multiple screen displayDrawing, measurement, motion tracking

    Video data base vs analysisGeneral vs Sport Specific software

    Remote - Telemetry, the Internet Web Servers

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    Why We Use Video in Coaching

    Images can help the coach convince theathlete about needed technique corrections

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    Why We Use Video (continued)

    Can present images the coach could never see

    High shutter speeds Stop motion

    High frame rates provide more images

    Computer control to compare images

    Video gives the coach an extra tool when

    working with the athlete

    Coach can review and analyse the performance

    after the event

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    Why We Use Video (continued)

    Can put the camera where the coach cant go

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    How We Use the Technology

    From a sports biomechanics perspective

    to identify and correct faults in skill executionusing a minimum of measurements= Qualitative Video Analysis

    Describing and explaining performance skillsusing measurement systems in biomechanics

    = Quantitative Video Analysis

    To improve performance and reduce injury risk

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    Qualitative Video Analysis

    The Process:

    Match Analysis- to identify players skillsproblem areas

    Skill Analysis - to assess and makechanges to technique

    Training Applications - to providefeedback to coach and athlete in training

    Presentation - to coaches and athletes ofvideo and analysis reports from training orcompetition

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    Match Analysis:Preventing Tackle Injuries

    in Womens Hockey

    Purposes

    To identify player actions in the tackle

    situations that are associated with injury.

    To make recommendations to prevent

    injuries occurring in tackles.

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    Methods

    Analysed video footage of 18 games of the2002 Champions Trophy in Macau

    Used SportsCode Pro software and codedplayer actions identified as occurring intackles

    Coded actions in injury tackles and intackles

    for which there was no injury associated

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    Results

    174 tackles were observed per game

    75 % of all on-field injuries occurred intackles

    The injury rate was 1/100 tackles

    Tackler more likely to get injured thandribbler

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    Actions associated with

    increased tackle injury risk Contact with another player or the

    ground

    Open dribble (speed?)

    Side stepping into

    path of other player

    The stick being swunginto the tackle

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    Desirable (safer) tackles

    Side-on tackleReverse-stick tackle

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    High injury risk tackles

    Dive tackle

    Front-on (contact) tackle

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    Qualitative Video Analysis

    The Process:

    Match Analysis- to identify players skillsproblem areas

    Skill Analysis - to assess and make changesto technique

    Training Applications - to provide feedback

    to coach and athlete in training Presentation - to coaches and athletes of

    video and analysis reports from training orcompetition

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    Qualitative Skill Analysis

    Determine what to observe and how to observe

    Observe the performance

    Assess the performance and identify faults

    Evaluate faults based on biomechanics principles

    Instruct the performer / coach

    F ive steps involved!

    Adapted from Hay and Reid

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    Skill Analysis 1.What to observe?

    MODEL -Factors affecting performanceHockey push out

    TRAP

    (in least time)

    SPEED DIRECTION

    FORCES TIME STANCE BALANCE

    NUMBER

    OF SEGMENTS

    RADIUS

    OF ROTATION

    ARM EXTENSION TRUNK LEAN

    HEAD POSITION FOOT PLACING

    CG HEIGHTTRUNK POSITION

    (OPEN/CLOSED)

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    Qualitative Skill Analysis

    Determine what to observe and how to observe

    Observe the performance

    Assess the performance and identify faults

    Evaluate faults based on biomechanics principles

    Instruct the performer / coachAdapted from Hay and Reid

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    Skill AnalysisObserve the Performance

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    Qualitative Video Analysis

    The Process:

    Match Analysis- to identify players skillsproblem areas

    Skill Analysis - to assess and make changesto technique

    Training Applications - to provide feedback

    to coach and athlete in training Presentation - to coaches and athletes of

    video and analysis reports from training orcompetition

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    Training Application

    Instantfeedback

    Players canwork ontheir skillsself monitor

    SoftwareSC WARP

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    Qualitative Video Analysis

    The Process:

    Match Analysis- to identify players skillsproblem areas

    Skill Analysis - to assess and make changesto technique

    Training Applications - to provide feedback

    to coach and athlete in training Presentation - to coaches and athletes ofvideo and analysis reports from training orcompetition

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    Expert System Input

    siliconCOACHreportPAC

    Centralisedreports

    Track over time,monitorimprovement.

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    Standardised Reports

    Project Modified Date Wizard Analyst Client

    Bike Fitting Test 2006-04-07 Dialed in Motion: Road Barry Wilson Nick Flyger

    Aspect Title:Seat height

    Exemplar: Client's Image:

    The seat height is set relative to the bottom bracket and pedal when the pedal is

    vertical. When the foot is at an angle of 10 degrees, the knee should be between 141

    to 145 degrees when measured down the back of the leg.

    mailto:[email protected]:[email protected]
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    Quantitative Video Analysis

    The Process:

    Decide what to measure

    Video the skill

    Video digitisingmanual or automated.

    to measure point locations off video image

    Mathematical Analysis

    to determine variables of interesta-priori

    models Presentation to Coaches and Athletes

    To describe and explain motion

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    Quantitative Video Analysis

    Hockey Drag Flick: What to Measure?

    Hockey Hit

    NUMBER

    OF SEGMENTS

    EXTENSION

    OF ARMS

    TRUNK

    LEAN

    RADIUS

    OF ROTATION

    FORCES TIME

    SPEED

    STANCE

    FOOT PLACING CG HEIGHT

    BALANCE

    DIRECTION DECEPTION

    GOAL

    Hockey Drag Flick

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    Hockey Drag Flick - 3D Study Three cameras at approx right angles

    Rear view - focus on the drag flick

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    Measurement

    Kinematic and temporalvariables at key points:

    (a) At right foot contact

    with the ground

    (b) At stick contact with

    the ball

    (c) At left foot contact with

    the ground(d) At ball release off face

    of stick

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    Presentation to coach

    If A picture is worth a thousand wordsHow much is a video worth?

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    Selected Drag Flick comparisons

    Variable

    Mean

    (SD)

    Malaysia,

    N=5

    Pakistan

    N=4

    Australia

    N=2 N=3

    Argentina

    N=5

    Total drag

    time s

    0.32

    (0.07)

    0.37

    (0.03)

    0.30

    (0.01)

    0.30

    (0.02)

    0.56

    (0.06)

    Drag distance

    m

    0.67

    (0.42)

    1.27

    (0.11)

    1.23

    (0.04)

    1.60

    (0.36)

    1.00

    (0.19)Ball Velocity

    m/s

    23.0

    (1.4)

    27.8

    (3.8)

    24.0

    (0.3)

    28.2

    (3.0)

    19.6

    (3.6)

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    -0.5 m 0.25 m 1.0m

    Example drag-flick: 1.75m drag, 1.25 m step

    length, contact and release distances, 27m/s speed.

    9 m/s 27 m/s

    Stop Release

    1.25m

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    SummaryWe have considered: What video technology is used

    - To give the coach something extra

    Why we use video in coaching- Improve performance and injury prevention

    How we use the technology

    Qualitative Match Analysis, skill analysis,

    video feedback, presentationsQuantitative Analysis

    Measurement and description

    -Systematic approaches and fast feedback

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    The Fu tu re?

    Common use of high speed video

    Auto-coding of video in performance

    analysis

    Video real-time skill analysis and coach

    feedback

    Video linked to real-time animation

    Badminton A tomatic match anal sis

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    BadmintonAutomatic match analysis

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    Swim speed, stroke length and frequency in real time

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    Video plus animation in real time

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    Thank you

    for your attention

    Acknowledgements: My colleagues at ISN for

    their critical comments and video clips.