Bowls Coaching Technique Analysis Technique analysis SPORT BIOMECHANICS
Bowls Coaching Technique Analysis
Technique analysis SPORT BIOMECHANICS Description of movement patterns § Performance § Efficiency § Injury prevention § Tools: Video Camera
Sports Biomechanics ? ? Concerned with the internal and external forces on the body Internal External
The Coach & Biomechanist A coach must be able to: 1. Identify movement features and deviations 2. Describe positions, phases & actions 3. Explain causes & mechanisms 4. Predict effects & techniques 5. Recommend physical or technical corrections 6. Coach the athlete to make these changes Biomechanist can assist with.
How do we measure? § 2 D video analysis
What do we measure? § § § Body positions Segment sequencing Distance Speed Range of motion Acceleration Force / Torques Impacts Strength Rotational motion Anthropometry Muscle activity
Force – Motion relationship Motion = Force (mass) x Time
Force – Motion relationship Motion = Force (mass) Increased transfer of body weight Increased trunk lean Use of gravity x Time Larger step Higher backswing
Delivery – timeline breakdown 1. Setup – hold and address 2. Trunk initiation 3. Backswing …(initiate step) 4. Top backswing / start forward swing …(Heel of leading leg planted) 5. Forward swing 6. Bowl release 7. Follow through THEY ALL INTER-RELATE
How do we analyse a delivery 1. Identify the problem areas, after you have broken the delivery down into key events and phases, and have viewed video frame by frame. 2. Work BACKWARDS – the inefficiencies will be caused by the preceding phase(s).
Principles of movement SOME FOCUS AREAS § Trunk action generating momentum § Appropriate step width and length § Line of the bowl arm § Timing of lead leg plant with start of forward swing § Weight transfer / body position changes setting up bowl release
DRIVE
DRIVE
DRIVE
Step Length length Step
Arm position at top of back swing DRIVE + 28 deg - 14 deg
Arm position at top of back swing DRIVE + 28 deg - 44 deg
Arm position at top of back swing DRIVE + 28 deg - 20 deg
Trunk position at bowl release
Feedback sheet…
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