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Bowls Coaching Technique Analysis Technique analysis SPORT BIOMECHANICS Description of movement patterns Performance Efficiency Injury prevention Tools: Video Camera Sports Sports Biomechanics 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? 2D 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 x Time (mass) Increased transfer of body weight Increased trunk lean Use of gravity 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 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…