Linear Acceleration Presentation
- 1. Linear AccelerationLinear Acceleration PresentationPresentation Cade JonesCade Jones
- 2. Acceleration Error ModelAcceleration Error Model Avoid Excessive Trunk FlexionAvoid Excessive Trunk Flexion Monitor Backside Ankle Mechanics (NoMonitor Backside Ankle Mechanics (No Collapse)Collapse) Ensure Proper Backside Hip ExtensionEnsure Proper Backside Hip Extension Develop Efficient Initial Contact withDevelop Efficient Initial Contact with Ground (No Deceleration)Ground (No Deceleration)
- 3. Subject: Corey CampbellSubject: Corey Campbell Develop appropriate linear accelerationDevelop appropriate linear acceleration starting position to optimize accelerationstarting position to optimize acceleration speed and mechanicsspeed and mechanics Lower Pre Test start timeLower Pre Test start time Develop good first step qualityDevelop good first step quality Monitor Front Side Knee Mechanics andMonitor Front Side Knee Mechanics and Stride LengthStride Length
- 4. Individual AnalysisIndividual Analysis Eversion/Pronation at the ankle and footEversion/Pronation at the ankle and foot Hip RetroversionHip Retroversion Utilizes Frontal Plane MovementUtilizes Frontal Plane Movement Large First StepLarge First Step Greater Angles of Knee and Ankle FlexionGreater Angles of Knee and Ankle Flexion during starting positionduring starting position
- 5. Start PhaseStart Phase Longer Ground Contact Time (0.12-0.18s)Longer Ground Contact Time (0.12-0.18s) Forward Velocity is Relatively LowForward Velocity is Relatively Low Hip and Knee Extension must be wellHip and Knee Extension must be well coordinatedcoordinated Knee Extension must never precede hipKnee Extension must never precede hip extension in order to ensure optimal forceextension in order to ensure optimal force transfer (The Ground Reaction force will betransfer (The Ground Reaction force will be more vertical)more vertical) Rectus Femoris is Active, very little hamstringRectus Femoris is Active, very little hamstring involvementinvolvement
- 6. Start PhaseStart Phase BoschBosch ““The longer contact time with the ground makesThe longer contact time with the ground makes it possible to compensate for rotations that haveit possible to compensate for rotations that have developed during the previous push-off, withoutdeveloped during the previous push-off, without needing to reduce the force of the push off”needing to reduce the force of the push off” More difficult to preload the muscle, so theyMore difficult to preload the muscle, so they work less reactively then during speed runningwork less reactively then during speed running Mainly Glutes, Quads, and Dorsal MusclesMainly Glutes, Quads, and Dorsal Muscles during startduring start Key is PostureKey is Posture
- 7. Start PhaseStart Phase Force Down and BackForce Down and Back Dorsiflexion and Ankle TensionDorsiflexion and Ankle Tension Hips must be held low, but requiresHips must be held low, but requires tremendous forcetremendous force Complete extensionComplete extension Favorable projection of the body’s centerFavorable projection of the body’s center of gravity onto the ground in front of theof gravity onto the ground in front of the point of supportpoint of support
- 8. Start PhaseStart Phase Arm Action in Saggital PlaneArm Action in Saggital Plane Pelvis and Shoulders move in the Frontal andPelvis and Shoulders move in the Frontal and Transverse Planes to support push-off (Wider startingTransverse Planes to support push-off (Wider starting position)position) At the moment of initial contact, the shoulder and the hipAt the moment of initial contact, the shoulder and the hip are closer together on the side of the stance legare closer together on the side of the stance leg At the moment of toe-off, the situation is simply reversedAt the moment of toe-off, the situation is simply reversed During short floating phase, frontal plane movement isDuring short floating phase, frontal plane movement is not necessarynot necessary External Rotation of hip and lower leg can beExternal Rotation of hip and lower leg can be advantageous to acceleration mechanicsadvantageous to acceleration mechanics
- 9. Pre Starting Position Relative andPre Starting Position Relative and Absolute AnglesAbsolute Angles https://www.coachseye.com/v/c6OFhttps://www.coachseye.com/v/c6OF Pre AbsolutePre Absolute https://https://www.coachseye.com/v/mwbPwww.coachseye.com/v/mwbP Pre RelativePre Relative
- 10. Pre 5 Yard Split TimePre 5 Yard Split Time https://www.coachseye.com/v/epH7https://www.coachseye.com/v/epH7
- 11. Drill SelectionDrill Selection Day 1:Day 1: Wall Posture HoldWall Posture Hold Load N LiftLoad N Lift Wall March Single ExchangeWall March Single Exchange Harness Acceleration MarchHarness Acceleration March Harness Acceleration Skip/BoundHarness Acceleration Skip/Bound Free StartsFree Starts
- 12. Drill SelectionDrill Selection Day 2:Day 2: Harness Acceleration MarchHarness Acceleration March Harness Acceleration SkipHarness Acceleration Skip Pop, Float, and SkipPop, Float, and Skip Lean, Fall, RunLean, Fall, Run Free StartsFree Starts
- 13. Drill SelectionDrill Selection Day 3:Day 3: Harness BoundHarness Bound Lean Fall RunLean Fall Run Med Ball Chest Pass StartMed Ball Chest Pass Start Free StartsFree Starts
- 14. Drill SelectionDrill Selection Day 4Day 4 Lean, Fall, Run,Lean, Fall, Run, Med Ball Chest Pass StartMed Ball Chest Pass Start Free StartsFree Starts
- 15. Post Starting Position Relative andPost Starting Position Relative and Absolute AnglesAbsolute Angles https://www.coachseye.com/v/Sruwhttps://www.coachseye.com/v/Sruw Post AbsolutePost Absolute https://www.coachseye.com/v/6gUFhttps://www.coachseye.com/v/6gUF Post RelativePost Relative
- 16. Post 5 Yard Split TimePost 5 Yard Split Time https://www.coachseye.com/v/kQV1https://www.coachseye.com/v/kQV1