Objectives Running Analysis: Sprint Presented by Brenton A Hardy, MEd, ATC, CSCS 1. Understand basic sprinting mechanics and utilization of acceleration training in programs 2. Rehabilitation approach to mimichigher level activity and reducing re-injury rate 3. Transition from therapy to optimal human performance The Lost Art What is Acceleration Definition: Increase in rate of speed Physics: the rate of change of velocity per unit of time Newton s 2 and 3 Laws F = MxA Equal and opposite reaction (horizontal ground force) Simple terms: Going from point Ato point Bas explosive and quickly as possible. Force Velocity Curve 1
Force Velocity Curve With Strength Training Power/Intensity Variation Energy Systems Systems ATP-PC 1 to 10 seconds Anaerobic Glycolysis 30 secs to 1 min Aerobic/Oxidative 2mins or more Varies Intensity Adaptation (Train stimulus, adapt, change stimulus) Metabolic Stress Mechanical Stress Acceleration Mechanics Positioning Arm action (pinch pennies) Loose Leg Drive Piston like Angles (body lean) 45 degrees or more Weight distribution in the feet kinesthetic awareness Poor Mechanical Stress Proper Mechanical Stress 2
Hamstring Injuries Strains account for 12-16% Ahigh 22-34% re-injury rate (Morein et al 2015) Risk of injury is at its highest in the late swing phase and is higher for the biceps femoristhan for the medial hamstrings (Guex et al 2012) Hamstring torque increases with increased hip flexion General Strengthening Glute/Back Bridge Series DL/SL/Eccentric PB Hip Ext with Leg Curls DL and SL Nordic Hamstring Curls Prone Physio-ball (aka hissy fits) higher bicep femoris EMG activity (Tsaklis et al 2015) Rehab Approach Soft Tissue Techniques IASTM TPR/ART Supple Leopard (Self myofascial techniques) The more you can move from clinician facilitated to athlete facilitated Input to the system Mobility Mobility = strength + flexibility Voodoo Bands Super Bands BrettzelStretch (global mobility) Lengthen the tissue to own the new ROM Stability Stability = End Range strengthening Can use core assist such as a kettlebell or bands Can also be bodyweight such as DNS posture exercises Goal is to transition through the neurodevelopmental sequence from NWB to WB. 3
Supine Position Supine Position KB Triple Flexion With ASLR SL GB Start End (extension) Side-lying Position Half Kneel Positions VasoStrap Star Extension Half Kneel Single Leg Stance Half Kneel Lift With Rear Foot Elevated Single Leg Stance lift With End Range Psoas Activation 4
Pattern Pattern Static Lower Dynamic Lower Standing Position Extended Position Common Mistakes Common Mistakes Quad dominate Forward Trunk Lean Trunk Flexion Trunk Extension Transition Horizontal Ground Force Wall Drill Versa Climber Hamstrings and Hip extension play a predominate roll in sprinting for force production (Morin et al 2015) Fatigue in the hamstrings become limiting factor (Morin et al 2015) Train energy systems Force production introduction Low level plyometrics and repeated force. 5
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