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# Biomechanics: Javelin

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## Hayden Stringer

on 6 June 2013

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#### Transcript of Biomechanics: Javelin

By Hayden Stringer 12A Biomechanical Principles Weaknesses Analyzing Specific Errors Drills and Modifications There are seven main principles of biomechanics, that are divided into four main categories; Stability, Maximum Effort, Linear Motion and Angular Motion Run-up
Angle of Release
Foot positioning
Jump/Leap
Speed
Summation of Force Medicine Ball Throws
Soft Ball Throws
Hurdle Jumps
Gym Biomechanics: Javelin Stability Principle #1 The lower the center of gravity, the larger the base of support, the closer the line of gravity to the center of the base of support, and the greater the mass, the more stability increases. Maximum Effort Principle #2 The production of maximum force requires the use of all the joints that can be used. Speed
Technique
Rhythm
Future Recommendations Linear Motion Principle #3 Angular Motion Principle #6 The production of maximum velocity requires the use of joints in order – from the largest to the smallest. Principle #4 The greater the applied impulse, the greater the increase in velocity. Principle #5 Movement usually occurs in the direction opposite that of the applied force. Principle # 7 Angular motion is produced by the application of force acting at some distance from an axis (or a torque) Angular momentum is constant when an athlete or object is free in the air. Run-Up Angle of Release Jump/Leap Summation of Force Run-Up Throw Medicine Ball Throws Soft Ball Throws Method Hurdle Jumps Method Origin of the kinetic energy
Explosive power
Speed
Rhythm Not as important as speed
37-45 degrees is optimum Last three steps
Last supply of kinetic energy Speed/power of run-up
Conversion from lower body to upper body energy through sudden stop
Arm/chest/shoulder power
Angle of arm/body/shoulder
Power & Angle of throw What is Biomechanics? Biomechanics is the study of how the many different components of the body combine to create movement, including the use of muscles, tendons, bones and ligaments (Rogers, 2009). Method Stand with both feet on the line
Hold medicine ball in both hands
Throw from behind the head/throw from shoulder
WIth a partner, or alone Aim Improve strength
Improve throwing angle
Improve technique Throw soft ball the same way as javelin (or as close to it as possible) Aim To simulate the throwing technique of the javelin throw, without the weight of the javelin involved.
Theoretically, should improve angle of release and technique (run-up, arm position, etc.) Place hurdle 3 steps from throw line
Complete full 7-step run-up, jumping over the hurdle after fifth step Aim Improve run-up
Perfect last three steps Angle of release (37-45 degrees)
Consistency
Not fast enough
Poor body positioning
Slowing down/Stopping before throwing Gym Shoulder raises Lateral Raises Tension Pulls Aim Improve Strength
Improve Power More effective use of gym
More prac days per week
More competition based training

Too Low/37-45 degrees/Too High Run-up Throw Angle of release
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