Biomechanics of throwing of a javelin

Essay by forest2087High School, 12th grade May 2006

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Throw Phase only for right handed thrower

Mechanics objective: to maximize distance of the throw of the javelin in the air

PHASES:

Preliminary Movements:

* Javelin is held horizontally with three possible grips

1. Index finger grip (American Style):

* Index finger grips the shaft to the rear of the binding.

* Thumb lies along the side of the binding

* The javelin lies in the centre of the palm

2. Second Finger Grip (Finnish Style):

* Index finger is extended along the shaft of the javelin

* Thumb lies along the side of the binding

* Middle finger grips the shaft of the javelin to the rear of the binding

3. V- Grip (Fork Style):

* Index and middle finger grips the shaft of the javelin to the rear of the (V form)

* Thumb lies along the side of the binding

* Stand with right food forward

* Right arm abducted in the sagittal plane, forearm flexed so the elbow is pointed forward

* Palm of the right hand points at sky to provide a platform for the javelin

* Aim the javelin in the direction you are going to run

* Keep the metal tip down just a bit

Preparatory Phase:

* Take 13 to 17 steps (Newton's Second Law)

* Keep hips high and run on the balls of the feet

* Flex the right arm posteriorly to fix the position

* Keep the head facing the way of throwing

* Keep the hips at right angles to the running direction

* Drive the right legs forward and up the help keep hips in proper position

Force Producing Phase:

* Right foot remains close to the ground to maintain forward momentum (Principle #4)

* Right heel (talus) makes contact with the ground

* As the right...