Biomechanics Analysis - Javelin Throw (Section 2)

VIDEO DESCRIPTION:

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Analysis:
The initial difference between the two videos is in relation to stride frequency, stride length and speed. The expert has an increased stride frequency which allows him to increase his stride length throughout the run up allowing him to build up more linear force. The limited build-up of speed/force from the non-expert immediately impacts his ability to maximise distance of the throw.

The next comparison is that of the cross step. The expert is able to maintain momentum while maximising the extension of levers to allow a rotational movement of force when propelling the javelin. The throwing arm is almost at 180 degrees with the opposite arm, which allows the athlete to initiate force through a moment of torque which initiates the rotation of the body when throwing the javelin. The athlete prepares to transfer the momentum gained through the run-up and rotational force through his back leg applying force into the ground which enables him to propel the force into the javelin as it leaves his hand. The non-expert fails to maximise the potential to create force with both levers as he relies solely on his throwing arm to generate force. The expert demonstrates the notion that the more velocity created directly relates to the distance the javelin can be thrown.

The expert is able to transition his force into the throw through increasing his base of support which enables the athlete to generate maximum velocity through his lower body segments. When releasing, it is obvious the non-expert has the javelin in a more vertical position which impacts the angle of release. The supporting arm and javelin form a vertical parallel which reduces the potential distance the javelin can be thrown as it creates a larger surface area to be acted upon by the wind.

In the video of the expert, it is evident the angle of velocity he has created is at 45 degrees which allows for maximum distance of the throw. When he reaches his release point, he is at full extension of his levers and both upper and lower body segments are at a peak point of velocity.

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