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Title- the Effect of increasing running speed on ground reaction force (GRF)
Introduction
Newton¡¦s 3rd law states that for every action there is an equal and opposite reaction. Due to the force of gravity, we are continuously pulled to the ground. During this process, the bodies forces are counteracted by the ground. This reaction force applied by the ground is called the ground reaction force (GRF), which is basically that the ground repels an equal and opposite force to us. The GRF is an important external force and is normally recorded by a force-plate and is measured in body weights (BW) (Nigg et al 2000)
The KistlerTM force plates use tri-axial piezoelectric force transducers mounted within the corners of each plate to measure the three components (i. ... vertical, anterior-posterior, and medial-lateral) of the ground reaction force. ... The force plate can be used to the record the three components of GRF. ...
Much research has been done on this topic, with the majority studying the support phase during both walking and running. It has been concluded that most people run with the same style (heel/toe) and so the components of the GRF are relatively the same. ... This graph shows all the important features of the vertical and Horizontal forces during running. ... For the Fy graph there is an instant decrease in force (a negative acceleration), this is to stop the subject. ... (All will be discussed in more detail later)
This study was undertaken with the aim to establish what effects different running speeds have on ground reaction forces (GRF), a force platform was used to record two of the three orthogonal components of GRF, Fz, (the vertical component) and Fy (the anterior/posterior horizontal component)
My hypothesis is that as running speeds increase so will the ground reaction forces, the impact peak will increase significantly as will the active peak.
Approximate Word count = 1378
Approximate Pages = 5.5
(250 words per page double spaced)
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