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The aim of the experiment using the 3 point reaction board, is to be able to work out the where the centre of gravity is on a subject during a physical activity.

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Introduction

3 POINT REACTION BOARD

Introduction:

The aim of the experiment using the 3 point reaction board, is to be able to work out the where the centre of gravity is on a subject during a physical activity. The 3 point reaction board is quite accurate as it works out the position of the centre of gravity from two dimensions. This type of analysis as Hay describes ‘has been become of significant use in many years, due to being able to find the centre of gravity during an activity and enhancing the ability to analyse sporting techniques’(1993). There has been many different methods used to try and find the centre of gravity although the 3 point reaction bard has proved to be one of the best. It is accurate, but can still only give an estimate as the centre of gravity changes for every breath or slight movement made, although it does allow an indication.

There is a method called the reaction board, which is the simplest.

...read more.

Middle

1 33.5,         R 2          74         62

CB        =        Y        Scales         A        R 1 22,5,        R  2        41        53

Position 1

χ        =        ( 74        -        33.5 )        2.01        =        1.02m

                        80

γ        =        ( 41        -        22.5 )        2.01        =        0.46m

                        80

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Conclusion

This is where the centre of gravity is on majority of people, but when the position of the body changes so does the centre of gravity. Being able to find the centre of gravity during many different positions can be very useful. When a subject carries out a long jump the centre of gravity changes depending on the position of the body.

Fig. 1

If the subject were to transform the position of the body in the air the subject would be able to continue to travel further in the air. This due to the findings of the experiment that being able to transform into a sitting position in the air the centre of gravity moves to the front of the body or even out side of the body to cause forward momentum.

Fig. 2

Reference List:

  • Hay, J (1993) The Biomechanics of Sports Techniques. Prentice-Hall Inc. New Jersey.
  • Hochmuth, G. (1984) Biomechanics of Athletics Movement. Sportverlag, Berlin.

...read more.

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