Gait analysis. Katayoon yadollahi 8433084 Relevant instructor: Dr.Razjouian. Abstract. Gait analysis offers a unique means to measure the mechanical factors of joint loading, orientation, and neuromuscular function during activities of daily living such as walking.
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Here, the force is tilted over forwards, causing a forwards acceleration on the body, speeding it up into the swing phase. Notice that the ground reaction force is not completely horizontal - it\'s tail is still in the air, so there must still be some vertical, load force. In fact, it\'s very rare to have only a vertical or a horizontal force on the body - usually they both act together as what\'s known as a ground reaction vector (GRV). We can see how much of each is present at any time by drawing a triangle:
The size of the friction force is represented by the length of the horizontal line (base of the triangle), while the size of the load force is indicated by the length of the vertical line (height of the triangle). The hypotenuse of the triangle is known as the resultant force.
We can see that the vector swings round from backwards at heel-strike, vertically during the middle of stance, then forwards at toe-off. Notice that it\'s height changes, too. It\'s very small at heel-strike, rises to a maximum soon afterwards, then falls a little during the middle of stance, rises again, then falls before toe-off. This must mean that the vertical reaction force on the body also shows this pattern:
The friction force, as we saw, acts backwards (negative) after heel-strike and forwards (positive) towards toe-off. It changes at some time during the middle of stance - about 36% of the cycle. Notice the scale on the vertical (y) axis.
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