Gait analysis - L16-17

Question 1

what is CoP also

Answer 1

centre of pressure and location of the force average force vector.

Question 2

two gait objectives

Answer 2

1) propel our bodies forward.
2) to do so effectively, requiring minimal energy expenditure

Question 3

what is happeing in the heel strike to first peak in the vertical force componenet

Answer 3

CoM lowers, but F1 should be in order of 1.2 times the persons body weight. Fmg + Fg > BW

Question 4

first peak (F1) to trough (F2) in the vertical force component.

Answer 4

CoM increases again. F2 in the order of 0.7 times the persons body weight. Fp - Fg < BW

Question 5

F2 to second peak (F3) in vertical force component.

Answer 5

CoM lowers again. and our F3 force should be 1.2 times the persons body weight. Fmg + Fg > BW

Question 6

F3 to Toe off in the vertical componenet

Answer 6

the foot unloads and goes onto the other foot. the time it takes to unload the back foot is shown on the graph. the longer the offloading periods the lower the first peak during loading on the front foot.

Question 7

GRF

Answer 7

the measured action-reaction force of our push against the ground.

Question 8

heel strike to posterior peak (F4) in the anterior-posterior force component.

Answer 8

breaking force. after the intial claw back (if there is one) the heel is in contact with the ground and the body decelerates causing a posterior shear force. F4 is 0.2 times the persons body weight.

Question 9

F4 to crossover in anterior - posterior force component

Answer 9

the body begins to move over the stance limb. at the crossover point the horizontal force is zero.

Question 10

when should the crossover occur ?

Answer 10

at around 55% of the stance phase

Question 11

crossover to anterior peak (F5)

Answer 11

propulsion force. the heel lifts and the foot is pushed down and back into the ground by the action of muscles in the posterior region of the ankle. this has the effect of producing an anterior component of the ground reaction force, which propels the body forward. F5 should be 0.2 body weight.

Question 12

anterior peak to toe off

Answer 12

this is now the period of terminal double support, where the force is now being transferred to the front foot and the anterior force, therefore, reduces.

Question 13

what are Pedotti diagrams

Answer 13

a way to show the vertical and anterior-posterior forces.

Question 14

mediolateral force graph.

Answer 14

draw and look at lecture