L9 Gait Kinematics

Question 1

3 methods of gait measurement

Answer 1

1. Kinetics - int/ext forces
2. Kinematics - gait phases, ROM, muscle activity
3. spatial/temporal - velocity, step length

Question 2

Zeno Mat

Answer 2

mat you walk on
spatial temporal output
kinematics
visual video of foot prints

Question 3

3D motion capture

Answer 3

measure kinematics
position
velocity
acceleration

Question 4

three components/forces measured in kinetics

Answer 4

ground reaction force
moments
power

Question 5

GRF

Answer 5

external force acting on the body
equal/opposite force to ground and body

Question 6

moment

Answer 6

force causing rotation around the joint
internal and external moments

Question 7

power

Answer 7

force x time
watts

Question 8

internal moment

Answer 8

created by muscle contraction, restraint from ligaments, joint capsule elastic properties

Question 9

external moments

Answer 9

created by GRF/landing surface

Question 10

What function do extensor moments provide in gait? What muscle groups?

Answer 10

they support body on surface
quads, PF gastroc/soleus

Question 11

What function do flexor moments provide in gait? What muscle groups?

Answer 11

pull away from surface
iliopsoas
quads

Question 12

What phases of gait have external moments

Answer 12

only when limb is in contact with ground can it have GRF generating ext moment
stance phases

Question 13

What motion absorbs power?

Answer 13

eccentric contraction

Question 14

What motion creates power?

Answer 14

concentric contraction

Question 15

Power analysis graph: negative and positive

Answer 15

negative is absorbing power - eccentric contraction
positive is generating power - concentric contraction

Question 16

planar flexor power implications in gait

Answer 16

important for “push off” energy to propel forward

Question 17

hip flexor power implications in gait

Answer 17

propulsive force in pull off