Muscle Activity in Gait Flashcards

1
Q

key roles of hip extensors

A

activated in terminal swing prior to initial contact to initiate hip ext and prepare LE for weight acceptance at the beginning of stance

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2
Q

key role of hip flexors

A

advance LE forward during initial swing and lift LE to allow for toe clearance during swing

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3
Q

key role of hip abductors

A

control the slight lowering of the contralateral pelvis on the side of the swing limb then provide pelvic stability in stance

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4
Q

key role of hip adductors

A

assist with initiation of hip flexion after toe off

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5
Q

key role of knee extensors

A

eccentrically control knee flexion in loading response then act concentrically to extend the knee and support body in midstance

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6
Q

key role of knee flexors

A

decelerate knee extension in preparation for placement of the foot on the ground

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7
Q

key role of ankle DF

A

eccentric activation to control PF of the ankle at initial contact until foot comes in contact with the ground

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8
Q

key role of ankle PF

A

eccentric contraction moving into midstance to control tibial advancement

concentric contraction at terminal stance to propel forward

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9
Q

key role of ankle invertors

A

eccentrically contract to control pronation until midstance then concentrically contracts to supinate the foot for push off in terminal stance/preswing

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10
Q

key role of ankle evertors

A

active as co-contraction to counter strong inversion effect occurring during loading response to midstance

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11
Q

foot force

A

force applied to the ground by the foot

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12
Q

ground reaction force

A

force applied to the foot by the ground

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13
Q

center of pressure

A

point where all the floor-foot forces act

come together - change as you’re walking

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14
Q

muscle activation in the sagittal plane during initial contact: hip

A

hip: extensors contract concentrically

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15
Q

muscle activation in the sagittal plane during initial contact: knee

A

knee: eccentric flexor contraction to counteract extension torque

extensors transition from concentric to eccentric contraction in preparation for loading response

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16
Q

muscle activation in the sagittal plane during initial contact: ankle

A

ankle: DF contract concentrically

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17
Q

muscle activation in the sagittal plane during loading response: hip

A

concentric contraction of extensors

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18
Q

muscle activation in the sagittal plane during loading response: knee

A

eccentric contraction of knee extensors

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19
Q

muscle activation in the sagittal plane during loading response: ankle

A

eccentric contraction of DF –> transition to eccentric contraction of ankle PF in late LR

20
Q

muscle activation in the sagittal plane during mid stance: hip

A

little hip activity

21
Q

muscle activation in the sagittal plane during mid stance: knee

A

eccentric contraction of knee extensors in beginning of mid stance with transition to concentric contraction of knee extensors by the end of mid stance phase

22
Q

muscle activation in the sagittal plane during mid stance: ankle

A

eccentric contraction of ankle PF

23
Q

muscle activation in the sagittal plane during terminal stance: hip

A

minimal activity

some activation of anterior fiber of TFL to possible restrain hyperextension of the hip

24
Q

muscle activation in the sagittal plane during terminal stance: knee

A

no knee extensor activity

tibial position maintained by gastroc

25
muscle activation in the sagittal plane during terminal stance: ankle
concentric contraction of ankle PF to prevent tibial collapse with heel rise
26
muscle activation in the sagittal plane during pre-swing: hip
concentric contraction of hip flexors
27
muscle activation in the sagittal plane during pre-swing: knee
flexion is mainly passive | minimal concentric contraction of knee flexors
28
muscle activation in the sagittal plane during pre-swing: ankle
ankle PF activity ceases in early preswing and passive tension contributes to ankle moving into PF ankle DF concentric contraction initiated at the end of pre swing phase
29
muscle activation in the sagittal plane during initial swing: hip
continued concentric contraction of hip flexors
30
muscle activation in the sagittal plane during initial swing: knee
concentric contraction of knee flexors | flexion continues to be aided by flexion at the hip
31
muscle activation in the sagittal plane during initial swing: ankle
concentric contraction of ankle DF
32
muscle activation in the sagittal plane during mid swing: hip
continued concentric contraction of hip flexors | initiation of eccentric hip extensors to control hip flexion
33
muscle activation in the sagittal plane during mid swing: knee
knee extension created by momentum | knee flexors contract eccentrically at the end of the mid swing phase to control extension
34
muscle activation in the sagittal plane during mid swing: ankle
continued concentric contraction of DF
35
muscle activation in the sagittal plane during terminal swing: hip
concentric contraction of hip extensors
36
muscle activation in the sagittal plane during terminal swing: knee
concentric contraction of knee extensors to insure full extension peak knee flexor eccentric contraction to decelerate thigh
37
muscle activation in the sagittal plane during terminal swing: ankle
continued concentric contraction of DF
38
muscle activation in the frontal plane during loading response: hip
abductors contract eccentrically
39
muscle activation in the frontal plane during loading response: ankle
invertors contract eccentrically
40
muscle activation in the frontal plane during midstance: hip
abductors contract eccentrically then concentrically
41
muscle activation in the frontal plane during midstance: ankle
invertors contract eccentrically
42
muscle activation in the frontal plane during terminal stance and pre swing: hip
abductors contract concentrically
43
muscle activation in the frontal plane during terminal stance and pre swing: ankle
invertors contract concentrically
44
muscle activation in the frontal plane during initial, mid and terminal swing: hip
adductor contract concentrically
45
muscle activation in the frontal plane during initial, mid, terminal swing: ankle
evertors contract concentrically