Muscle Activity During Gait

Question 1

Initial Contact

Answer 1

Ankle DF’ors
Quadriceps
HS to stabilize
Hip extensors and abductors

Question 2

Loading Response

Answer 2

Ankle DF’ors eccentrically
Quadriceps eccentrically
Tibialis Posterior eccentrically to control pronation
Quadriceps concentrically to pull femur over tibia
hip extensors concentrically

Question 3

MidStance

Answer 3

PF’ors eccentrically
Minimal knee muscles– Quads concentrically to continue to produce closed chain knee extension
Hip Abductors stabilize pelvis and prevent to contra. hip drop
Iliopsoas eccentrically to control hip extension

Question 4

Terminal Stance

Answer 4

PF’ors concentric
limited knee muscles
Hip abductors stabilize pelvis
iliopsoas: slow rate of hip ext

Question 5

Pre-Swing

Answer 5

PF’ors at peak activity
HS being to produce knee flexion
iliopsoas and other hip flexion switch to concentric

Question 6

Initial Swing

Answer 6

DF’ors concentrically
HS concentrically
Hip Flexors concentrically

Question 7

Mid Swing

Answer 7

Ankle DF’ors concentrically to clear foot
Knee and hip minimal d/t momentum

Question 8

Terminal Swing

Answer 8

Ankle DFors concentically
Ankle Invertors concentrically to supinate foot
Quads concentrically
HS Eccentric
Hip Extensors eccentric