Muscles During Gait Cycle

Question 1

What Trunk muscles are active at Initial Contact?

Answer 1

Back extensors isometrically to stabilize

Question 2

What Hip muscles are active at Initial Contact?

Answer 2

Glute Max / Adductor Magnus active. Hamstrings (SM, ST, BFLH) less active

Question 3

What Knee Muscles are active at Initial Contact?

Answer 3

Quads (all Vastii) active to prep for LR. Hamstrings working eccentrically

Question 4

What Ankle Muscles are active at initial contact?

Answer 4

so. Dorsiflexor to maintain neutral position

Question 5

What Hip muscles are active at Loading Response?

Answer 5

glutes active to decelerate thigh, abductors (glute med, upper fibers of glute max) iso/ecc to stabilize pelvic drop

Question 6

What Knee Muscles are active at Loading Response?

Answer 6

peak ecc quad activity for shock absorption
decrease in hamstring activity

Question 7

What Ankle Muscles are active at Loading Response?

Answer 7

peak eccentric dorsiflexor response, then concentrically for the second half of LR to draw tibia forward.
Gastroc/soleus active in late LR

Question 8

What Hip muscles are active at Mid-Stance?

Answer 8

stabilized by abductors (glute med/min / Ant. TFL).
Vastii contributes to knee extension, hip extends 2° to hamstring tension, then they extend actively until GRFV is past the joint.

Question 9

What Knee Muscles are active at Mid-Stance?

Answer 9

quads providing knee stability early on, late midstance they go quiet due to passive extension torque

Question 10

What Ankle Muscles are active at Mid-Stance?

Answer 10

soleus first, then gastroc to eccentrically control the forward progression of tibia

Question 11

What Hip muscles are active at Terminal Stance?

Answer 11

Ant. TFL and adductor longus limits hyperextension and stabilize pelvis. abductors decrease

Question 12

What Knee Muscles are active at Terminal Stance?

Answer 12

post. muscles limit knee hyperextension then initiates flexion as heel rises

Question 13

What Ankle Muscles are active at Terminal Stance?

Answer 13

peak eccentric PF, counters DF torque 2° BW, prevents ant. tibial collapse. heel rises through forefoot rocker

Question 14

What Hip muscles are active at Pre-Swing?

Answer 14

PF recoil leads to thigh advancement assisted by adductor longus, gracilis, rec fem all concentrically

Question 15

What Knee Muscles are active at Pre-Swing?

Answer 15

rec fem restrains rapid passive knee flexion at fast speeds but otherwise quiet. flexors quietly come on at end of preswing

Question 16

What Ankle Muscles are active at Pre-Swing?

Answer 16

residual PF activation due to recoil of achilles. Conc. DF at end of PSw to decel. PF and prepare to lift foot

Question 17

What Hip muscles are active at Initial Swing?

Answer 17

iliacus flexion, gracilis and sartorius work synergistically with hip flexion and knee flexion.

Question 18

What Knee Muscles are active at Initial Swing?

Answer 18

rapid flexion by BFSH, sartorius, and gracilis

Question 19

What Ankle Muscles are active at Initial Swing?

Answer 19

dorsiflexors to clear toes

Question 20

What Hip muscles are active at Mid-Swing?

Answer 20

minimal or no hip flexors

Question 21

What Knee Muscles are active at Mid-Swing?

Answer 21

hamstrings, BFLH / semi-mem specifically

Question 22

What Ankle Muscles are active at Mid-Swing?

Answer 22

isometric dorsiflexors to maintain 0° for clearance

Question 23

What Hip muscles are active at Terminal Swing?

Answer 23

peak hamstring eccentric deceleration hip flexion/stabilization of hip. glute med prepares to counter adduction of hip flexors, prepared for IC.

Question 24

What Knee Muscles are active at Terminal Swing?

Answer 24

hamstrings peak to decelerate knee ext. Quads conc. active to ensure knee ext. All Vastii are on to prepare knee for high ms demands of abrupt drop of BW

Question 25

What Ankle Muscles are active at Terminal Swing?

Answer 25

active isometric dorsiflexors

Question 26

What Trunk muscles are active at Loading Response?

Answer 26

erector spinae & deep extensors iso/ecc

Question 27

What Trunk muscles are active at Terminal Stance?

Answer 27

Rect. Abd concen.
less obliques

Question 28

What Trunk muscles are active at Pre Swing

Answer 28

ipsilateral erector spinae active for contralat. limb
**transfer of HAT

Question 29

What Trunk muscles are active at terminal swing

Answer 29

rect. abd concent.
less obliques

Question 29

What Trunk muscles are active at mid swing?

Answer 29

rect. abd concent.
less obliques