Muscles During Gait Cycle Flashcards
What Trunk muscles are active at Initial Contact?
Back extensors isometrically to stabilize
What Hip muscles are active at Initial Contact?
Glute Max / Adductor Magnus active. Hamstrings (SM, ST, BFLH) less active
What Knee Muscles are active at Initial Contact?
Quads (all Vastii) active to prep for LR. Hamstrings working eccentrically
What Ankle Muscles are active at initial contact?
so. Dorsiflexor to maintain neutral position
What Hip muscles are active at Loading Response?
glutes active to decelerate thigh, abductors (glute med, upper fibers of glute max) iso/ecc to stabilize pelvic drop
What Knee Muscles are active at Loading Response?
peak ecc quad activity for shock absorption
decrease in hamstring activity
What Ankle Muscles are active at Loading Response?
peak eccentric dorsiflexor response, then concentrically for the second half of LR to draw tibia forward.
Gastroc/soleus active in late LR
What Hip muscles are active at Mid-Stance?
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.
What Knee Muscles are active at Mid-Stance?
quads providing knee stability early on, late midstance they go quiet due to passive extension torque
What Ankle Muscles are active at Mid-Stance?
soleus first, then gastroc to eccentrically control the forward progression of tibia
What Hip muscles are active at Terminal Stance?
Ant. TFL and adductor longus limits hyperextension and stabilize pelvis. abductors decrease
What Knee Muscles are active at Terminal Stance?
post. muscles limit knee hyperextension then initiates flexion as heel rises
What Ankle Muscles are active at Terminal Stance?
peak eccentric PF, counters DF torque 2° BW, prevents ant. tibial collapse. heel rises through forefoot rocker
What Hip muscles are active at Pre-Swing?
PF recoil leads to thigh advancement assisted by adductor longus, gracilis, rec fem all concentrically
What Knee Muscles are active at Pre-Swing?
rec fem restrains rapid passive knee flexion at fast speeds but otherwise quiet. flexors quietly come on at end of preswing
What Ankle Muscles are active at Pre-Swing?
residual PF activation due to recoil of achilles. Conc. DF at end of PSw to decel. PF and prepare to lift foot
What Hip muscles are active at Initial Swing?
iliacus flexion, gracilis and sartorius work synergistically with hip flexion and knee flexion.
What Knee Muscles are active at Initial Swing?
rapid flexion by BFSH, sartorius, and gracilis
What Ankle Muscles are active at Initial Swing?
dorsiflexors to clear toes
What Hip muscles are active at Mid-Swing?
minimal or no hip flexors
What Knee Muscles are active at Mid-Swing?
hamstrings, BFLH / semi-mem specifically
What Ankle Muscles are active at Mid-Swing?
isometric dorsiflexors to maintain 0° for clearance
What Hip muscles are active at Terminal Swing?
peak hamstring eccentric deceleration hip flexion/stabilization of hip. glute med prepares to counter adduction of hip flexors, prepared for IC.
What Knee Muscles are active at Terminal Swing?
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
