Gait - Muscle Activation

In sagittal plane of IC-LR, what is Erector Spinae doing?

Control foward momentum of trunk (keeping you from throwing your trunk forward)

In sagittal plane of IC-LR, what is Glute Max doing?

Prevent forward trunk flexion over the hip

In sagittal plane of IC-LR, what is Glute Med/Glut Min/TFL doing? What kind of contraction is happening?

Controls the rate at which the contralateral pelvis drops (hip adduction) ; eccentric

In sagittal plane of IC-LR, what is Adductor Longus and Adductor Magnus doing?

Stabilizes hip and helps with hip extension (when hip is flexed)

In sagittal plane of IC-LR, what are the quads doing? What kind of contraction is happening?

Cushion the rate of weight acceptance (absorb force) ; eccentric

In sagittal plane of IC-LR, what are the hamstrings doing?

Assist with hip extension and stabilizes the knee

In sagittal plane of IC-LR, what are the pre-tibial muscles (dorsiflexors) doing? What kind of contraction is happening?

Control foot to floor ; eccentric

In sagittal plane of IC-LR, what are the posterior tibialis muscles (plantarflexors) doing? What kind of contraction is happening?

Control arch down to floor (decelerates pronation) ; eccentric

In sagittal plane of midstance, what is the Glute Max doing? What kind of contraction is happening?

starting to extend hip ; initially concentric

In sagittal plane of midstance, what is Glute Med/Glute Min/TFL doing? What kind of contraction is happening?

Early in midstance, still ADducted ; eccentric

2nd half of midstance, ABducting ; concentric

In sagittal plane of midstance, what are the quads doing? What kind of contraction is happening?

extend the knee ; concentric

In sagittal plane of midstance, what are the pre-tibial muscles (early) doing?

DF early, then being quiet

In sagittal plane of midstance, what are the gastroc/soleus doing? What kind of contraction is happening?

Control rate of DF ; eccentric

In sagittal plane of midstance, what is posterior tibialis doing? What kind of contraction is happening?

Control the rate of pronation (eversion) (because posterior tibialis is an invertor) ; eccentric

In sagittal plane of midstance, what are fibularis longus/brevis doing?

Hold first ray to ground & counteracts strong inversion effect to deep posterior muscles

In sagittal plane of midstance, what is FDL doing?

Assists with other plantarflexor muscles with controlling rate of DF

In sagittal plane of midstance, what are the foot intrinsics doing? What kind of contraction is happening?

stabilize the forefoot and control the arch ; eccentric

In sagittal plane of midstance, what is Rectus Abdominus doing? What kind of contraction is happening?

Stabilizes pelvis later in midstance ; isometric

In sagittal plane of terminal stance, what is Glut Med, Glut Min, and TFL doing?

ABduct hip; anterior fibers may be active to help with IR (forward contralateral rotation of pelvis)

In sagittal plane of terminal stance, what are Gastroc/soleus doing? What kind of contraction is happening?

Plantarflexing ; concentric

In sagittal plane of terminal stance, what is Posterior tibialis doing? What kind of contraction is happening?

Supinates the foot (inverting and raising the foot) ; concentric

In sagittal plane of terminal stance, what is Fibularis Longus/ Fibularis Brevis doing?

Keeps 1st ray on the ground

In sagittal plane of terminal stance, what are foot intrinsics doing?

Stabilize the forefoot and raise the arch

In sagittal plane of preswing, what is Iliopsoas doing? What kind of contraction is happening?

Hip flexion ; concentric

In sagittal plane of preswing, what is Sartorius doing?

Hip flexion

In sagittal plane of preswing, what is Adductor Longus / Adductor Brevis doing?

Hip flexion

In sagittal plane of preswing, what is Rectus Femoris doing?

Hip flexion and controlling knee flexion

In sagittal plane of preswing, what are pre-tibial muscles doing? What kind of contraction is happening?

DF ankle and extends toes to clear foot ; concentric

In sagittal plane of preswing, what is Rectus Abdominis doing?

Active to keep trunk stable because of anterior pelvic tilt with hip flexion

In sagittal plane of Midswing , what are the hamstrings doing? What kind of contraction is happening?

Slow down hip flexion and knee extension ; eccentric

In sagittal plane of Midswing, what are pre-tibial muscles doing?

DF ankle to keep foot off ground

In sagittal plane of terminal swing, what is Glute Max doing? What kind of contraction is happening?

Decelerate the flexing hip and begin to extend ; concentric

In sagittal plane of terminal swing, what is Glute Med doing?

Prepare for heel contact

(turns on a little early because it knows it will soon generate lots of force)

In sagittal plane of terminal swing, what are the hamstrings doing?

Control last bit of knee extension to prepare leg to go on ground

In sagittal plane of terminal swing, what are pre-tibial muscles doing?

DF ankle (hold stable) to clear the foot