Running Gait (CoM and Muscles)

Question 1

Running gait total vertical displacement

Answer 1

5-10cm

Question 2

Minimum height of CoM during running

Answer 2

mid stance

Question 3

Maximum height of CoM during running

Answer 3

middle of float in early swing

Question 4

Total side to side displacement in running

Answer 4

near 0cm

Question 5

Erector Spinae

Answer 5

IC of both limbs
control forward angular momentum of trunk relative to pelvis

Question 6

Rectus abdominus

Answer 6

control and stabilize trunk motion in horizontal plane
Support abdominal viscera

Question 7

Glute Max Peak activity

Answer 7

loading response

Question 8

Glute max following IC into mid stance

Answer 8

eccentric following IC and concentric until mid stance

Question 9

When is glute max inactive

Answer 9

remainder of stance and early swing

Question 10

Magnitude of which muscle group increases with running speed?

Answer 10

Hip extensors

Question 11

Hamstrings peak activity

Answer 11

Peak activity last part of swing to decelerate hip flexion and knee extension
active from 70-90%

Question 12

Iliopsoas through toe off

Answer 12

eccentric

Question 13

Iliopsoas after toe off and early swing

Answer 13

concentric

Question 14

Rectus femoris and sartorius assist with hip flexion during:

Answer 14

early swing

Question 15

Glute med during loading response

Answer 15

eccentric

Question 16

glute med remainder of stance

Answer 16

concentric

Question 17

glute med inactive

Answer 17

last part of stance and through swing

Question 18

Adductor magnus

Answer 18

Peak activity near mid stance to assist with hip extension

Question 19

Adductor longus

Answer 19

peak activity during early swing to initiate hip flexion

Question 20

Quadratus femoris

Answer 20

Active during stance phase and late swing
Acts eccentrically to control hip IR and provide stability

Question 21

Knee Extensors

Answer 21

Most active during loading response (eccentric)

Question 22

Rectus femoris activity

Answer 22

early swing to aid in hip flexion

Question 23

Tibialis Anterior

Answer 23

Active after IC to control PF
Most active during swing

Question 24

Gastroc and soleus

Answer 24

peak eccentric near mid stance
concentric mid stance to toe off

Question 25

Tibialis Posterior

Answer 25

Active in entire stance phase to control eversion Concentric during mid stance to toe off

Question 26

Fibularis ms.

Answer 26

Peak activity near 15% Work with TP in early stance to provide ML stability to subtalar joint