PHTY100 Lecture Notes - Lecture 12: List Of Flexors Of The Human Body, Ground Reaction Force, Anatomical Terms Of Motion
ANAT week 12 LB Gait 2
Ankle: plantargrade plantarflexion dorsiflexion (some as we move forward) rapid sharp
plantar flexion (as we start to push off – propulsion phase) dorsiflexion plantargrade
Stance Phase
Initial Contact (used to be known as heel strike)
Aim of subphase: position limb for stance phase
- Knee is in slight flexion which is the ideal
position for shock absorption
- Hip is in flexion but is commencing extension
to bring body weight forward over leg to
prepare for stance phase
- Eccentric contraction of knee extensors are
controlling the rate of knee flexion
- ECCENTRIC WHEN CONTROLLING RATE THAT
LIMB MOVES, CONCENTRIC WHEN LIMB JUST
FALLS INTO MOVEMENT
- Black dots show centre axis
- Black line = ground reaction force (will do next
semester)
Load Response
find more resources at oneclass.com
find more resources at oneclass.com
AIM: shock absorption, weight acceptance
- Now shock-absorbing through knee eccentric contraction to
prevent knee collapse
- Eccentric contraction of ankle to stop foot slap
Midstance
AIM: stability, progression over foot
- Begins at end of load response
- Period of control momentum is carrying us forward
but we want control
- Hip abductors (glute min + med + TFL) to prevent pelvic
tilt
- Knee extensors are now concentrically contracting
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Ankle: plantargrade plantarflexion dorsiflexion (some as we move forward) rapid sharp plantar flexion (as we start to push off propulsion phase) dorsiflexion plantargrade. Initial contact (used to be known as heel strike) Aim of subphase: position limb for stance phase. Knee is in slight flexion which is the ideal position for shock absorption. Hip is in flexion but is commencing extension to bring body weight forward over leg to prepare for stance phase. Eccentric contraction of knee extensors are controlling the rate of knee flexion. Black line = ground reaction force (will do next semester) Now shock-absorbing through knee eccentric contraction to prevent knee collapse. Eccentric contraction of ankle to stop foot slap. Period of control momentum is carrying us forward but we want control. Hip abductors (glute min + med + tfl) to prevent pelvic tilt. Hip flexors control momentum as body weight comes forward (stopping too rapid hip extension) Knee extensors = quads prevent knee from collapsing forwards.
