Week 7: Gait Flashcards
Terminology
Gait cycle
Two phases
Period of time from when the heel strikes the ground to when the same heel strikes the ground again
Stance phase
Swing phase
Terminology
Stance phase
What percentage of the gait cycle does this phase take up?
total time foot is in contact with the floor
60%
Terminology
Swing phase
What percentage of the gait cycle does this phase take up?
total time foot is off the floor
40%
Terminology
Double support
Does double support occur while running?
period during stance phase when both feet are on the floor
No, weight is being transferred directly from one foot to the other.
Terminology
Single support
one foot is in contact with the floor
Terminology
What is the normal width for base of support (BOS)?
What is the normal degree of toe out?
- 2-4 inches
- 7°
Wider base = more stability
Terminology
Stride length
Distance between heel strike of one foot to heel strike of the same foot
shorter legs = shorter stride
Terminology
Step length
Distance between heel strike of one foot to heel strike of opposite foot
Terminology
Cadence
What else is it called?
Number of steps per minute
walking speed
normal cadence: 70-130 steps per minute
Terminology
What is the amount of lateral pelvic tilt during normal gait?
When does it occur?
<5°
toe off/pre-swing
Terminology
What is the amount of pelvic rotation during normal gait?
When does this occur?
swing leg 4° anteriorly
stance leg 4° posteriorly
swing phase
Terminology
What is the amount of vertical displacement during normal gait?
When does this occur?
2 inches
midstance
Terminology
What is the amount of horizontal displacement during normal gait?
When does the greatest amount of horizontal displacement occur?
2 inches
single support phase at midstance
What is the Rancho los Amigos term?
heel strike
initial contact
What is the Rancho los Amigos term?
foot flat
loading response
What is the Rancho los Amigos term?
midstance
midstance
What is the Rancho los Amigos term?
heel off
terminal stance
What is the Rancho los Amigos term?
toe off
pre-swing
What is the Rancho los Amigos term?
acceleration
initial swing
What is the Rancho los Amigos term?
midswing
midswing
What is the Rancho los Amigos term?
deceleration
terminal swing
Components of Gait Cycle
What is heel strike?
heel makes contact with the ground
Components of Gait Cycle
What is foot flat?
anterior tibialis works eccentrically to lower foot to the ground
Components of Gait Cycle
What is midstance?
entire foot in contact with the floor
body accelerating forward
Rancho los Amigos: foot flat to midstance
Components of Gait Cycle
What is initial contact?
first contact with the ground
Components of Gait Cycle
What is loading response?
initial contact until opposite foot is lifted for swing
heel strike to foot flat
Components of Gait Cycle
What is heel off?
heel lifts off the floor
Components of Gait Cycle
What is terminal stance?
begins with heel rise, continues until other foot strikes ground
midstance to heel off
Components of Gait Cycle
What is toe off?
toe lifts off floor
Components of Gait Cycle
What is pre-swing?
begins with initial contact of opposite limb, ends with ipsilateral toe
toe off
Components of Gait Cycle
What is acceleration?
toe off to midwing when swinging LE is directly under the body
Components of Gait Cycle
What is initial swing?
begins with foot lifting from floor, ends with swing foot opposite stance foot
toe off to acceleration
Components of Gait Cycle
What is midswing?
Traditional terminology & Rancho los Amigos
Traditional: LE passes directly under the body
RLA: acceleration to midswing - begins with swinging limb opposite stance leg and ends with swinging leg forward and tibia vertical
Components of Gait Cycle
What is deceleration?
tibia passes beyond perpendicular to the knee extending to prepare for heel strike
Components of Gait Cycle
What is terminal swing?
begins with tibia in vertical position and ends with foot striking the floor
midswing to deceleration
Which muscle groups are used?
Acceleration/initial swing
Concentric or eccentric?
What are the working muscles?
- hip flexors - concentric
- knee flexors - concentric
- ankle dorsiflexors - concentric
hip flexors: iliopsoas, rectus femoris
knee flexors: hamstrings
DF: anterior tib
Which muscle groups are used?
Midswing
Concentric or eccentric?
What are the working muscles?
(Hint: same as acceleration)
- hip flexors - concentric
- knee flexors - concentric
- ankle dorsiflexors - concentric
hip flexors: iliopsoas, rectus femoris
knee flexors: hamstrings
DF: anterior tib
Which muscle groups are being used?
deceleration/terminal swing
Concentric or eccentric?
What are the working muscles?
- knee extensors - concentric
- knee flexors - eccentric
- ankle dorsiflexors - concentric
knee extensors: quadriceps
knee flexors: hamstrings
DF: anterior tib
Which muscle groups are being used?
heel strike/initial contact
Concentric or eccentric?
What are the working muscles?
- knee extensors - eccentric
- ankle dorsiflexors - concentric
knee extensors: quadriceps
DF: ant tib
Which muscle groups are being used?
foot flat/loading response
Concentric or eccentric?
What are the working muscles?
- hip extensors - eccentric
- knee extensors - eccentric
- ankle dorsiflexors - eccentric
hip extensors: glute max
knee extensors: quadriceps
DF : ant tib
Which muscle groups are being used?
midstance
Concentric or eccentric?
What are the working muscles?
- knee extensors - concentric
- ankle plantarflexors - eccentric
knee extensors: quadriceps
(PF unspecified)
What muscles groups are being used?
heel off/terminal stance
Concentric or eccentric?
What are the working muscles?
ankle plantarflexors - concentric
What muscle groups are being used?
toe-off/pre-swing
Concentric or eccentric?
- hip flexors - concentric
- ankle plantarflexors - concentric