What is a linear or translatory motion produced by a series of rotary mvmts of the joints of the body?
What is a gait cycle?
initial heel contact of on LE to the next heel contact of the same extremity
What is the initial ground contact of one LE and continues until that LE is no longer in contact with the ground?
What occurs from the instant of toe off until heel strikes the gound (ground contact)?
What is double limb support?
when one limb is in the beginning of stance and the other is ending stance
occurs twice in a gait cycle
What is the distribution of time during the stance phase?
60% of the cycle
What is the distribution of time during the swing phase?
40% of the cycle
What is the distribution of time for double limb support?
What does RLA stand for?
rancho los amigos
In traditional gait, what is the sequence of the stance phase?
- heel strike
- foot flat
- heel off
- toe off
In traditional gait, what is the sequence of the swing phase?
- mid swing
In RLA, what is the stance phase of the gait cycle?
- initial contact
- loading response
- midstance (single limb support)
- terminal stance
In RLA, what is the swing phase of the gait cycle?
- initial swing
- mid swing
- terminal swing
What is the RLA loading response time frame?
from initial contact until the opposite extremity is off the ground
ends at foot flat, loading weight to other limb
What is the RLA terminal stance time frame?
end of midstance to initial contact of the opposite leg/heel
What isthe RLA time frame for pre-swing?
initial contact of opposite leg or heel to just before the toe leaves the ground
What is the RLA time frame of the inital swing?
begins when toe leaves the ground until maximum knee flexion occurs on the reference leg
toe off to knee flex
What is the RLA mid swing time frame?
from maximum knee flexion until tibia is vertical
What is the RLA terminal swing time frame?
from vertical tibia just prior to initial contact
What is the stance phase time of one leg during a gait cycle?
What is the time when one leg is supporting body weight during a gait cycle?
single support time
What is the amt of time that both feet are on the ground during the gait cycle?
double support time
as speed increases double support time decreases
What is the length the reference leg travels from heel strike to heel strike?
distance traveled during one gait cycle
What is the time required to perform on stride length?
What is the distance between 2 successive points of contact of opposite extremities (right heel strike to left heel strike)?
What is the time spent during a single step?
on a weak or painful leg, the step duration may decrease
What is cadence?
- number of steps per unit of time
- shorter steps will increase cadence at any velocity
- increased cadence will decrease double support time
- slow walking = 70/min
- fast walking = 130/min
What is the rate of change of velocity with respect to time?
What is the width of BOS?
from mid heel to mid heel
How many degrees of tow out is normal?
What provides counterbalance while walking?
What is a painful gait called, and what causes it?
weakness, inflammation, injury, joint deformities
What is vertical displacement of COG?
lowest point of the COG during one gait cycle is during double support
highest point occurs at midstance
normal displacement is 2 inches
What is lateral displacement of COG?
horizontal displacement of COG as body weight shifts from side to side
greatest during the single-support phase of gait at midstance
What is the horizontal dip of the pelvis?
- lateral pelvic tilt
- pelvic drops slightly on the NWB side during swing phase
What muscles work to help keep the pelvic level?
hip abductors contract on the opposite side and erector spinae contracts on the same side
What degree of knee flexion during the stance phase is normal?