Running Flashcards
Walking has two periods of double __________ during ________ phase
- double-support
- stance phase
Both feet are in contact with the ground
Running gives way to two periods of double _______ at the beginning and end of _______ phase of running gait
- double float
- swing phase of running gait
Here neither foot is in contact with the ground
stance phase in running is about how long?
300ms - not in contact with the ground very much
stance phase in running is what percentage of gait
35-40% (can be 22% in world class sprinters)
Are there any periods where both feet are in contact with the ground in running?
NO
Float phase
when speed of running increases, what happens to time spent in stance
it decreases
Increased time in swing phase
Absorption period of running
once foot contacts the ground, the body COM decelerates horizontally to absorb energy
Propulsion (generation) phase of running
after mid-stance, body COM is propelled upward and forward
stance limb is forcefully driven into swing phase after toe- off
what allows you to maintain momentum in walking?
the ballistic concentric contraction from hip flexors
what allows you to maintain momentum in running?
propulsion phase
In the running gait cycle, 70% of the time is spent in
swing phase
when does double float occur?
at the beginning and end of swing phase in running
4 phases of running are:
- absorption
- propulsion
- initial swing
- terminal swing
at initial contact in running, the hip and knee should be angled to what degree?
Hip: 15-25 degrees flexion
Knee: 10-20 degrees flexion
during midstance what are the kinematics of the LE
Hip: flexed to 35-45 degrees
Knee: flexed to 35-40 degrees
Ankle: 20- 30 degrees DF
During toe off, what are the kinematics of the LE?
hip extension: 5-15 degrees
Knee flexion: 0-10 degrees
Ankle: 10-20 degrees PF
Kinematics of swing limb during first double float?
hip extension 5-15 degrees
knee flexion 0 - 5 degrees
Ankle 20-25 degrees PF
Kinematics of swing limb during mid swing in running
Hip: flexed 35-45 degrees
Knee: flexed 80-115 degrees
Ankle: 0-5 DF
Kinematics of swing limb during second double float
Hip flex: 15-25 degrees
Knee Flex: 5-15 degrees
Ankle: 0-5 DF
with running do you have an increased or decreased BOS?
Decreased
T/F: in running there is an increased functional varus of the stance leg
true
In running, the pattern of GRF is dependent on…
strike pattern
Vertical ground reaction force is ______ x BW
2-3x BW
how can you tell if someone is a rearfoot striker on a force diagram?
if there is a small hump before the larger one (indicates an absorption of force with initial strike)
