Lecture 22 Flashcards
Peak vertical ground reaction force is
120% of body weight
Peak anterior posterior ground reaction force is
20% of body weight
Peak medial lateral ground reaction force is
5% of body weight
The location of the GRF relative to a specific joint will…
Dictate what type of external moment is created at that joint at a specific time in gait cycle
What is the external moment (torque) at the:
Ankle
Plantar flexion moment
What is the external moment (torque) at the:
Knee
Flexion moment
What is the external moment (torque) at the:
Hip
Flexion moment
What is involved in a running gait cycle
Stance phase (35 - 40% of GC)
Swing phase
Steps for Stance phase (running) are
Initial contact
Foot flat
Heel raise
Toe off
The mid stance phase is when…
The foot is flat
The terminal stance phase is
When the heel off and toe off
Steps for swing phase (running)
Toe off
Initial swing
Mid swing
Terminal swing
Walking vs running:
Both are…
Speed dependent movement
Stance phase drops (60% to 35%)
Shorter gait cycle and lower percentage of stance phase
Running has higher ankle, knee and hip joint ROM
Walking vs running:
Walk to run
Stance phase drops (60% to 35%)
Walking vs running:
Faster running speed
Shorter gait cycle and lower percentage of stance phase
Walking vs running:
Joint angle range of motion
Running has higher ankle, knee and hip joint ROM
Walking vs running
Foot strike pattern
Walking: Rearfoot strike
Running: Rearfoot stroke, forefoot strike, midfoot strike
Rearfoot strike is used by…
Greatest % among runners
Rearfoot strike vs Forefoot strike
Rearfoot displays a distinct impact transient in early stance
Forefoot has no impact transient in early stance
Active peak vertical forces near mid stance are generally similar
Strike pattern and injury
High vertical loading rates in Rearfoot strike pattern lead to injury (stress fractures)
Forefoot strike running is a lower injury risk
