LECTURE 4 RUNNING BIOMECHANICS Flashcards
BASE OF GAIT NARROWS, straight line progression. Results in a RF that is
more varus to the ground
Runner’s varus
Moderate jogging in a functional varus at the corner of a track will causes?
pathology bc the
pelvis shifts laterally over the stace limb, which creates an increase in STJ pronation and valgus
knee stress
center of gravity for running?
lower center of gravity
contact progression for walk, jog, moderate, fast, sprint?
- Walk- HC-> FF-> HO-> TO
- Jog- HC-> FF-> HO-> TO
- Mod- HC(midfoot strike)FF-> HO-> TO
- Fast-FF-> HC-> HO-> TO
- Sprint FF->TO
in mid foot strikers what muscle absorbs shock?
TRICEPS SURAE ABSORB SHOCK, BUT THIS INCREASES THE
TENSILE LOAD ON THE ACHILLES TENDON
these are less in MF strikers, what is the effect?
GRF’s are less in MF strikers->decrease STJ pronation->increase mm work->O2 consumption
these are less in MF strikers, what is the effect?
GRF’s are less in MF strikers->decrease STJ pronation->increase mm work->O2 consumption
what are the two peaks in GRFs?
walking and running
percent of time in running? in what float?
what percent is spent on stance?
60%, double float
40%
speed is equal too?
STRIDE LENGTH X STRIDES/MINUTE
jogging affects stance and swing how?
sprinting?
STANCE > SWING
stance
At foot strike horizontal velocity equals?
0 and tibia is slightly posterior
In take off, the MTJ importance is related to STJ how?
greater
as speed increases, what happens to stance and swing time?
STANCE TIME DECREASES AND SWING TIME INCREASES PROPORTIONALLY
whats under stride?
excess KNEE flexion AT GROUND CONTACT leads to INCREASED PATELLAR
STRAIN and excess sagittal plane stress
