Ja. Nyland et al., THE EFFECT OF QUADRICEPS FEMORIS, HAMSTRING, AND PLACEBO ECCENTRIC FATIGUE ON KNEE AND ANKLE DYNAMICS DURING CROSSOVER CUTTING, The Journal of orthopaedic and sports physical therapy, 25(3), 1997, pp. 171-184
This study attempted to determine the effect oi eccentric quadriceps f
emoris, hamstring, and placebo fatigue on stance limb dynamics during
the plant-and-cut phase of a crossover cut Twenty female college stude
nts (task trained were tested. Hamstring fatigue resulted in decreased
peak impact knee flexion moments (p less than or equal to .01), incre
ased internal tibial rotation at peak knee flexion (p less than or equ
al to 05), and decreased peak ankle dorisflexion (p less than or equal
to .05). Quadriceps fatigue resulted in increased peak ankle dorsifle
xion moments (p < .01), decreased peak posterior braking forces (p les
s than or equal to 01), decreased peak knee extension moments (p less
than or equal to .01), delayed peak knee flexion (p less than or equal
to .01), delayed peak propulsive forces (p < .01), and delayed subtal
ar peak inversion moments (p less than or equal to .05). Fatigue of ei
ther muscle group produced earlier peak ankle plantar flexion moments
(p less than or equal to .05) and decreased peak propulsive knee flexi
on moments (p less than or equal to .05). Variables requiring further
study (p less than or equal to .1) provide discussion data. Soleus, ga
strocnemius, tibialis anterior, and deep posterior compartment calf mu
scles serve as dynamic impact force attenuators, compensating for fati
gued proximal muscles.