This study attempted to determine the effect of eccentric quadriceps femoris, hamstring, and placebo fatigue on stance limb dynamics during the plant-and-cut phase of a crossover cut. Twenty female college students (task trained) were tested. Hamstring fatigue resulted in decreased peak impact knee flexion moments (p ≤.01), increased internal tibial rotation at peak knee flexion (p ≤ .05), and decreased peak ankle dorisflexion (p ≤ .05). Quadriceps fatigue resulted in increased peak ankle dorsiflexion moments (p < .01), decreased peak posterior braking forces (p ≤ .01), decreased peak knee extension moments (p ≤ .01), delayed peak knee flexion (p ≤ .01), delayed peak propulsive forces (p < .01), and delayed subtalar peak inversion moments (p ≤ .05). Fatigue of either muscle group produced earlier peak ankle plantar flexion moments (p ≤ .05) and decreased peak propulsive knee flexion moments (p ≤ .05). Variables requiring further study (p ≤ .1) provide discussion data. Soleus, gastrocnemius, tibialis anterior, and deep posterior compartment calf muscles serve as dynamic impact force attenuators, compensating for fatigued proximal muscles.
|Number of pages||14|
|Journal||Journal of Orthopaedic and Sports Physical Therapy|
|State||Published - Mar 1997|
Bibliographical noteFunding Information:
We acknowledge C Anders Olson, Laith Q Al-Mawsawi, Arthur Young Travis Chapa and Jamie Lloyd-Smith for their discussion and suggestions. We thank, Laith Q Al-Mawsawi and C Anders Olson for their comments and editing on the manuscript. This work was supported by the following grants: National Institute of Health CA183615 , AI110261 and Margaret E. Early Medical Research Trust . H.Q. was supported by the Interdisciplinary Training Grant in Virology and Gene Therapy from National Institute of Health ( 5T32AI060567 ). N.C.W. was supported by UCLA Dissertation Year Fellowship and Audree Fowler Fellowship in Protein Science.
- Compensatory dynamics
ASJC Scopus subject areas
- Physical Therapy, Sports Therapy and Rehabilitation