Isometric
knee extensor force was measured using a dynamometer.
Not exact matches
Typically, kneecaps lessen the
force extensor muscles must exert to straighten the
knee.
This means that the hip
extensor and
knee extensor muscles are producing
force when they are at more moderate (and not short) muscle lengths.
As explained above, COD maneuvers most commonly involve
force production when the hip
extensors and
knee extensors are at moderate muscle lengths (although the exact joint angles can vary widely between individuals and tasks).
This suggests that the ability of the hip flexors and
extensors to produce
force, and the ability of the
knee extensors and flexors to absorb it, during the swing phase is the key to faster running.
To determine right
knee extensor MVC
force production, the subjects were seated on a
knee extension table with the
knee and hip flexed at 90 °.
Therefore, athletes sprint faster by producing more
force (concentrically) by the hip
extensors (gluteus maximus, adductor magnus, and hamstrings) and hip flexors, and then absorbing it (eccentrically) by the
knee flexors (hamstrings) and
extensors (quadriceps).