Lower extremity muscle functions during full squats.

@article{Robertson2008LowerEM,
  title={Lower extremity muscle functions during full squats.},
  author={D. Gordon E. Robertson and Jean-Marie J. Wilson and Taunya A St Pierre},
  journal={Journal of applied biomechanics},
  year={2008},
  volume={24 4},
  pages={
          333-9
        }
}
The purpose of this research was to determine the functions of the gluteus maximus, biceps femoris, semitendinosus, rectus femoris, vastus lateralis, soleus, gastrocnemius, and tibialis anterior muscles about their associated joints during full (deep-knee) squats. Muscle function was determined from joint kinematics, inverse dynamics, electromyography, and muscle length changes. The subjects were six experienced, male weight lifters. Analyses revealed that the prime movers during ascent were… 

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References

SHOWING 1-10 OF 31 REFERENCES

Activity of mono- and biarticular leg muscles during sprint running

TLDR
The extensor muscles of the hip joint were found to be the primary movers by acceleration of the body's center of gravity during the ground phase of the running cycle, while the plantar flexors of the ankle joint showed the least contribution.

Knee flexor moments during propulsion in cycling--a creative solution to Lombard's Paradox.

Coordination in vertical jumping.

Kinetics of the parallel squat.

TLDR
Results indicated that high-skilled subjects minimized trunk torques by maintaining a more erect trunk position and also demonstrated more extensor-dominant thigh torques, and it was found that quasistatic or static treatments of the parallel squat provide results within 10% of the dynamic equations of motion.

Anatomic Guide for the Electromyographer: The Limbs

TLDR
This manual is a simple, practical anatomic guide to EMG of the limbs and deserves to be praised for its brevity, clarity, and overall accuracy.

Joit torque and energy patterns in normal gait

TLDR
As a result of the complexity shown in these patterns it is cautioned that fundamental relationships that may have been derived from controlled biomechanical experiments are not likely to apply to more normal movements such as gait.

Electromyographic amplitude normalization methods: improving their sensitivity as diagnostic tools in gait analysis.

TLDR
It was concluded that the reduction of intersubject variability by appropriate amplitude normalization is possible, thereby increasing the sensitivity of surface EMG as a diagnostic tool in gait analysis.

Mechanical energy generation, absorption and transfer amongst segments during walking.