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Related Concept Videos

Muscles that Move the Leg01:23

Muscles that Move the Leg

The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
Anterior Compartment
The quadriceps femoris, the most visible muscle of the anterior compartment, is integral for leg extension and thigh flexion. It is formed by merging four distinct muscles — the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. The quadriceps tendon, a shared tendon of the four quadriceps muscles, is affixed to...

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Related Experiment Video

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Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI
14:55

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Published on: April 18, 2011

Quadriceps torque and integrated electromyography*.

B Brownstein, R E Lamb, R E Mangine

    The Journal of Orthopaedic and Sports Physical Therapy
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    This study found sex differences in quadriceps muscle activity during knee flexion. Maximal torque and integrated electromyography occurred at different angles for males and females, impacting normalization procedures.

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    Area of Science:

    • Biomechanics
    • Human Movement Science
    • Sports Medicine

    Background:

    • Understanding quadriceps muscle function is crucial for analyzing lower limb biomechanics.
    • Isometric contractions are commonly used to assess muscle strength and activation.
    • Normalization of electromyography (EMG) data requires careful consideration of muscle behavior across different joint angles.

    Purpose of the Study:

    • To determine the optimal knee flexion angle for normalizing quadriceps muscle activity.
    • To investigate how quadriceps behavior changes with varying knee flexion angles.
    • To explore potential sex-based differences in quadriceps muscle response.

    Main Methods:

    • Surface electromyography (sEMG) was used to record myoelectric activity.
    • Torque production of the quadriceps femoris muscle group was measured.
    • Isometric contractions were performed at various knee flexion angles.

    Main Results:

    • Maximal torque and integrated electromyography (IEMG) varied between sexes.
    • Males exhibited peak activity at 50 degrees of knee flexion.
    • Females demonstrated peak activity at 70 degrees of knee flexion.

    Conclusions:

    • Sex influences the knee flexion angle for maximal quadriceps torque and myoelectric activity.
    • These findings have implications for dynamic normalization of EMG data in quadriceps studies.
    • Optimal muscle activation angles should inform the biomechanical assessment of patellofemoral disorders.