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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

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Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
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The Potential for a Targeted Strength-Training Program to Decrease Asymmetry and Increase Performance: A Proof of

Scott R Brown, Erin R Feldman, Matt R Cross

    International Journal of Sports Physiology and Performance
    |March 25, 2017
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    Summary
    This summary is machine-generated.

    Targeted training improved horizontal force (FH) production in the weaker leg, significantly reducing asymmetry. This led to enhanced sprint performance, including increased maximal velocity (vmax) and power (Pmax).

    Keywords:
    Woodway nonmotorized treadmillhip extensorshorizontal forcepowervelocity

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    Area of Science:

    • Biomechanics of human locomotion
    • Sports science and performance optimization
    • Athletic training and injury prevention

    Background:

    • Horizontal force (FH) via hip extension is crucial for sprint performance (maximal velocity [vmax], power [Pmax]).
    • The specific contribution of individual leg FH and the impact of leg asymmetry on sprint performance remain underexplored.
    • Understanding FH asymmetry is vital for developing targeted training interventions.

    Purpose of the Study:

    • To investigate the effects of a targeted hip-extension training program on FH asymmetry in a single athlete.
    • To assess the impact of reduced FH asymmetry on sprint performance metrics (vmax, Pmax).
    • To explore the relationship between individual leg FH, asymmetry, and overall sprint mechanics.

    Main Methods:

    • A single male athlete underwent a 6-week control period followed by a 6-week targeted hip-extension training program.
    • An instrumented nonmotorized treadmill was used to measure individual leg and global sprint kinetics.
    • FH, leg asymmetry, vmax, and Pmax were assessed pre- and post-intervention.

    Main Results:

    • The athlete's weak leg demonstrated a significant increase in FH (+26%, ES=2.2).
    • Horizontal force asymmetry decreased by 19% (ES=-0.64).
    • Maximal velocity (vmax) increased by 2% (ES=0.67), and maximal power (Pmax) increased by 15% (ES=3.2).

    Conclusions:

    • A targeted training intervention effectively reduced FH asymmetry and improved sprint performance metrics.
    • Reducing leg asymmetry in FH shows promise for enhancing athletic performance and potentially reducing injury risk.
    • This case study supports the theoretical link between individual leg force contribution and overall sprint capabilities, warranting further research.