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Related Concept Videos

Eccentric Loading01:16

Eccentric Loading

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Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
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Exercise and Muscle Performance01:27

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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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General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
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Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Exercise and Cardiac Output01:17

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Design of Columns under an Eccentric Load01:21

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Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent...
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Related Experiment Video

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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Eccentric-Overload Training in Team-Sport Functional Performance: Constant Bilateral Vertical Versus Variable

Oliver Gonzalo-Skok, Julio Tous-Fajardo, Carlos Valero-Campo

    International Journal of Sports Physiology and Performance
    |December 15, 2016
    PubMed
    Summary

    Eccentric-overload training (EOT) improves functional performance in team-sport athletes. A varied, multi-directional approach (VUMD) enhanced change-of-direction and jumping more than traditional bilateral training (CBV).

    Keywords:
    conical pulleyforce-vector trainingresistance trainingvariable training

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    Area of Science:

    • Sports Science
    • Exercise Physiology
    • Biomechanics

    Background:

    • Eccentric-overload training (EOT) is a potent method for enhancing strength and power.
    • Functional performance is critical for success in team sports, encompassing agility, speed, and jumping ability.
    • The application of force vectors in training may influence specific adaptations in athletes.

    Purpose of the Study:

    • To compare the effects of two distinct EOT programs on functional performance in team-sport players.
    • To evaluate a traditional bilateral vertical movement (CBV) paradigm against a novel unilateral multidirectional movement (VUMD) paradigm.

    Main Methods:

    • Forty-eight team-sport players participated in an 8-week EOT intervention.
    • Participants were randomized into either a conventional bilateral vertical (CBV) squat group or a varied unilateral multidirectional (VUMD) movement group.
    • Functional assessments included change-of-direction, linear sprinting, unilateral multidirectional jumping, and bilateral vertical jump tests.

    Main Results:

    • Both EOT programs yielded significant improvements in functional performance across all tested variables.
    • The VUMD group demonstrated superior adaptations in pooled change-of-direction tests and lateral/horizontal jumping.
    • The CBV group showed greater improvements in linear sprinting and vertical jumping compared to VUMD.

    Conclusions:

    • Eight weeks of EOT significantly enhances functional performance in team-sport athletes.
    • The specific application of force vectors, as seen in VUMD versus CBV, plays a crucial role in developing distinct and targeted functional adaptations.
    • Training program design, emphasizing either bilateral vertical or unilateral multidirectional movements, can differentially impact athletic performance metrics.