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Related Concept Videos

Thermal Strain01:19

Thermal Strain

2.9K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Shearing Strain01:20

Shearing Strain

1.5K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Measurements of Strain01:27

Measurements of Strain

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Strain Energy01:13

Strain Energy

1.0K
Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
1.0K
Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

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Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
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Stress-Strain Diagram01:10

Stress-Strain Diagram

3.4K
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Related Experiment Video

Updated: Feb 16, 2026

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations

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Hamstring Strains.

Thomas M Best, William E Garrett

    The Physician and Sportsmedicine
    |December 29, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Hamstring strains are common injuries that often recur, leading to long recovery times. Current rehabilitation focuses on functional exercises, stretching, and strengthening, though optimal methods remain debated.

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    Area of Science:

    • Sports Medicine
    • Orthopedic Surgery
    • Rehabilitation Science

    Background:

    • Hamstring strains are frequent injuries in athletes and active individuals.
    • These injuries often lead to prolonged recovery periods and significant disability.
    • Recurrence of hamstring strains is a common and challenging clinical problem.

    Purpose of the Study:

    • To review the epidemiology, diagnosis, and management of hamstring muscle strains.
    • To discuss current treatment strategies and rehabilitation approaches for hamstring injuries.
    • To highlight the challenges associated with recurrent hamstring injuries.

    Main Methods:

    • Literature review of hamstring strain injuries.
    • Analysis of diagnostic methods including clinical examination and MRI.
    • Synthesis of current treatment and rehabilitation principles.

    Main Results:

    • Hamstring injuries most commonly involve a single muscle near the muscle-tendon junction.
    • Diagnosis is typically based on patient history and physical examination, with MRI aiding in extent assessment.
    • Initial management includes rest, ice, compression, elevation, and analgesia.

    Conclusions:

    • Optimal rehabilitation protocols for hamstring strains are not yet established.
    • Functional exercises, stretching, and strengthening are key components of rehabilitation.
    • Addressing the high recurrence rate remains a critical aspect of hamstring injury management.