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Related Concept Videos

Thermal Strain01:19

Thermal Strain

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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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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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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 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.
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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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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 8, 2026

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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[HAMSTRING STRAIN INJURIES IN SPORTSMEN].

Atzmon Tsur1

  • 1Rehabilitation Department Galilee Medical Center, Nahariya Faculty of Medicine, Bar-Ilan University, Safed.

Harefuah
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Summary
This summary is machine-generated.

Acute hamstring strain injuries are prevalent in athletes, often occurring during high-speed movements. Rehabilitation should focus on neuromuscular control and eccentric strengthening for successful return to sport.

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Area of Science:

  • Sports Medicine
  • Biomechanics
  • Musculoskeletal Injury

Background:

  • Acute hamstring strain injuries are frequent in athletes participating in sprinting, kicking, and jumping activities.
  • Despite advancements in understanding, the incidence of these injuries remains high.
  • Injuries typically occur at the proximal musculo-tendon junction during the terminal swing phase of gait.

Purpose of the Study:

  • To review the incidence, risk factors, and rehabilitation strategies for acute hamstring strain injuries.
  • To emphasize the importance of neuromuscular control and eccentric strengthening for athlete recovery.

Main Methods:

  • Literature review of hamstring strain injuries.
  • Analysis of proposed risk factors including fatigue, flexibility, muscle imbalance, and warm-up.
  • Discussion of rehabilitation principles for return to sport.

Main Results:

  • Common risk factors identified: fatigue, poor flexibility, low hamstring to quadriceps strength ratio, and inadequate warm-up.
  • Proximal musculo-tendon junction is a common injury site.
  • Certain injuries necessitate prolonged rehabilitation and delayed return to play.

Conclusions:

  • Neuromuscular control and eccentric strengthening are crucial for successful return to sport after hamstring injury.
  • Addressing identified risk factors may help reduce injury incidence.
  • Further research into prevention and optimized rehabilitation is warranted.