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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Fatigue01:21

Fatigue

Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
Types of Damping01:20

Types of Damping

If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
Damped Oscillations01:07

Damped Oscillations

In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
Several...
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...

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Related Experiment Video

Updated: Jun 30, 2026

Application of Consistent Massage-Like Perturbations on Mouse Calves and Monitoring the Resulting Intramuscular Pressure Changes
07:49

Application of Consistent Massage-Like Perturbations on Mouse Calves and Monitoring the Resulting Intramuscular Pressure Changes

Published on: September 20, 2019

[Damping inserts have no load reducing effect in the fatigued state].

M Melnyk1, A Gollhofer

  • 1Institut für Sport und Sportwissenschaften, Albert-Ludwigs-Universität Freiburg. mark.melnyk@sport.uni-freiburg.de

Sportverletzung Sportschaden : Organ Der Gesellschaft Fur Orthopadisch-Traumatologische Sportmedizin
|September 25, 2008
PubMed
Summary

Damping inserts do not reduce impact loads or alter ground reaction forces, even with muscle fatigue. Early muscle activation with inserts during fatigue suggests increased energy expenditure, not load reduction.

Related Experiment Videos

Last Updated: Jun 30, 2026

Application of Consistent Massage-Like Perturbations on Mouse Calves and Monitoring the Resulting Intramuscular Pressure Changes
07:49

Application of Consistent Massage-Like Perturbations on Mouse Calves and Monitoring the Resulting Intramuscular Pressure Changes

Published on: September 20, 2019

Area of Science:

  • Biomechanics
  • Sports Medicine
  • Orthopedics

Context:

  • Repetitive lower limb overload injuries stem from non-physiological loads.
  • Damping inserts are proposed to mitigate these impact loads.
  • Limited evidence exists on their effectiveness, especially concerning muscle fatigue.

Purpose:

  • To investigate the influence of muscle fatigue on the effectiveness of damping inserts.
  • To analyze ground reaction forces and lower limb muscle activation during walking with and without inserts under fatigue conditions.

Summary:

  • No significant differences in ground reaction forces were observed with or without damping inserts, or during muscle fatigue.
  • While most muscle activations remained unchanged, peroneal and biceps femoris showed earlier preactivation with damping inserts during fatigue.
  • This earlier activation suggests increased energy expenditure rather than reduced loading.

Impact:

  • Damping inserts do not appear to reduce lower limb loading during walking, even when fatigued.
  • The perceived comfort of inserts does not correlate with reduced biomechanical loading.
  • Current evidence does not support recommending damping inserts for load reduction in lower limb injuries.