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Related Concept Videos

Fatigue01:21

Fatigue

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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...
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Impedances and Admittance01:23

Impedances and Admittance

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In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
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Impedance Combination01:21

Impedance Combination

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Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the voltage...
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Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

556
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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Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
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Related Experiment Video

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Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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Time-course bicep tissue bio-impedance changes throughout a fatiguing exercise protocol.

Todd J Freeborn1, Bo Fu1

  • 1Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA.

Medical Engineering & Physics
|May 7, 2019
PubMed
Summary
This summary is machine-generated.

Electrical impedance changes in biceps tissue were observed during fatiguing exercise. Resistance, reactance, and phase angle significantly altered, with resistance changes appearing earliest.

Keywords:
BioimpedanceFatigue

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The Treadmill Fatigue Test: A Simple, High-throughput Assay of Fatigue-like Behavior for the Mouse
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Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Skeletal Muscle Physiology

Background:

  • Muscle fatigue is characterized by decreased force production.
  • Electrical impedance myography (EIM) offers a non-invasive method to assess tissue properties.
  • Understanding impedance changes during fatigue can reveal underlying physiological alterations.

Purpose of the Study:

  • To investigate localized electrical impedance changes in biceps brachii during a fatiguing exercise protocol.
  • To determine if resistance, reactance, and phase angle exhibit significant alterations with increasing fatigue.
  • To compare the temporal dynamics of impedance parameter changes.

Main Methods:

  • Seventeen participants performed 10 sets of biceps curls to failure at 60% or 75% of one-repetition maximum.
  • Localized tissue impedance (resistance, reactance, phase angle) was measured at 10, 50, and 100 kHz post-set.
  • Measurements were compared against pre-fatigue baseline values.

Main Results:

  • A trend of decreasing resistance and reactance magnitude was observed as exercise progressed.
  • Statistically significant changes in resistance, reactance, and phase angle were detected in both exercise intensity groups.
  • Significant resistance changes occurred earlier than reactance and phase angle changes.

Conclusions:

  • Fatiguing exercise induces significant localized electrical impedance changes in biceps brachii.
  • Resistance changes appear to be an earlier indicator of muscle fatigue than reactance and phase angle.
  • EIM is a sensitive technique for monitoring physiological alterations during muscle fatigue.