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Related Concept Videos

Fatigue01:21

Fatigue

753
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...
753
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

3.8K
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...
3.8K
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

911
Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
911
Acute Respiratory Failure-I01:21

Acute Respiratory Failure-I

709
Acute respiratory failure is a condition characterized by the inability of the lungs to perform their primary function: gas exchange. This failure leads to insufficient oxygen levels (hypoxemia) in the blood, elevated carbon dioxide levels (hypercapnia), or both, causing critical impairment in organ function.
Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
709
Acute Respiratory Failure-III01:30

Acute Respiratory Failure-III

661
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
661
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

468
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...
468

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Related Experiment Video

Updated: Dec 23, 2025

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

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Fatigue-Related Aviation Mishaps.

Alex R Gaines, Megan B Morris, Glenn Gunzelmann

    Aerospace Medicine and Human Performance
    |April 25, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Fatigue significantly impacts U.S. Air Force (USAF) operations, causing severe mishaps and high costs despite low incidence. Remotely Piloted Aircraft (RPA) and ground crews may need better fatigue management strategies.

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    Area of Science:

    • Aviation Safety
    • Occupational Health
    • Risk Management

    Background:

    • Fatigue poses a critical safety risk to U.S. Air Force (USAF) flight and ground personnel.
    • Understanding fatigue's impact is crucial for enhancing USAF fatigue risk management policies and tools.

    Purpose of the Study:

    • To analyze 15 years of USAF mishap reports to identify trends and impacts of fatigue.
    • To inform improvements in fatigue risk management strategies and tools within the USAF.

    Main Methods:

    • Analysis of 19,920 aviation mishap reports from 2003 onwards from the Air Force Safety Automated System (AFSAS).
    • Identification of fatigue-related mishaps based on AFSAS designations.
    • Assessment of trends using contingency tables examining timing, cost, and aircraft metrics.

    Main Results:

    • Fatigue-related mishaps, though 3.88% of total, accounted for 18% of total costs ($2.1 billion).
    • Nearly 25% of fatigue mishaps were severe, with over 50% occurring between 0100 and 0700.
    • Remotely Piloted Aircraft (RPA) and ground operations showed higher rates of fatigue-related incidents.

    Conclusions:

    • Fatigue incurs substantial costs for the USAF due to the high proportion of severe mishaps.
    • RPA and ground maintenance operators may be particularly vulnerable to fatigue.
    • Enhanced fatigue mitigation tools and tailored training are needed for specific USAF operational environments.