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Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...
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As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
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Related Experiment Video

Updated: Apr 30, 2026

A Preclinical Model of Exertional Heat Stroke in Mice
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Estimating mortality displacement during and after heat waves.

Ben Armstrong, Antonio Gasparrini, Shakoor Hajat

    American Journal of Epidemiology
    |May 10, 2014
    PubMed
    Summary

    Estimating mortality displacement from heat waves is challenging. A proposed displacement ratio method produces artifacts, leading to unreliable interpretations of heat-related deaths and their short-term displacement.

    Area of Science:

    • Environmental Epidemiology
    • Public Health
    • Biostatistics

    Background:

    • Heat waves cause excess mortality, with some deaths potentially occurring earlier than they otherwise would have (mortality displacement).
    • Accurately quantifying this short-term displacement is crucial for understanding the true impact of extreme heat events on population health.

    Purpose of the Study:

    • To evaluate a recently proposed "displacement ratio" method for estimating the proportion of heat-related deaths that are short-term displaced.
    • To assess the reliability and potential artifacts of this ratio method in the context of daily mortality data.

    Main Methods:

    • The study critically examined the "displacement ratio" method, which compares deficits in daily deaths to excesses following heat waves.
    • Simulations were employed to test the method's behavior under varying conditions, including natural Poisson variation in mortality counts.

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    Main Results:

    • The proposed displacement ratio method generates significant artifacts due to random variation in daily deaths, even in the absence of true displacement.
    • Simulations revealed spurious patterns, including a decrease in the displacement ratio with increasing heat wave severity, undermining its validity.

    Conclusions:

    • The "displacement ratio" method, as proposed, is unreliable for estimating mortality displacement due to inherent statistical artifacts.
    • Quantifying the extent of short-term mortality displacement following heat waves remains a complex and unresolved issue in environmental epidemiology.