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Factors Affecting Body Temperature01:28

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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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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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The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Related Experiment Video

Updated: Sep 28, 2025

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
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Fluctuating temperature modifies heat-mortality association around the globe.

Yao Wu1,2, Bo Wen1,2, Shanshan Li1,2

  • 1Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne 3004, Australia.

Innovation (Cambridge (Mass.))
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Summary

Temperature variability significantly increases heat-related mortality risk globally. Public health strategies must address both extreme heat and fluctuating temperatures to reduce mortality burdens.

Keywords:
heatmodification effectmortalitytemperature variability

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Area of Science:

  • Environmental Health
  • Epidemiology
  • Climate Science

Background:

  • Heat exposure is a known risk factor for mortality.
  • The impact of temperature variability (TV) on modifying the heat-mortality association remains underexplored.

Purpose of the Study:

  • To investigate how temperature variability modifies the association between heat and mortality.
  • To quantify the global and regional burden of heat-related mortality attributable to TV.

Main Methods:

  • Utilized daily temperature and mortality data from 717 global locations.
  • Employed quasi-Poisson regression models with interaction terms to assess TV's modifying effect.
  • Pooled location-specific estimates to derive country, regional, and global associations.

Main Results:

  • Increased temperature variability was associated with a higher risk of heat-related mortality.
  • Attributable fractions for heat-related mortality increased with higher quartiles of TV, reaching 2.73% globally for the highest quartile.
  • Geographical variations were observed, with Central Europe showing the highest attributable fractions (7.68%) and North America the lowest (1.74%) for the highest TV quartile.

Conclusions:

  • Temperature variability significantly modifies the heat-mortality relationship, exacerbating mortality risk.
  • Public health interventions should simultaneously target heat exposure and temperature fluctuations.
  • Addressing both factors is crucial for mitigating the health impacts of climate change.