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Global Climate Change01:50

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Homeostatic Imbalances in Body Temperature01:19

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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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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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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

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Simulating Temperature in a Soil Incubation Experiment
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Cause-specific mortality and burden attributable to temperature variability in China.

Jiangmei Liu1, Xihao Du2, Peng Yin1

  • 1National Center for Chronic and Noncommunicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.

The Science of the Total Environment
|July 5, 2023
PubMed
Summary

Temperature variability (TV) is a significant risk factor for mortality in China. This study found TV increases total, cardiovascular, and respiratory disease mortality, highlighting a substantial public health burden.

Keywords:
Cardiorespiratory diseasesDisease burdenMortalityTemperature variabilityTime-series study

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Area of Science:

  • Environmental Health
  • Epidemiology
  • Climate Science

Background:

  • Nationwide studies on temperature variability (TV) and cause-specific mortality risks are limited.
  • Assessing the mortality burden associated with TV is crucial for public health interventions.

Approach:

  • Utilized daily mortality data from 272 Chinese cities (2013-2015).
  • Calculated TV using standard deviations of daily temperature fluctuations over 2-7 day periods.
  • Employed time-series quasi-Poisson regression and meta-analysis to estimate TV-mortality associations and burdens.

Key Points:

  • TV demonstrated significant positive associations with total and cause-specific mortality.
  • A 1°C increase in TV (0-7 days) correlated with a 0.79% rise in total mortality.
  • Attributable mortality fractions were substantial for cardiovascular (4.75%) and respiratory diseases (6.93%), particularly ischemic stroke (8.28%) and COPD (6.81%).
  • Higher risks were observed in temperate zones, females, and the elderly.

Conclusions:

  • Temperature variability is an independent risk factor for mortality in China.
  • TV contributes significantly to the burden of major cardiorespiratory diseases.
  • Findings underscore the need for public health strategies to mitigate climate-related mortality risks.