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Related Concept Videos

Obesity01:24

Obesity

The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in adipocytes...
Increased Body Temperature01:25

Increased Body Temperature

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 response to an infection or illness.
Body Temperature01:07

Body Temperature

Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C (97–99°F), remaining relatively stable...
Body Temperature01:25

Body Temperature

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...
Decreased Body Temperature01:29

Decreased Body Temperature

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 sustained extreme cold exposure, and severe...
Assessing Body Temperature - Rectal01:27

Assessing Body Temperature - Rectal

Rectal temperature measurement is considered the most precise method for assessing core body temperature and typically registers higher than oral temperature. For adults, the rectal thermometer should be inserted 1 to 1.5 inches into the rectum to obtain the most accurate reading.
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...

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Related Experiment Video

Updated: Jun 4, 2026

Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans
04:54

Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans

Published on: June 2, 2023

Core body temperature in obesity.

Marc J Heikens1, Alexander M Gorbach, Henry S Eden

  • 1Unit on Growth and Obesity, Program in Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, US Department of Health and Human Services, Bethesda, MD 20892-1103, USA.

The American Journal of Clinical Nutrition
|March 4, 2011
PubMed
Summary
This summary is machine-generated.

Obese individuals do not have lower core body temperatures than normal-weight individuals. This study suggests core body temperature set point differences may not be a primary factor in obesity development.

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Area of Science:

  • Physiology
  • Metabolism
  • Obesity Research

Background:

  • A lower core body temperature set point is hypothesized to contribute to obesity.
  • Understanding the relationship between core body temperature and body weight regulation is crucial.

Purpose of the Study:

  • To investigate if obese individuals exhibit lower core body temperatures compared to normal-weight individuals.
  • To test the hypothesis linking reduced core temperature to obesity.

Main Methods:

  • Wireless core temperature-sensing capsules were used to continuously measure body temperature in nonobese and obese adults over 24-48 hours.
  • Activity logs were maintained by participants to correlate temperature with physical activity.
  • Daily 24-hour core temperature profiles were analyzed.

Main Results:

  • No significant difference in mean daily core body temperature was found between nonobese and obese subjects (36.92°C vs. 36.89°C).
  • Core body temperature 24-hour profiles also showed no significant differences between normal-weight and obese groups.
  • Women exhibited a slightly higher mean core body temperature (≈0.23°C) than men.

Conclusions:

  • Obesity is not generally associated with a reduced core body temperature.
  • Further research into individuals with genetic mutations affecting temperature regulation may be needed to understand the core body temperature set point's role in body weight.
  • Clinical trials registered under NCT00428987 and NCT00266500 informed these findings.