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Related Concept Videos

Homeostatic Imbalances in Body Temperature01:19

Homeostatic Imbalances in Body Temperature

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...
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.
Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Exercise Stress Test01:26

Exercise Stress Test

Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Methods of reducing fever01:22

Methods of reducing fever

The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:

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Related Experiment Video

Updated: Jul 8, 2026

A Preclinical Model of Exertional Heat Stroke in Mice
08:22

A Preclinical Model of Exertional Heat Stroke in Mice

Published on: July 1, 2021

Are All Exertional Heat Strokes Equal?

Philémon Marcel-Millet1,2,3, Léa Tuifua1,2,4, Thomas Derouck3

  • 1Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, FRANCE.

Medicine and Science in Sports and Exercise
|July 6, 2026
PubMed
Summary

Complex exertional heat stroke (EHS) cases show distinct thermoeffector responses compared to simple EHS. Individuals with complex EHS exhibit higher core temperatures, indicating greater heat stress vulnerability.

Keywords:
HEAT INTOLERANCEHEAT TOLERANCE TESTMILITARY POPULATIONRETURN TO DUTYTHERMOREGULATION

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Published on: September 22, 2023

Area of Science:

  • Environmental Physiology
  • Sports Medicine
  • Thermoregulation

Background:

  • Exertional heat stroke (EHS) is often viewed as a singular condition.
  • Complex EHS cases, characterized by recurrence or lack of clear triggers, warrant further investigation.
  • Understanding thermoeffector responses is crucial for differentiating EHS subtypes.

Purpose of the Study:

  • To compare thermoeffector responses between individuals with complex EHS and those with simple, context-related EHS.
  • To investigate potential differences in heat tolerance and physiological responses in distinct EHS subgroups.
  • To identify factors contributing to heat intolerance in EHS patients.

Main Methods:

  • 56 participants were categorized into control (CONT), all EHS (ALL-EHS), simple EHS (SIMP-EHS), and complex EHS (COMP-EHS) groups.
  • Participants underwent anthropometric measurements and a heat tolerance test (HTT).
  • Key measurements included rectal temperature (Trec), sweat loss, and oxygen consumption.

Main Results:

  • Heat intolerance was prevalent across groups, notably higher in COMP-EHS (65%) compared to CONT (39%).
  • COMP-EHS participants exhibited significantly higher final Trec (38.8°C) than CONT and SIMP-EHS groups.
  • Heat-intolerant individuals displayed higher BMI, body fat, and lower surface area-to-mass ratio and sweat loss.

Conclusions:

  • Complex EHS cases present a unique physiological profile with elevated Trec, suggesting increased heat stress susceptibility.
  • While classical heat intolerance predictors were noted, they did not differentiate EHS groups, implying other factors are involved.
  • Heat tolerance testing may be particularly valuable for assessing complex EHS and informing return-to-duty decisions.