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Related Concept Videos

Decreased Body Temperature01:29

Decreased Body Temperature

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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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Thermoregulation01:26

Thermoregulation

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The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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Circadian Rhythms and Gene Regulation02:19

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
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Factors Affecting Body Temperature01:28

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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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Biological Clocks and Seasonal Responses02:45

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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Related Experiment Video

Updated: Aug 6, 2025

Short-Duration Hypothermia Induction in Rats using Models for Studies examining Clinical Relevance and Mechanisms
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Short-Duration Hypothermia Induction in Rats using Models for Studies examining Clinical Relevance and Mechanisms

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Could Chronic Hypothermia in a Human Affect the Clock System?

André Malan, Gerhard Heldmaier

    Physiological and Biochemical Zoology : PBZ
    |March 15, 2023
    PubMed
    Summary

    Researchers explored if human hypothermia affects the circadian clock, similar to animal hibernation. Findings suggest a link, potentially enabling induced hibernation-like states in humans for clinical applications.

    Keywords:
    biological thermodynamicschronic hypothermiacircadian clockhuman hibernationtherapeutic hypothermia

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    Area of Science:

    • Chronobiology
    • Human Physiology
    • Animal Hibernation

    Background:

    • Animal hibernation involves a temperature-dependent clock, distinct from hypothermia.
    • Inducing hibernation-like states in humans has potential clinical and spatial applications.
    • Human hypothermia's effect on the circadian clock system remains under-explored.

    Purpose of the Study:

    • To investigate the potential influence of human hypothermia on the circadian clock system.
    • To determine if principles of animal hibernation's temperature-dependent clock apply to humans.

    Main Methods:

    • Revisiting Michel Siffre's 1962 "abyss experiment" data.
    • Analyzing Siffre's subjective time perception during prolonged isolation and hypothermia.
    • Applying the temperature-dependent clock equation from hibernating animals to Siffre's data.

    Main Results:

    • Siffre underestimated his time underground by 22 days, exhibiting chronic hypothermia.
    • The temperature-dependent clock equation accurately predicted Siffre's subjective time estimations.
    • Evidence suggests a connection between hypothermia and circadian clock disruption in humans.

    Conclusions:

    • Human hypothermia may impact the circadian clock system.
    • The study provides a predictive model for subjective time perception under hypothermic conditions.
    • Further research is warranted to explore conditions for inducing human hibernation-like bouts.