Related Experiment Video
Updated: Jul 26, 2026
11:39
Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants
Published on: March 14, 2013
Cerebral cortex does not modulate "regulated" decrease in core temperature during hypoxemia in rats
1Department of Physiology and Biophysics, University of Calgary, Health Sciences Centre, Alberta, Canada.
The American Journal of Physiology
|May 12, 1998
Summary
The cerebral cortex does not modulate the regulated decrease in core body temperature during acute hypoxemia (low oxygen). This study found that functional decortication did not alter hypoxemia-induced hypothermia in adult rats.
Area of Science:
- Neuroscience
- Physiology
Background:
- Acute hypoxemia (low oxygen) causes a regulated decrease in core body temperature in many species, including humans.
- The exact mechanism behind this hypothermia is not fully understood.
- The cerebral cortex is involved in autonomic regulation, including thermoregulation.
Purpose of the Study:
- To investigate the role of the cerebral cortex in modulating the regulated decrease in core body temperature during acute hypoxemia.
- To test the hypothesis that the cerebral cortex influences hypothermia induced by low oxygen levels.
Main Methods:
- Experiments were conducted on adult Sprague-Dawley rats.
- Core body temperature responses to acute hypoxemia were measured before and after inducing cortical spreading depression (functional decortication) using potassium chloride application.
- Baseline core temperature was monitored to assess the effect of functional decortication.
Main Results:
- Functional decortication had no impact on baseline core body temperature.
- Core body temperature decreased similarly during acute hypoxemia in rats with an intact cerebral cortex and those with functional decortication.
- The data did not support the hypothesis that the cerebral cortex plays a role in modulating hypothermia during acute hypoxemia.
Conclusions:
- The cerebral cortex does not appear to modulate the regulated decrease in core body temperature observed during acute hypoxemia in adult rats.
- Further research is needed to elucidate the neural pathways involved in hypoxemia-induced hypothermia.
Related Concept Videos
01:29Decreased 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...
01:23Hypoxia
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
01:18Neural Control of Respiration
The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
Respiratory Centers in the Brainstem
Two primary areas comprise the respiratory center: the medullary respiratory center in the medulla oblongata and the pontine respiratory group in the pons. The...
Respiratory Centers in the Brainstem
Two primary areas comprise the respiratory center: the medullary respiratory center in the medulla oblongata and the pontine respiratory group in the pons. The...
01:31Chemical Factors Affecting Respiration Centers
Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated. Under...
CO2 has a potent influence on respiration and is strictly regulated. Under...
01:26Thermoregulation
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,...
01:19Homeostatic 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...