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Calorimetry

Calorimetry

When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...

Constant Pressure Calorimetry

Constant Pressure Calorimetry

Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...

Temperature Measurement Sites

Temperature Measurement Sites

A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...

Constant Volume Calorimetry

Constant Volume Calorimetry

Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...

Assessing Body Temperature - Rectal

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.
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Special considerations while measuring oxygen saturation

Special considerations while measuring oxygen saturation

Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
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Related Experiment Video

Updated: Dec 13, 2025

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

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

Indirect calorimetry: The 6 main issues.

Najate Achamrah¹, Marta Delsoglio², Elisabeth De Waele³

¹Nutrition Department, Rouen University Hospital Center, Rouen, France; Normandie Univ, URN, INSERM UMR 1073, Nutrition, Inflammation et dysfonction de l'axe Intestin-Cerveau, IRIB, Rouen, France.

Clinical Nutrition (Edinburgh, Scotland)

|July 26, 2020

Summary

This summary is machine-generated.

Indirect calorimetry precisely measures energy expenditure, optimizing nutritional therapy for better patient outcomes. Routine use of this technique is recommended for improved clinical nutrition care.

Keywords:

Energy expenditure Indirect calorimetry Medico-economics Optimal nutritional therapy

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Last Updated: Dec 13, 2025

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

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Area of Science:

Clinical Nutrition
Metabolic Monitoring
Medical Technology

Background:

Optimal nutritional therapy requires precise energy management for improved clinical outcomes.
Indirect calorimetry is the gold standard for measuring and monitoring energy expenditure.
Understanding indications, contraindications, and repeat measurements is crucial for effective clinical use.

Purpose of the Study:

To equip clinicians with the knowledge for routine indirect calorimetry use.
To guide the interpretation of indirect calorimetry results in clinical practice.
To highlight the benefits of tailored nutrition therapy based on measured energy expenditure.

Main Methods:

Bibliographic research of PubMed publications.
Keywords included: indirect calorimetry, energy expenditure, nutritional therapy.
Focus on recent studies (last 10 years) covering principles, innovations, and clinical/economic aspects.

Main Results:

Consolidated knowledge for routine indirect calorimetry application and result interpretation.
Clinical cases demonstrate decision-making for nutritional therapy prescription and optimization.
Technical innovations and medico-economic benefits of tailored nutrition therapy are presented.

Conclusions:

Routine indirect calorimetry is encouraged for optimizing nutrition care.
Accurate energy expenditure measurement leads to better clinical outcomes.
Personalized nutrition therapy guided by indirect calorimetry offers significant benefits.