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Related Concept Videos

Calorimetry01:19

Calorimetry

3.8K
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...
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Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

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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...
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Constant Volume Calorimetry02:41

Constant Volume Calorimetry

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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...
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Assessing Body Temperature - Rectal01:27

Assessing Body Temperature - Rectal

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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...
8.8K
Assessing Body Temperature - Oral01:14

Assessing Body Temperature - Oral

1.1K
Here are the steps to accurately measure oral temperature using an electronic thermometer:
Step 1:
Start by practicing proper hand hygiene to prevent the spread of microorganisms.
Step 2:
Take the thermometer out of the charging unit, switch it on, and wait for the ready sign.
Step 3:
Gently slide the probe cover until a click is heard. This simple action prevents cross-contamination and ensures the correct placement of the probe cover.
Step 4:
Instruct the patient to open their mouth and place...
1.1K
Calibration Curves: Correlation Coefficient01:10

Calibration Curves: Correlation Coefficient

4.0K
In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the...
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Updated: Nov 21, 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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Reliability of caloric testing.

Brian W Blakley1, Nasser Barakat2

  • 1Department of Otolaryngology, University of Manitoba, Health Sciences Centre - Winnipeg, GB421 - 820 Sherbrook Street, Winnipeg, Manitoba, R3A 1R9, Canada. BBlakley@exchange.hsc.mb.ca.

Irish Journal of Medical Science
|January 13, 2021
PubMed
Summary
This summary is machine-generated.

Caloric testing results show poor long-term stability in patients. Repeated testing over several years is unreliable for assessing vestibular function.

Keywords:
DizzinessElectronystagmographyTestingVestibular

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Vestibular System

Background:

  • Caloric testing is a standard diagnostic tool for evaluating vestibular function.
  • Assessing the long-term reliability of caloric testing is crucial for accurate patient management.
  • Previous studies have not extensively evaluated stability over periods up to 7 years.

Purpose of the Study:

  • To determine the long-term stability of caloric testing results.
  • To evaluate the reliability of repeated caloric tests over extended periods (up to 7 years).

Main Methods:

  • Retrospective analysis of caloric testing data from 200 patients.
  • Cronbach's alpha was used to assess the stability of test results over time.
  • Patients with no interventions and repeated testing in the same laboratory were included.

Main Results:

  • Cronbach's alpha for unilateral weakness was 0.512, indicating moderate stability.
  • Cronbach's alpha for the sum of caloric tests was 0.051, indicating poor stability.
  • Overall, caloric test results demonstrated low reliability over longer durations.

Conclusions:

  • Long-term caloric testing stability is not reliable for clinical decision-making.
  • Repeated caloric testing over extended periods may not yield consistent results.
  • Clinicians should exercise caution when interpreting long-term caloric test data.