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Related Experiment Videos

Automated, eight-cage indirect calorimetry in rats

J D Luketich1, K E Michel, P G Curcillo

  • 1Harrison Department of Surgical Research, Hospital of the University of Pennsylvania, Philadelphia, USA.

Nutrition (Burbank, Los Angeles County, Calif.)
|October 7, 1998
PubMed
Summary

An automated indirect calorimeter (AIC) accurately measures rat energy expenditure during fasting. Manual methods may overestimate energy expenditure due to animal handling stress, impacting long-term starvation studies.

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Area of Science:

  • Physiology
  • Animal Metabolism
  • Calorimetry

Background:

  • Accurate measurement of energy expenditure is crucial for understanding metabolic adaptation.
  • Indirect calorimetry is a standard method for assessing energy expenditure in research animals.
  • Manual methods may introduce confounding variables like stress during prolonged measurements.

Purpose of the Study:

  • To construct and validate an automated indirect calorimeter (AIC) for rat energy expenditure measurement.
  • To compare the performance of AIC with a manual indirect calorimetry (MIC) system over a 30-hour fast.
  • To assess the impact of animal handling on metabolic measurements during starvation.

Main Methods:

  • Construction of an eight-cage automated indirect calorimeter (AIC).

Related Experiment Videos

  • Comparison of REE measurements between AIC and MIC in rats during a 30-hour fast.
  • Statistical analysis of correlation and agreement between the two calorimetry systems.

    • Main Results:

    • High correlation (r=0.90) and agreement between AIC and MIC during the initial 18 hours of fasting.
    • AIC showed a significant decrease in REE during the final 12 hours of fasting, indicating adaptive response.
    • MIC did not show a significant decrease in REE, with poor correlation (r=0.375) in the final 12 hours, suggesting stress-induced metabolic alterations.

    Conclusions:

    • The automated indirect calorimeter (AIC) provides accurate and reliable measurements of energy expenditure in rats during prolonged fasting.
    • Manual indirect calorimetry (MIC) may be less accurate for long-term studies due to stress from animal handling, potentially masking adaptive metabolic changes.
    • AIC offers significant advantages over manual methods for studying metabolic responses to starvation in rodents.