Assessment of Energy Expenditure

Assessment of Energy Expenditure

The mechanisms underlying the reduction in body weight produced by novel anti-obesity drugs should always be investigated by measuring the effects of the compound on both sides of the energy equation balance.

Energy Expenditure

We offer a fully comprehensive metabolic profiling service using theΒ TSE PhenoMaster system. This 16-cage indirect calorimetry system, equipped with motion sensors and automated food and water hoppers, can be used to determine the effects of novel test drugs on energy expenditure. Β The following parameters can be measured simultaneously to elucidate the mode of action underpinning weight loss effects:

  • Oxygen consumption (VO2)
  • Carbon dioxide production (VCO2)
  • Energy expenditure (derived from VO2and VCO2)
  • Respiratory exchange ratio (RER; an estimate of relative substrate utilisation, ie shifts in fat and carbohydrate utilisation)
  • Food and water intake
  • Meal and drink patterns (ie frequency and size)
  • Ambulatory and rearing activity (measured as beam breaks)).

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The TSE PhenoMaster can be used to study mice or rats.

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The beta-3 adrenoceptor agonist, CL-316,243, increases energy expenditure in the dietary-induced obese (DIO) mouse

Energy Expenditure

The beta-3 adrenoceptor agonist, CL-316,243, increases utilization of fat (reduces RER) in the dietary-induced obese (DIO) mouse

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