Human energy expenditure (EE) is not stable over a 24 hour period, it has its own rhythm. Energy expenditure varies depending on the time of day, habitual physical activity level, exercise performed by the subject, the amount of food ingested and food composition. Human 24-hour EE is made up of several components and these can be identified as different stages in 24h EE. It is possible to measure the different components of 24-hour EE with indirect calorimetry (IC) equipment. In this web series, we will discuss and explain all EE components one by one.

The following EE components will be covered:

  1. Sleeping or overnight metabolic rate (SMR / OMR)
  2. Basal metabolic rate or resting metabolic rate (BMR / RMR)
  3. Thermic effect of food or diet induced thermogenesis (TEF / DIT)
  4. Cold-induced thermogenesis (CIT)
  5. Activity energy expenditure or exercise induced thermogenesis (AEE / EIT)

Every fortnight a new part of this web series will be published online.