Human energy expenditure (EE) is not stable over a 24 hour period, it has its own rhythm. It varies depending on the time of the day, the physical activity level and the exercise performed by the subject, the amount of food ingested and its composition. The human 24-hour EE is made up of several components. Each component contributes to an individualized response and rhythm, therefore the different components can be identified as different stages of the 24h EE. By assigning different components to a specific time period, it is possible to measure the different components of the 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 components will be covered:

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

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