A simple apparatus for comparative measurements of energy expenditure in human subjects: the thermic effect of caffeine

Am J Clin Nutr. 1981 Oct;34(10):2291-4. doi: 10.1093/ajcn/34.10.2291.


A simple inexpensive indirect calorimeter that is suitable for the estimation of energy expenditure in man is described. Its usefulness is demonstrated by a study of the effect of coffee on energy expenditure. Caffeinated coffee increased energy expenditure by 16% over 1 2-h period compared with decaffeinated coffee.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Caffeine / pharmacology*
  • Calorimetry, Indirect / instrumentation
  • Energy Metabolism / drug effects*
  • Female
  • Humans
  • Kinetics
  • Male
  • Middle Aged


  • Caffeine