Does non-exercise activity thermogenesis contribute to non-shivering thermogenesis?

Ann M. Harris, Leslie R. MacBride, Randal C. Foster, Shelly K. McCrady, James A. Levine

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We wanted to examine if spontaneous physical activity contributes to non-shivering thermogenesis. Ten lean, healthy male subjects wore a physical activity, micro-measurement system while the room temperature was randomly altered at two hourly intervals between thermoneutral (72 °F), cool (62 °F) and warm (82 °F) temperatures. Physical activity measured during the thermoneutral, cooling and warming periods was not significantly different. Cooling increased energy expenditure above basal and thermoneutral values 2061±344 kcal/day (p<0.01). Thus, the increase in energy expenditure associated with short-term environmental cooling in lean, healthy males does not appear to be due to increased spontaneous physical activity or fidgeting.

Original languageEnglish (US)
Pages (from-to)634-638
Number of pages5
JournalJournal of Thermal Biology
Issue number8
StatePublished - Dec 2006


  • Environmental temperature changes
  • Non-exercise activity thermogenesis
  • Non-shivering thermogenesis
  • Resting energy metabolism
  • Spontaneous physical activity

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • General Agricultural and Biological Sciences
  • Developmental Biology


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