title: Does Non-Exercise Activity Thermogenesis Contribute to Non-Shivering Thermogenesis?
abstract: 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 whilst 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 EE 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.
authors.affiliation: Endocrine Research Unit, Mayo Clinic, Rochester, Minnesota, 55905.
authors.forename: Ann M
authors.initials: AM
authors.lastname: Harris
authors.forename: Leslie R
authors.initials: LR
authors.lastname: Macbride
authors.forename: Randal C
authors.initials: RC
authors.lastname: Foster
authors.forename: Shelly K
authors.initials: SK
authors.lastname: McCrady
authors.forename: James A
authors.initials: JA
authors.lastname: Levine