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

AM Harris, LR MacBride, RC Foster, SK McCrady… - Journal of Thermal …, 2006 - Elsevier
AM Harris, LR MacBride, RC Foster, SK McCrady, JA Levine
Journal of Thermal Biology, 2006Elsevier
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 …
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±344kcal/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.
Elsevier