Does non-exercise activity thermogenesis contribute to non-shivering thermogenesis? |
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Authors: | Harris Ann M Macbride Leslie R Foster Randal C McCrady Shelly K Levine James A |
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Institution: | aEndocrine Research Unit, Mayo Clinic, Rochester 55905, MN, USA |
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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 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. |
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Keywords: | Environmental temperature changes Non-shivering thermogenesis Spontaneous physical activity Non-exercise activity thermogenesis Resting energy metabolism |
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