Of the methods for measuring or estimating energy expenditure mentioned in chapter 5 of the text, which is considered the "gold standard" for the measurement of total energy expenditure in free-living conditions?
A. Direct calorimetry
B. Indirect calorimetry
C. Isotope measurements (doubly labeled water)
D. Heart rate monitoring
E. Pedometry and accelerometry
F. Self-report of physical activity



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