Table 1 Summary of measures.

From: The Physiology Of the WEight Reduced State (POWERS) study: assessing energy balance

Variable

Primary Measure

Secondary Measures

Weight

Body weight (scale in clinic)

Fat mass (dual energy X-ray absorptiometry, DXA), fat-free mass (DXA), height, waist circumference, body mass index (BMI)

Energy Expenditure

Total energy expenditure [doubly labeled water (DLW)]

Resting energy expenditure (REE), non-resting and activity energy expenditure (NREE and AEE), bicycle ergometry, grip strength

Energy Intake

Calculated from DLW and DXA

24-hour food recalls

  1. Non-resting energy expenditure (NREE) will be calculated as the difference between TEE and REE. Activity energy expenditure (AEE) will be calculated as the differences between NREE and the thermic effect of feeding (TEF, 0.1 x TEE).
  2. Resting energy expenditure (REE) will be measured by indirect calorimetry.
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