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What will validation validate?
Due to differences in criterion methods there are limitations concerning comparability of studies since the doubly labeled water method used for validation of daily energy expenditure [ 11, 12, 30] does not allow for the activity specific validation attended in the current study design.
Doubly labeled water measurements of total energy expenditure were used for validation.
Schoeller, D. A. et al. Energy expenditure by doubly labeled water - validation in humans and proposed calculation.
Energy expenditure by doubly labelled water: Validation in lean and obese subjects.
Secondly, in human and animal studies, accelerometry is usually validated against either directly observed movement or against energy expenditure, both methods being regarded widely as 'gold standards' for the validation of movement [ 2, 9– 11].
Year-2 expenditures were only used as a validation tool, in order to assess the performance of the PMs.
Once these datasets are available, independent validation studies must be performed, even though they require the expenditure of valuable time and funds.
Different methods have been applied as validation criteria; accelerometer, pedometer, recall-logs, heart-rate monitoring and different energy expenditure methods [ 32].
2. Frankenfield D et al. Validation of a 5-minute steady state indirect calorimetry protocol for resting energy expenditure in critically ill patients.
However, the validation study showed only a weak correlation between reported light activity and energy expenditure measured with ActiReg (0.21) (31).
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