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Validation of a field technique for the measurement of energy expenditure: factorial method versus continuous respirometry


, : Validation of a field technique for the measurement of energy expenditure: factorial method versus continuous respirometry. American Journal of Clinical Nutrition 44(5): 596-602

The field technique for measuring daily energy expenditure, using activity diary plus short-term indirect calorimetry, was validated with a room respirometer. Eleven male and 14 female subjects spent 24-h periods in the respirometer and kept an activity diary to the nearest minute. Subsequently, the energy cost of the recorded activities was measured in duplicate, and 24-h expenditure was calculated. Over the 42 24-h measurements the mean value by the factorial field method was within 1 per cent of that from continuous indirect calorimetry. However, the error in individual daily expenditure ranged from -17 per cent to +25 per cent. Correction of the error involved in using calculated BMR for the cost of sleeping resulted in a 5 per cent mean underestimation of the daily value. The factorial method is, therefore, too inaccurate for the estimation of individual daily expenditures but provides a close estimate of the true energy expenditure for population groups.(author)

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PMID: 3766445


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