• J C Wells and P S Davies.
• Infant and Child Nutrition Group, Dunn Nutrition Unit, Cambridge, UK.
• Eur J Clin Nutr. 1995 May 1;49(5):323-8.

ObjectiveSleeping metabolic rate (SMR) is influenced by body size and body composition. In order to be able to compare SMR between individuals and groups, the best way to remove the effect of body size and body composition was sought.DesignA cohort of 50 infants was studied at 12 weeks. SMR was measured by indirect calorimetry, and body size and body composition by anthropometry and a stable isotope technique. Regression analysis was used to calculate the best way to remove the effect of body size and body composition on SMR.ResultsRegression analysis showed that SMR was adjusted for body weight and fat-free mass by raising body weight to the power 0.41, and by raising fat-free mass to the power 0.44. When SMR was at its minimum level, the optimum powers were 0.41 for body weight and 0.45 for fat-free mass.ConclusionsSMR can be adjusted for body weight, or fat-free mass thereby taking both body size and body composition into account, by expressing SMR in terms of weight or fat free mass raised to powers close to 0.50.

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