Daily metabolic rate in healthy infants - 29/08/11
, Debora Duro, MD, MS, Maribel Cedillo, RD, Sandra Valois, RD, Fima Lifshitz, MD
Reprint requests: Russell Rising, PhD, 514 Santander Ave #5, Coral Gables, FL 33134.Abstract |
Background Previous estimates of daily metabolic rate in infants were based on short-term unstandardized measurements of energy expenditure (EE).
Objective Determine 24-hour metabolic profiles in infants.
Methods Energy expenditure (kcal/min by indirect calorimetry) and physical activity (oscillations in weight/min/kg body weight) were measured in 10 healthy infants (5.0±0.8 months, 68±3 cm, 7.3±0.8 kg) for 24 hours in the Enhanced Metabolic Testing Activity Chamber while allowing parental interaction. Energy intake, 24-hour EE, resting metabolic rate (RMR), and sleeping metabolic rate (SMR) (kcal/kg/day) were determined. In addition, extrapolated 24-hour EE, RMR, and SMR from the first 4 and 6 hours of data were compared with 24-hour measurements.
Results Twenty-four–hour energy intake, EE, RMR, and SMR (mean±SD) were 78.2±17.6, 74.7±3.8, 65.1±3.5, and 60.3±3.9, respectively. EE and physical activity showed a decrease at 11:30 pm and a return to daytime levels by 5:30 am, suggesting a metabolic circadian rhythm. Extrapolated 24-hour EE, RMR, and SMR from the first 4 hours (72.2±6.6, 65.9±8.7, and 64.9±6.4) and 6 hours (74.8±6.7, 65.8±6.6, and 64.8±5.6) were similar to 24-hour measurements.
Conclusions An apparent circadian rhythm in metabolic rate and physical activity was detected by 24-hour measurements. Furthermore, shorter-term measurements of the variables were comparable with 24-hour values.
Le texte complet de cet article est disponible en PDF.Abbreviations : EE, EMTAC, RMR, SMR
Plan
 | Supported in part by National Institutes of Health grant #1R43HD/DK38180-01A2 and by Pediatric Sunshine Academics. |
Vol 143 - N° 2
P. 180-185 - août 2003 Retour au numéro
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