Prepregnancy Body Mass Index and Resting Metabolic Rate during PregnancyMelzer K. · Schutz Y. · Soehnchen N. · Othenin Girard V. · Martinez de Tejada B. · Pichard C. · Irion O. · Boulvain M. · Kayser B.
aInstitute of Movement Sciences and Sports Medicine, Faculty of Medicine, University of Geneva, and bDepartment of Obstetrics and Gynaecology, and cNutrition Unit, University Hospitals of Geneva, Geneva, and dDepartment of Physiology, University of Lausanne, Lausanne, Switzerland
Aim: The resting metabolic rate (RMR) varies among pregnant women. The factors responsible for this variability are unknown. This study aimed to assess the influence of the prepregnancy body mass index (BMI) on the RMR during late pregnancy. Methods: RMR, height, weight, and total (TEE) and activity (AEE) energy expenditures were measured in 46 healthy women aged 31 ± 5 years (mean ± SD) with low (<19.8), normal (19.8–26.0), and high (>26.0) prepregnancy BMI at 38.2 ± 1.5 weeks of gestation (tgest) and 40 ± 7 weeks postpartum (tpost) (n = 27). Results: The mean tgest RMR for the low-, normal-, and high-BMI groups was 1,373, 1,807, and 2,191 kcal/day, respectively (p = 0.001). The overall mean tgest RMR was 316 ± 183 kcal/day (21%), higher than the overall mean tpost value and this difference was correlated with gestational weight gain (r = 0.78, p < 0.001). The scaled metabolic rate by allometry (RMR/kilograms0.73) was similar in the low-, normal-, and high-BMI groups, respectively (p = 0.45). Changes in tgest TEE closely paralleled changes in tgest RMR (r = 0.84, p < 0.001). AEE was similar among the BMI groups. Conclusion: The RMR is significantly increased in the third trimester of pregnancy. The absolute gestational RMR is higher in women with high prepregnancy BMI due to increased body weight. The scaled metabolic rate (RMR/kilograms0.73) is similar among the BMI groups of pregnant women.
Prof. Bengt Kayser, MD PhD
Institut des sciences du mouvement et de la médecine du sport
Faculté de médecine, Université de Genève
10 rue du Conseil Général, CH–1205 Geneva (Switzerland)
Tel. +41 22 379 0028, Fax +41 22 379 0035, E-Mail Bengt.Kayser@unige.ch
Presented in part as an abstract at the 2008 ESPEN Congress in Florence, Italy.
Received: September 25, 2009
Accepted after revision: October 29, 2010
Published online: December 2, 2010
Number of Print Pages : 7
Number of Figures : 1, Number of Tables : 2, Number of References : 46
Annals of Nutrition and Metabolism (Journal of Nutrition, Metabolic Diseases and Dietetics)
Vol. 57, No. 3-4, Year 2010 (Cover Date: January 2011)
Journal Editor: Elmadfa I. (Vienna)
ISSN: 0250-6807 (Print), eISSN: 1421-9697 (Online)
For additional information: http://www.karger.com/ANM