Poster Topical Area: Community and Public Health Nutrition
Poster Board Number: 126
Currently there is no anthropometric-based predictive equation calibrated using Stable Isotope Dilution (SID) for Nigerian population. The study was conducted to develop anthropometric-based predictive equations for determining body composition of Nigerian women using SID method.
The Quasi-experimental study was carried out at Ile-Ife, Osun State, Nigeria. Purposive sampling technique was used in recruiting consenting 173 apparently healthy Nigerian women (18-55 years) from the three major ethnic groups in Nigeria (Yoruba=81, Hausa=32 and Igbo=60). Height, weight (Wt), biceps, triceps, suprailliac and subscapular thickness (ST) and waist circumference (WC), hip circumference (HC), abdominal circumference (AC), forearm circumference (FC),were measured. To determine the body composition, pre-dose saliva samples were collected and 20 mg oral dose of sterile 99.9% deuterium oxide were administered. Four hour post-dose saliva samples were later collected for deuterium oxide enrichment analysis using Fourier Transform Infrared Spectrophotometer (FTIR).Three ethnic-specific and a general anthropometric-based predictive equations were developed for estimating %BF. The data was analyzed using descriptive statistics, linear regression and analysis of variance at 5% level of significance.
The Yoruba predictive equation was %BF= -241.588+38.468InWC +11.233InHC+11.495InWt; Igbo was %BF= -211.853+31.223InHC+1.497InWt+17.718InAC +4.608InFC; while that of Hausa was %BF= -188.173+17.935InWt+19.050InAC+13.433InWC. The general equation was %BF= -223.13+32.57 InWC+17.240InHC+4.43InWt+3.361InST. Correlations between %BF, body circumferences (r= 0.503-0.874) and skinfold thicknesses (r= 0.503-0.739). There were significant differences in the fat distribution of the ethnic groups and none in their mean %BF. The equations were cross validated and compared with existing anthropometric equations. Correlation coefficient ranged between 0.810-0.968, low pure error ranged between 2.34 -4.47 and root mean square error ranged between 2.617-5.224.
The developed predictive equations were valid for Nigerian women; therefore, the developed equations may be useful in clinical or epidemiological settings in lieu of stable isotope dilution method.
Assistant Director Dietetics
Obafemi Awolowo University Teaching Hospital,Ile ife Osun State,Nigeria
Ile Ife, Osun, Nigeria