Poster Topical Area: Community and Public Health Nutrition

Location: Auditorium

Poster Board Number: 126

P06-105 - Anthropometry based predictive equations for estimating Nigerian women percentage body fat using stable isotope technique as reference

Monday, Jun 11
8:00 AM – 3:00 PM

Objective
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.

Methodology

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.
Conclusion

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.




Funding Source: International Atomic Energy Agency(IAEA),Vienna.

CoAuthors: Joshua Ojo, Professor – Obafemi Awolowo University,Ile ife Osun state Nigeria; Grace Fadupin, Professor – University of Ibadan,Ibadan Oyo state Nigeria; Oyebamiji Oketayo, PhD – Federal University Oye-Ekiti

Obinna CHIMELA.. Ogbonna

Assistant Director Dietetics
Obafemi Awolowo University Teaching Hospital,Ile ife Osun State,Nigeria
Ile Ife, Osun, Nigeria