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919
Category : Research Methodology
Sub Category : Other
DEVELOPING REGRESSION FORMULAS USING DEXA AS A CRITERION
METHOD FOR SEDENTARY WOMEN BETWEEN 40 AND 55 YEARS.
Nigar Sirek-Küçükkubaş, Feza Korkusuz
nigars@hacettepe.edu.tr
nigarsirek@hotmail.com
ABSTRACT
The present study aims at developing regression formulas and examining body
composition of sedentary women between the ages of 40-55 yrs. Fourty-seven women (46.66
± 3.52 yrs) were participated the study. Body composition parameters were measured by
DEXA and Holtain Skinfold Caliper. Dual Energy X-Ray Absorptiometry (DEXA) (Lunar
DPX Dual X-Ray Absorptiometry) was used to measure percent body fat percentage by total
body scan. Skinfold measurement were taken at nine skinfold sites (chest, midaxilla, triceps,
subscapula, abdomen, suprailium, thigh, biceps, and calf). Descriptive statistics of skinfold
thickness were calculated for sedentary women. To develop regression formulas DEXA was
used as a criterion method. Two regression formulas were developed to predict the DEXA fat
percentage by using the skinfold thickness.
F.1: % Body Fat= -1.777 + .761BMI + .499thigh + .177chest
( R 2 =0.88 and SEE=2.348)
F.2: % Body Fat = -1.564 + .761BMI + .471thigh + .157abdomen
(R 2 =0.86 and SEE=2.486)
Due to the difficulty of the taking chest measurement from the women, second formula was
developed by extracting the chest variables.
For the statistical analysis, SPSS 10.0 package program was used. Stepwise Multiple
Regression Analysis was used to develop the formulas.
Key Words: Body Composition, DEXA, Regression Equations, Skinfold Thickness, Sedentary
Women.