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Biological Research For Nursing
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A Comparison of Field Methods to Assess Body Composition in a Diverse Group of Sedentary Women

Karen T. D'Alonzo, PhD, RN, APNC

College of Nursing, Rutgers University, Newark, New Jersey, kdalonzo{at}rutgers.edu

Ana Aluf, RN, BSN

Linda Vincent, RN, MSN

Kristin Cooper, RN, BSN

Accurate assessment of body composition is essential in the evaluation of obesity. While laboratory methods are commonly used to assess fat mass, field measures (e.g., skinfold thickness [SKF] and bioelectrical impedance [BIA]) may be more practical for screening large numbers of individuals in intervention studies. In this study, a correlational design was used among 46 racially and ethnically diverse, sedentary women (mean age = 25.73 years) to (a) compare the percentage of body fat as determined by SKF and the upper body BIA and (b) examine the effects of body mass index (BMI), racial/ethnic background, age, and stage of the menstrual cycle on differences in the estimated percentage of body fat obtained using the SKF and BIA. Overall, a significant correlation between SKF and BIA (r = .98, p < .001) was found, with similar findings among Black, Hispanic and White non-Hispanic women. The mean differences between BIA and SKF were not significantly correlated with BMI, age, race/ethnicity or stage of the menstrual cycle. Data from this study suggest that BIA showed similar body fat prediction values compared with SKF and may be a viable alternative to SKF among diverse groups of healthy women. Additional testing and comparison of these field methods with the laboratory methods of hydrodensitometry or dual energy X-ray absorptiometry is recommended to further determine whether BIA devices can be routinely recommended as an alternative to the SKF.

Key Words: body composition • skinfold measurements • bioelectrical impedance

This version was published on January 1, 2009

Biological Research For Nursing, Vol. 10, No. 3, 274-283 (2009)
DOI: 10.1177/1099800408326583
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