Methodenvergleich von bioelektrischer Impedanz-Analyse und Dual Energy X-ray Absorptiometry zur Detektion von Körperfett und Übergewicht bei Probanden der Berliner Altersstudie II (BASE-II)

Due to demografic changes overweight, malnurtrition and sarcopenic obesity represent an increasing problem of our time. Especially in old people the Body Mass Index (BMI) sometimes leads to a false categorisation due to a change in body composition. Thus precise methods are necessary to analyse body compartments. Bioelectricial Impedance Analysis (BIA) and Dual Energy X-Ray Absorptiometry (DEXA) are the generally used techniques for measuring body composition nowadays. In the since 2009 realized cross-sectional and also long-term intended Berlin Aging Study II (BASE-II) 498 people had been examined. Both methods correlated highly (r=.86, p<.001). The measured percental body fat also showed a good correlation to BMI (BIA – BMI: men r =.67, women r =.86; p <.001; DEXA – BMI: men r =.71, women r =.81 p < .001). Despite a high correlation, the measured values differed to 8.21 in percental body fat. In 486 cases DEXA measured higher body fat than BIA. There"s still a high deviation in the measured values and thus none of both methods should be treated as new goldstandard of body fat measuring yet