Valididy of the anthropometric equations for the estimated muscle mass in the elderly

Cassiano Ricardo Rech, Rodolfo André Dellagrana, Maria de Fátima Nunes Marucci, Edio Luiz Petroski

Abstract


The objective of this study was to compare skeletal muscle mass (SMM) in older adults estimated by dual-energy X-ray absorptiometry (DXA) and three predictive equations. A total of 180 older adults (120 women and 60 men) aged 60 to 81 years were studied. Appendicular SMM was measured by DXA and estimated using predictive equations based on anthropometric measures, age, race, and gender. Agreement between methods was evaluated by the paired t-test, Pearson’s correlation coefficient, and dispersion error. The prevalence of sarcopenia estimated with the different methods was compared using the kappa coefficient, sensitivity, and specificity. No difference was observed in mean SMM estimated by the predictive equation of Lee et al. and DXA (p>0.05), with a high correlation between methods in both men (r=0.90; p<0.001) and women (r=0.86; p<0.001). The prevalence of sarcopenia did not differ between methods (DXA = 33.3% vs equation = 36.1%), with high agreement between methods (kappa = 0.74; p<0.001) and high specificity (89%) and sensitivity (86%). The results indicate agreement between DXA and the predictive equation of Lee et al. for the estimation of SMM and the prevalence of sarcopenia in older adults.


Keywords


Anthropometry; Elderly; Muscle mass; Sarcopenia.



DOI: https://doi.org/10.5007/1980-0037.2012v14n1p23

The abbreviated title of the journal is Rev. Bras. Cineantropom. Desempenho Hum, which should be used in bibliographies, footnotes and bibliographical references. E-ISSN 1980-0037, impressa ISSN 1415-8426, Florianópolis, Santa Catarina, BrazilThis work is licensed under a Creative Commons Atribuição 3.0 Unported License.