Genç Erkek ve Kadınlarda Yağsız Vücut Kütlesinin Kestiriminde Kullanılan Biyoelektrik İmpedans Denklemlerinin Geçerliği

Öz

Bu çalışmanın amacı genç erkek ve kadınlarda yağsız vücut kütlesinin (YVK) kestiriminde kullanılan biyoelektrik impedans analizi (BIA) denklemlerinin geçerliğini belirlemektir. Çalışmaya yaşları 18 ila 25 arasında değişen 113 erkek, 82 kadın olmak üzere toplam 195 yetişkin gönüllü olarak katılmıştır. Katılımcıların elden ayağa BIA yöntemi kullanılarak elde edilen rezisyans (R) ve reaktans (Xc) değerleri yaygın olarak kullanılan 8 denkleme uygulanarak (Deurenberg 1990, Deurenberg 1991, Lohman 1992, Kyle 2001, Kyle 2003, Sun 2003, Lukaski ve Bolonchuk 1987, Segal 1988) YVK belirlenmiştir. BIA denklemlerinden elde edilen YVK değerleri referans yöntem olarak kullanılan Dual Enerji X-Işını Absorbsiometre’den (DXA) elde edilen YVK değerleriyle karşılaştırılmıştır. BIA denklemlerinden ve DXA’dan elde edilen YVK değerleri arasındaki farklar Bağımlı Gruplarda t Testi ile analiz edilmiştir. BIA denklemlerinden ve DXA’dan elde edilen YVK değerleri arasındaki doğruluk düzeyi Lin’in uyum (Concordance) korelasyon katsayısı (ρc) ile belirlenmiştir. Bireysel seviyede değerlendirme için her bir BIA denklemi ve DXA’dan elde edilen YVK arasında Bland-Altman grafikleme yapılmış ve %95 tutarlık sınırları belirlenmiştir. Erkeklerde Lukaski ve Bolonchuk 1987 denkleminden kestirilen YVK ve DXA’da ölçülen YVK arasında anlamlı fark saptanmamıştır (p>0.05). Benzer şekilde erkeklerde aynı denklemin DXA ile uyum korelasyon katsayısı ρc = 0.93 orta düzeydedir. Kadınlarda Deurenberg 1990, Deurenberg 1991 ve Sun 2003 ile kestirilen YVK ve DXA’da ölçülen YVK arasında anlamlı fark saptanmamıştır (p>0.05). Bu üç denklemden elde edilen YVK değerleri ve DXA arasındaki uyum korelasyon katsayıları (pc) sırasıyla 0.93, 0.91 ve 0.92’dir ve orta düzeydedir. Bu çalışmanın bulguları genç erkeklerde YVK’nın kestiriminde Lukaski ve Bolonchuk 1987, kadınlarda ise Deurenberg 1990, Deurenberg 1991 ve Sun 2003 formüllerinin kullanılabileceğini göstermiştir. Bununla beraber, bu çalışmanın bulguları vücut kompozisyonunun değerlendirilmesinde kullanılan BIA denklemlerinin popülasyon spesifik olduğunu da göstermiştir.

Anahtar Kelimeler

• Vücut Kompozisyonu
• Biyoelektrik İmpedans Analizi
• Dual Enerji X-ışını Absorbsiyometre

Validity of Bioelectric Impedance Equations Used in Estimation of Fat Free Mass in Young Men and Women

Öz

The aim of this study was to determine the validity of bioelectrical impedance analysis equations used for the prediction of fat free mass (FFM) in young men and women. A total of 195 young adults, 113 males and 82 females between ages of 18 and 25 years, participated in this study voluntarily. The resistance (R) and reactance (Xc) values obtained from the participants' by using hand-to-foot BIA method were applied to 8 commonly used equations (Deurenberg 1990, Deurenberg 1991, Lohman 1992, Kyle 2001, Kyle 2003, Sun 2003, Lukaski and Bolonchuk 1987, Segal 1988) to determine the FFM. The FFM values obtained from the BIA equations were compared with the FFM values obtained from Dual Energy X-Ray Absorbsiometer (DXA), which was used as a reference method. Differences between FFM values obtained from BIA equations and DXA were analyzed by paired samples t-test. The level of accuracy between the FFM values obtained from BIA equations and DXA was determined by Lin's concordance correlation coefficient (ρc). The limits of agreement were determined as 95% for FFM which was obtained from the BIA equations and DXA. Results indicated no significant difference between FFM obtained from Lukaski ve Bolonchuk 1987 equation and measured from DXA in men (p>0.05). In men the correlation coefficient between the same equation and DXA (ρc = 0.93) was moderate. On the other hand, no significant difference was found between the FFM estimated by Deurenberg 1990, Deurenberg 1991 and Sun 2003 and measured by DXA in women (p>0.05). The concordance correlation coefficients between the FFM values obtained from these three equations and DXA were also moderate (pc 0.93, 0.91 and 0.92 respectively). The findings of this study showed that Lukaski and Bolonchuk 1987 formula can be used for predicting body composition in young men and Deurenberg 1990, Deurenberg 1991 and, Sun 2003 equations can be used for predicting body composition in young women. The findings of this study also demonstrated that the BIA equations used in the assessment of body composition are population specific.

Anahtar Kelimeler

• Body Composition
• Bioelectric Impedance Analysis
• Dual Energy X-ray Absorptiometry

Kaynakça

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