豚肉を用いたBI法の基礎的研究

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This study examined local impedance measurement conditions for the estimation of human local skeletal muscle by the BI method using pork. Impedance was measured for 84 pork samples, using a four-terminal impedance plethysmograph (500 μA, 50 kHz; Precision RLC Meter by Quad Tech, USA). In the present study, resistivity was compared by setting the I-V electrode distance at 3 cm and varying the V-V electrode distance at 4-6 cm, 7-9 cm, 10-12 cm, 13-15 cm and ≧16 cm. The obtained results indicate that the resistivity was high when the V-V electrode distance was short at 4-6 cm. In addition, the relationship between resistivity and sample cross-sectional diameter was investigated, and the results confirmed a significant correlation. Furthermore, the relationship between resistivity and sample diameter was assessed in relation to various V-V electrode distances, and the results show that, even when the diameter remained the same, the resistivity tended to be high when the V-V electrode distance was short at 4-6 cm. These findings suggest that when estimating human local skeletal muscle, if the I-V electrode distance is set at 3 cm, the V-V electrode distance must be at least 7 cm. In the present study, a regression analysis was performed by handling the weight and impedance index obtained by the above-mentioned electrode arrangement as independent variables and the volume of sample determined by graduated cylinder as a dependent variable. Regression equations developed in the present study for estimating sample volume were: 1. V =0.950W-2.7 (R^2=0.999, SEE=1.7) 2. V =153.9D^2/Z+23.6 (R^2=0.919, SEE=15.7) where W = weight (kg), D = distance between both voltage electrodes (cm), Z = impedance (ohms), respectively. Furthermore, in a cross-validation analysis of prediction equations for the sample volume, another 38 pork samples were used. The volume estimated from each equation was highly correlated with the criterion variable. There were no significant differences between the mean volume obtained by the BI method and that by the criterion method. It is considered that practically, the D^2/Z index is information which is useful for the estimation of human local skeletal muscle by the BI method.
日本運動生理学会の論文
2003-10-27

豚肉を用いたBI法の基礎的研究

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