利用生物电阻抗测量人体脂肪的研究

USE OF BIOELECTRICAL IMPEDANCE MEASUREMENT FOR THE ASSESSMENT OF BODY FAT

本文根据瘦体组织电传导远比脂肪组织强的原理，研制了人体脂肪分析仪（ＢＦＡ），采用４个电极，引出无痛信号（８００μＡ、５０ｋＨｚ）进入人体，测试电阻抗（Ｚ），编入计算机软件，运算人体脂肪量。选择３０名１８～２０岁男性青年进行测量条件试验，得出食后半小时，上午、下午检测均可，喝少量水（少于５００ｍｌ）对测量无明显影响（Ｐ＞０．０５）。另选５２名受试者（男９，女４３）年龄１９～６５岁，对用ＢＦＡ测量的Ｚ、体脂百分比（％ＢＦ）和用美国ＢＣ一３００人体成分分析仪测量的电阻（Ｒ）、％ＢＦ进行了相关分析，ｒ值分别为０．９９５（Ｓ（ｙ．ｘ））＝７．９７，Ｐ＜０．０１）和０．９９６（Ｓ（ｙ．ｘ））＝０．６１，Ｐ＜０．０１）。最后，用ＢＦＡ对７９名健康人（男２２，女５７）、年龄３９．０±１１．８岁、身高１６３±７．０ｃｍ、体重６３．１±１０．２ｋｇ测量体脂，男性体脂２２．５±９．２％，女性体脂３４．７±７．２％，用体脂判断肥胖比用体重判断肥胖发生率高，特别是女人、中老年人更明显。

body fat analyzer(BFA)involving tlie measurement of bioelectrical impedance(Z)was described. It was based upon the principlc that the dectrical conductivity of the lean body mass was far greater than thatof fat. Determinations of Z for the estimation of fat with computer softwareWere made in 30 young men aged 18一20 y using an electrical impedance ple一thysmograph with a four一electrode arrangement that introduced a painlesssignal(800 μA at 50kHz) into the body. The measurements could be per-formed at about 0.5h after breakfast or lunch,Drinking a small amount ofwater(<500 ml) gave no distinct influcnce. The correlations between Z,percent body fat(%BF) by BFA and R,%BF by American BC-300 BodyComposition Analyzer were r=0.995(S(y.x)=7.97,P<0.01),r=0.996(S(y.x))=0.67, P<0. 01) respectively, in 52 suUects(9 men, 43 women) aged 16一65y.For males and females,%BF measured by BFA were 22.5±9.2, 34.7±7.2,rcspectively in 79 suUects(22 men and 57 wonien) aged 39.0±11.8y, 163±7.0 cm height and 63.1 ± 10.2kg weight.The obesity rate diagnosed by bodyfat was higher than by weight, more significatly for women and elderly.