Validity of hand-to-foot measurement of bioimpedance: Standing compared with lying position
Validity of hand-to-foot measurement of bioimpedance: Standing compared with lying position
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DOI：
10.1038/oby.2006.32
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发表时间：
2006-02-01
期刊：
影响因子：
6.9
通讯作者：
Luke, Amy
中科院分区：
文献类型：
--
作者：
Rush, Elaine C.;Crowley, Jennifer;Luke, Amy
目的：比较站立和卧位测量手足生物阻抗的可靠性。研究方法和方法：在不同体型范围内，对205名6~年龄的志愿者(男111人，女94人)进行体位、时间和年龄对手足生物阻抗的影响。在一个较小的子集(n=10)中还记录了站立时间对阻力的影响，在另一个子集(n=12)中记录了在一天的同一时间重复测量超过3d。结果：卧位阻抗始终高于立位，5~14岁儿童的关系(卧位/站立阻力)为1.031，而60岁儿童的比率为1.016。静置状态下的时间确实改变了阻力测量--站立10分钟最多减少9欧米加(平均5欧米加，1.0%)，躺着时增加最多7欧米加(平均3欧米加，0.7%)。讨论：在野外，可以在站立位置测量手脚生物阻抗，经过适当调整，可以使用先前验证的卧位方程。考虑到身高和体重的测量误差也会影响从生物电导得出身体脂肪的可靠性，所以更实际的站立测量而不是撒谎产生的误差可能是最小的。
Objective: To assess the reliability of the standing measurement of hand-to-foot bioimpedance compared with measurements made in the lying position.Research Methods and Procedures: In 205 volunteers 6 to 89 years of age, 111 males and 94 females from six ethnic groups, effects of posture, time, and age on hand-to-foot resistance were studied over a range of body size. The effect of time in a position on resistance was also recorded in a small subset (n = 10), and repeat measurements over 3 days at the same time of the day were recorded in another subset (n = 12).Results: Lying impedance was consistently higher than standing, with the relationship (resistance lying/resistance standing) for the children (5 to 14 years) being 1.031, progressing to a ratio of 1.016 in those >60 years. The time spent static in either position did change resistance measurements - a decrease of up to 9 Omega (mean 5 Omega, 1.0%) over 10 minutes of standing and an increase of up to 7 Omega (mean 3 Omega, 0.7%) with lying.Discussion: In the field, measurements of hand-to-foot bioimpedance can be made in the standing position, and, with appropriate adjustment, previously validated recumbent equations can be used. Given that errors in the measurement of height and weight also affect the reliability of the derivation of body fat from bioelectrical conductance, the errors that may arise from a more practical standing measurement rather than lying are minimal.