Extracellular and intracellular volume variations during postural change measured by segmental and wrist-ankle bioimpedance spectroscopy
Extracellular and intracellular volume variations during postural change measured by segmental and wrist-ankle bioimpedance spectroscopy
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DOI：
10.1109/tbme.2003.820338
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发表时间：
2004-01-01
影响因子：
4.6
通讯作者：
Jaffrin, MY
中科院分区：
文献类型：
--
作者：
Fenech, M;Jaffrin, MY
用节段性和腕踝(W-A)生物阻抗谱(5-1000 kHz)测量15例健康受试者(男7例，女8例)的细胞外体积(ECW)和细胞内体积(ICW)。在第一个方案中，受试者在坐30分钟后，仰卧至少30分钟。在第二个方案中，受试者仰卧1小时，在床上坐10分钟，然后恢复仰卧位1小时。在手腕、肩部、大腿上端和脚踝放置四个电压电极，利用Hanai的电导理论，测量腿部、手臂和躯干的节段性ECW和ICW电阻。W-A电阻与分段电阻之和非常接近。从坐位转为仰卧位时(方案1)，平均ECW腿阻力增加18.2%，手臂和W-A增加12.4%。树干阻力也有所增加，但增幅不大，为4.8%。ICW阻力的相应增加在腿部(3.7%)和手臂(-0.7%)较小，但在躯干(21.4%)较大。从节段性测量得到的全身ECW体积与W-A和Watson拟人化相关很好地吻合。根据节段阻力计算的ECW总体积减少(仰卧位时)为0.79 1，小于W-A(1.121)。ICW总体积减少3.4%(节段性)和3.8%(W-A)。方案2的试验证实，阻力和液体体积值不受临时位置改变的影响。
Extracellular (ECW) and intracellular (ICW) volumes were measured using both segmental and wrist-ankle (W-A) bioimpedance spectroscopy (5-1000 kHz) in 15 healthy subjects (7 men, 8 women). In the 1st protocol, the subject, after sitting for 30 min, laid supine for at least 30 min. In the second protocol, the subject, who had been supine for 1 hr, sat up in bed for 10 min and returned to supine position for another hour. Segmental ECW and ICW resistances of legs, arms and trunk were measured by placing four voltage electrodes on wrist, shoulder, top of thigh and ankle and using Hanai's conductivity theory. W-A resistances were found to be very close to the sum of segmental resistances. When switching from sitting to supine (protocol 1), the mean ECW leg resistance increased by 18.2 %, that of arm and W-A by 12.4 %. Trunk resistance also increased but not significantly by 4.8 %. Corresponding increases in ICW resistance were smaller for legs (3.7 %) and arm (- 0.7 %) but larger for the trunk (21.4 %). Total body ECW volumes from segmental measurements were in good agreement with W-A and Watson anthropomorphic correlation. The decrease in total ECW volume (when supine) calculated from segmental resistances was at 0.79 1 less than the W-A one (1.12 1). Total ICW volume reductions were 3.4% (segmental) and 3.8% (W-A). Tests of protocol 2 confirmed that resistance and fluid volume values were not affected by a temporary position change.