Levitan B M, Montgomery L D, Bhagat P K, Zieglschmid J F
Aviat Space Environ Med. 1983 Jan;54(1):6-10.
Comparisons of a Whitney mercury-filled double-stranded strain gauge with two plethysmographs proposed for Shuttle use--an ultrasound and an impedance plethysmograph--were performed on 20 subjects. An occlusive thigh pressure cuff, inflated to 50 mm Hg, caused partial venous occlusion and subsequent blood pooling distal to the cuff. The average maximum volume changes observed in the Whitney/ultrasound test were 2.07% and 3.35%, respectively, and 2.12% and 2.53% for the Whitney/impedance comparison. Applying the ratio of the maximum volume changes to the gain of each test system caused the impedance and ultrasound volume change determinations to be essentially identical to the Whitney gauge. The three different limb parameters measured result in significant magnitude differences but the three systems track their respective changes identically.
对20名受试者进行了惠特尼充汞双链应变计与两种拟用于航天飞机的体积描记器（一种超声体积描记器和一种阻抗体积描记器）的比较。一个充气至50毫米汞柱的大腿阻塞性压力袖带导致部分静脉阻塞，随后在袖带远端出现血液淤积。在惠特尼/超声测试中观察到的平均最大体积变化分别为2.07%和3.35%，在惠特尼/阻抗比较中为2.12%和2.53%。将最大体积变化与每个测试系统增益的比值应用后，阻抗和超声体积变化测定结果与惠特尼应变计基本相同。所测量的三个不同肢体参数在幅度上存在显著差异，但这三个系统对各自变化的跟踪情况相同。
