Reliability of the Prognos electrodermal device for measurements of electrical skin resistance at acupuncture points.
Reliability of the Prognos electrodermal device for measurements of electrical skin resistance at acupuncture points.
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Prognos 皮肤电设备测量针灸点皮肤电阻的可靠性。
DOI：
10.1089/acm.2004.10.610
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
McNames,James
中科院分区：
文献类型：
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作者：
Colbert,AgathaP;Hammerschlag,Richard;Aickin,Mikel;McNames,James
目的：(1)对一种电致皮肤筛查装置Prognos进行表征和校准。(2)重复先前对该装置的重测可靠性研究，测量24个井穴的皮肤电阻(ESR)。单位：俄勒冈东方医学院和波特兰州立大学，俄勒冈州波特兰州立大学。仪器：Prognos设备由波特兰州立大学生物医学信号处理实验室的一组研究工程师进行电学表征。他们确定，Prognos测量了金属腕带和电极探头之间的平均直流(DC)电阻。探头尖端连接到线性弹簧，设置为在2.62 mm的偏转处使用光学产生的信号触发，对应于2.68±0.04 N的平均作用力(平均值±标准差[SD]，n=6)。他们还确定，该器件通过施加平均223±3毫秒(n=7)的1.1微安电流来量化电阻。研究对象：31名健康志愿者，17名女性，14名男性，年龄23-63岁。可靠性测试结果：单次测量的平均可靠性为：24个井井AP的四次连续扫描的标准测量方案的平均可靠性为0.758；墨水标记AP后的四次连续扫描的标准测量方案为0.851；每个墨迹AP的四次快速重复测量的可靠性为0.961。血沉的绝对值平均值在标准方案和标记方案之间降低，但在标记方案和快速重复方案之间没有下降。结论：Prognos在报告的ESR范围内与已知电阻相比，表现准确。标准方案的可靠性(r=0.758)与其他研究人员在类似条件下证明的0.721的可靠性相当。标记AP并按快速顺序进行测量，可提高ESR测量的可靠性。第二和第三种方案中可靠性的提高与平均ESR值的降低有关，这可能与Prognos探针放置和/或墨化AP的准确性提高有关。
Objectives: (1) To characterize and calibrate an electrodermal screening device, Prognos. (2) To replicate a previous test–retest reliability study of this device with measurements of electrical skin resistance (ESR) at 24 Jing-well acupuncture points (APs). (3) To determine measurement precision in three successively more exacting trial protocols on the same set of subjects.Settings: Oregon College of Oriental Medicine and Portland State University, Portland, OR.Instruments: The Prognos device was electrically characterized by a team of research engineers at the Biomedical Signal Processing Laboratory of Portland State University. They determined that Prognos measures the average direct-current (DC) resistance between a metallic wrist strap and an electrode probe tip. The probe tip is connected to a linear spring set to trigger with an optically generated signal at a deflection of 2.62 mm, which corresponds to an average applied force of 2.68 ± 0.04 N (mean ± standard deviation [SD], n = 6). They also determined that the device quantifies resistance by applying a 1.1 µA current for an average of 223 ± 3 ms (n = 7). When calibrated against a series of known resistors, Prognos measures accurately in the range of 150 kΩ to 14.3 MΩ with an error of less than 0.4%.Subjects: Thirty-one (31) healthy volunteers, 17 females and 14 males, 23–63 years of age.Results of reliability test–retest: The mean reliability of a single measurement was; 0.758 for a standard measurement protocol of four sequential sweeps of 24 Jing-well (Ting) APs; 0.851 for four sequential sweeps after ink-marking the APs; and 0.961 for four rapid repeat measurements at each inked AP. Mean absolute values of ESR decreased between the standard and marked protocols, but not between the marked and rapid repeat protocols.Conclusions: Prognos performs accurately, against known resistors over the reported range of ESR. The reliability in the standard protocol (r = 0.758) is comparable to the reliability of 0.721 demonstrated under similar conditions by other investigators. Marking APs, and performing measurements in a rapid sequence, increases reliability of ESR measurements. Increased reliability in the second and third protocols is associated with decreased mean ESR values which may be related to increased accuracy of Prognos probe placement and/or inking the APs.