Intra-subject reproducibility at a 7-day interval of ACh vasodilation with a single current stimulation measured either using LSCI or LDF.

The parameters of the maximal ACh vasodilation measurement obtained after current application are presented in Table 1. Time to peak corresponds to the time after the end of the current stimulation until the maximal acetylcholine vasodilation is reached. Typical error of the estimate (TEE) of the cutaneous blood flow expressed in au or LSPU when (absolute) is mentioned and in au/mmHg or LSPU/mmHg when CVC is mentioned. Intra-CV means intra-subject coefficient of variation. ICC means intra-class correlation. Results are mean with 95% confidence interval [95%]. The lower the intra-CV, the better the reproducibility. ICC values of >0.75, 0.75 to 0.60, 0.59 to 0.40, and

表1展示了施加电流后测得的最大乙酰胆碱（acetylcholine, ACh）血管舒张相关参数。达峰时间指电流刺激结束后，直至达到最大乙酰胆碱血管舒张效应所需的时长。皮肤血流量估计值的标准误（typical error of the estimate, TEE）以任意单位（arbitrary unit, au）或激光散斑灌注单位（laser speckle perfusion unit, LSPU）表示：当标注「绝对（值）」时，采用au或LSPU为单位；当提及皮肤血管电导（cutaneous vascular conductance, CVC）时，则采用au/mmHg或LSPU/mmHg为单位。Intra-CV即受试者内变异系数（intra-subject coefficient of variation），ICC即组内相关系数（intra-class correlation）。结果以均值及95%置信区间[95%CI]的形式呈现。受试者内变异系数越低，实验的可重复性越好。ICC值可分为>0.75、0.75~0.60、0.59~0.40，以及