General characteristics of the population and experimental conditions during protocol 1 and protocol 2.

BMI means Body mass index; bpm means beat per minute. Protocol 1 corresponds to ACh iontophoresis with a single current stimulation (0.1 mA, 30 s). Protocol 2 corresponds to ACh iontophoresis with a multiple current stimulations (four stimulations of 0.1 mA, 10 s with a 2 minute free interval). Protocol 1 and 2 were performed on separated days. Laser head distance was the distance between the laser speckle head and the skin. P means p value. NS means non significant.BMI即身体质量指数（Body mass index），bpm指每分钟心搏次数（beat per minute）。方案1对应单次电流刺激的乙酰胆碱（ACh）离子导入疗法，刺激参数为0.1 mA，持续30秒。方案2对应多次电流刺激的乙酰胆碱（ACh）离子导入疗法，共进行4次刺激，每次参数为0.1 mA、持续10秒，各次刺激间设置2分钟的间歇期。方案1与方案2的实验分别在不同日期完成。激光探头间距指激光散斑探头与皮肤之间的距离。P代表P值，NS代表无统计学意义（non significant）。