Three-channel surface electrogastrogram (EGG) dataset recorded during fasting and post-prandial states in 20 healthy individuals

This repository contains Electrogastrography signals termed Electrogastrograms (EGG) recorded with surface Ag/AgCl electrodes placed over stomach and pre-processed in 20 healthy individuals (8 Females and 12 Males). The method for EGG recording and pre-processing together with subjects' data can be found in Popović et al. 2019. For each subject, EGG was recorded from three locations before (fasting state) and after (postprandial state) a commercial oat meal (274 kcal). Two 20 minutes recordings (files) are obtained for each subject - fasting and postprandial. Naming convention for files: <strong>subjects ID _ type of recording (fasting / postprandial)</strong>. Sample rate was set at 2 Hz and A/D card had 16 bits resolution. Gain of the amplifier was set at 1000. Overall, file size is 7200 samples (2400 samples for each channel). All signals were filtered with 3^rd order band-pass Butterworth filter with cut-off frequencies of 0.03 Hz and 0.25 Hz. In order to avoid phase distortion, zero-phase digital filtering was performed in Matlab R2013a by filtfilt() function. For convenient test download and appropriate preview, we provided all signals in .zip and sample signal for ID1 in .txt form. <strong>Dataset contents</strong> EGG-database.zip, data files, text format README.txt, metadata, text format ID1_fasting.txt and ID1_postprandial.txt, sample data files for subject ID1, text format <strong>Data files contain numerical values with decimal point according to the following structure</strong> column - CH1* (recorded samples from channel 1) column - CH2* (recorded samples from channel 2) column - CH3* (recorded samples from channel 3) * For exact anatomical locations for EGG channels CH1, CH2, and CH3, please refer to Popović et al. 2019. If you find these signals useful for your own research or teaching class, please cite both relevant paper and dataset as: Popović, N.B., Miljković, N. and Popović, M.B., 2019. Simple gastric motility assessment method with a single-channel electrogastrogram. <em>Biomedical Engineering/Biomedizinische Technik</em>, <em>64</em>(2), pp.177-185, doi: 10.1515/bmt-2017-0218. Popović, N.B., Miljković, N. and Popović, M.B., 2020. Three-channel surface electrogastrogram (EGG) dataset recorded during fasting and post-prandial states in 20 healthy individuals [Data set]. <em>Zenodo</em>, doi: 10.5281/zenodo.3730617.本仓库包含胃电图（Electrogastrograms, EGG）信号，该信号通过置于胃部的表面Ag/AgCl电极采集，并经过预处理，采集对象为20名健康受试者（8名女性，12名男性）。关于EGG的采集与预处理方法以及受试者数据，可参考Popović等人2019年的研究。 每名受试者在商用燕麦餐（274千卡）进食前（空腹状态）与进食后（餐后状态），分别于三个位置采集EGG信号。每名受试者可获得两份20分钟的录制文件——空腹状态文件与餐后状态文件。文件命名规则为：<strong>受试者ID_录制类型（fasting / postprandial，即空腹/餐后）</strong>。 采样率设置为2 Hz，模数转换（A/D）卡分辨率为16位，放大器增益设置为1000。单份文件总计包含7200个采样点（每个通道2400个采样点）。所有信号均采用3阶带通巴特沃斯（Butterworth）滤波器进行滤波，截止频率为0.03 Hz至0.25 Hz。为避免相位失真，使用Matlab R2013a中的filtfilt()函数完成零相位数字滤波。 为便于下载测试与预览，我们将所有信号打包为.zip格式文件，并提供ID1受试者的示例信号为.txt格式。<strong>数据集内容</strong>包括：EGG-database.zip、数据文件、文本格式README.txt、元数据，以及ID1受试者的空腹与餐后示例信号文件ID1_fasting.txt和ID1_postprandial.txt（均为文本格式）。<strong>数据文件结构如下</strong>： 列1为CH1（通道1采集的采样点），列2为CH2（通道2采集的采样点），列3为CH3（通道3采集的采样点）。 * 关于EGG通道CH1、CH2、CH3的具体解剖位置，请参考Popović等人2019年的研究。 若您的研究或教学课程中使用了本数据集，请引用以下两篇文献： Popović, N.B., Miljković, N. and Popović, M.B., 2019. Simple gastric motility assessment method with a single-channel electrogastrogram. *Biomedical Engineering/Biomedizinische Technik*, *64*(2), pp.177-185, doi: 10.1515/bmt-2017-0218. Popović, N.B., Miljković, N. and Popović, M.B., 2020. Three-channel surface electrogastrogram (EGG) dataset recorded during fasting and post-prandial states in 20 healthy individuals [Data set]. *Zenodo*, doi: 10.5281/zenodo.3730617.