ecg-polar-h10-set4

Single-lead ECG tracings along with heart rate and 3-axis chest actigraphy using a Polar H10 sensor worn with on a Polar Pro chest strap, with data transferred via bluetooth to an Android smartphone (Realme 6i) that serves as a bluetooth receptor unit and data recorder via the Polar Sensor Logger app on Android by Jukka Happonen (Polar developer, this app is unofficial): https://play.google.com/store/apps/details?id=com.j_ware.polarsensorlogger Data was compressed with 7-zip using LZMA2 in Normal compression setting and split into 5GB parts to respect the file size limit of figshare. Total is 11.4 GB compressed, 66 GB uncompressed. This dataset covers the period from 2021-07-12 to 2021-10-08, with a gap between 2021-08-21 to 2021-09-13 during which no data was acquired due to travelling. There is no overlap with previous sets, this is the continuation. See other sets for further data. This wearable was only worn when at home. Each file represents one acquisition session, of variable time up to 140h in one session. The acquisition software also split files when the device is temporarily out of reach, so there several files with very few entries, which means the device was barely reachable or went in and out of bluetooth range. These files can be concatenated to study a longer time period. There are 4 types of files: ECG for the raw ECG at 133Hz sampling rate, HR for the heart-rate computed by the proprietary Polar embedded software in the H10 sensor and also the IBI (inter-beats intervals) to ease calculation of HRV (heart rate variability), ACC for the 3-axis (accelerometer = translation axes) chest actigraphy set at 100Hz sampling rate and 4g sampling resolution, and Marker which are manual markers by the operator to mark special temporal events but they were not used for this study so they are either deleted or empty. For the full technical specification of the Polar H10 device, see: https://github.com/polarofficial/polar-ble-sdk/tree/master/technical_documentation

本数据集包含通过佩戴Polar Pro胸带的Polar H10传感器采集的单导联心电图（Electrocardiogram, ECG）波形记录、心率数据，以及三轴胸部活动描记数据。所有数据通过蓝牙传输至作为蓝牙接收与数据记录终端的Android智能手机Realme 6i，并由Jukka Happonen（Polar官方开发者，本应用为非官方软件）开发的Android端Polar Sensor Logger应用完成采集记录：https://play.google.com/store/apps/details?id=com.j_ware.polarsensorlogger

数据集采用7-Zip工具以LZMA2标准压缩模式（Normal压缩设置）进行压缩，并按照Figshare平台的文件大小限制拆分为5GB的分卷文件，总压缩体积为11.4GB，解压后总容量为66GB。

本数据集的覆盖时段为2021年7月12日至2021年10月8日，其中2021年8月21日至2021年9月13日期间因外出旅行未采集任何数据，存在数据空白。本数据集与此前发布的数据集无内容重叠，属于后续补充序列，如需获取更多相关数据可查阅其他数据集。

本穿戴设备仅在居家场景下佩戴。每个文件对应一次独立采集会话，单次会话时长可变，最长可达140小时。当采集设备暂时超出蓝牙通信范围时，采集软件会自动拆分文件，因此存在少量仅包含极少量数据条目的文件，这类情况对应设备几乎无法被正常连接，或频繁进出蓝牙通信范围。此类文件可通过拼接以分析更长时段的数据。

本数据集包含4类文件：
1. ECG类文件：采样率为133Hz的原始心电图波形数据；
2. HR类文件：由Polar H10传感器内置专有软件计算得到的心率数据，同时附带心搏间期（Inter-beats Interval, IBI）数据，以方便计算心率变异性（Heart Rate Variability, HRV）；
3. ACC类文件：三轴胸部活动描记数据（加速度计对应平移轴），采样率为100Hz，采样分辨率为4g；
4. Marker类文件：操作者手动标记的特殊时序事件标记，但本研究未使用此类数据，因此该类文件要么已被删除，要么为空内容。

如需查阅Polar H10设备的完整技术规范，请访问：https://github.com/polarofficial/polar-ble-sdk/tree/master/technical_documentation