# A Chest Strap-Based System for Electrocardiogram Monitoring
## 5 Conclusions  
In this work, we propose a wearable ECG monitoring system utilizing cotton fiber cloth sewn with silver-coated polyamide yarn as bioelectrodes. The CEMS is specifically designed to overcome the limitations of conventional ECG monitoring devices, which often restrict users' daily activities. The system offers an effective solution for the continuous monitoring of ECG signals during various daily activities while also serving as a tool for assessing exercise intensity. The CEMS features a chest strap design, which allows it to be comfortably worn on the human body and ensures accurate ECG signal capture without hindering the user's movement. The built-in high-efficiency filter effectively removes various sources of noise, such as industrial frequency interference, while retaining the essential information of the ECG signal. This ensures high-quality signal capture even in challenging environments. The bioelectrode used in the CEMS, the STE, adheres closely to the skin, ensuring comfort and breathability. When wetted by sweat, it demonstrates lower contact impedance compared to conventional Ag/AgCl gel electrodes, which enhances its performance and durability. Furthermore, based on the high-quality ECG signals collected by the system, an exercise intensity classification model was developed. After 100 training epochs, the model achieved an impressive accuracy of 98.7%, showcasing the potential of the CEMS in real-world applications. Due to its high portability and comfortable wearability, the CEMS is anticipated to serve as a significant driving force in the development of physiological signal monitoring technologies. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Product** & **EkgMove** & \begin{tabular}{c} **Underwear with** \\ **12 Channels** \\ \end{tabular} & **CHILEAF** & **CEMS** \\ \hline \begin{tabular}{c} Wearing Style \\ Electrode \\ \end{tabular} & \begin{tabular}{c} Chest strap \\ Disposable ECG \\ electrode \\ \end{tabular} & \begin{tabular}{c} Underwear \\ \end{tabular} & \begin{tabular}{c} Chest strap \\ Conventional metal \\ electrode \\ \end{tabular} & \begin{tabular}{c} Chest strap \\ Silver-coated \\ textile electrode \\ \end{tabular} \\ \
\begin{tabular}{c} Sweat-proof \\ performance \\ \end{tabular} & NO & YES & YES \\
\begin{tabular}{c} Wearability \\ \end{tabular} & YES & NO & YES & YES \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Performance comparison of different ECG monitoring devices. **Author Contributions:** X.Z. : investigation, writing--original draft, methodology, visualization, funding acquisition. Y.Z. : investigation, data curation, visualization. X.W. : conceptualization, supervision, project administration, funding acquisition. J.Y. : conceptualization, supervision, project administration, funding acquisition. All authors have read and agreed to the published version of the manuscript. **Funding:** This research was funded by the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202400560), the Natural Science Foundation of Chongqing (Grant No. CSTB2024 NSCQ-MSX0888), the Dr. Scientific Research Fund of Chongqing Normal University (23 XLB014), the Fundamental Research Funds for the Central Universities (2024 CDJYXTD-004), the Natural Science Foundation Projects of Chongqing (cstc2022 ycjh-bgzxm0206), and the Chongqing Natural Science Foundation Innovation and Development Joint Fund (CSTB2023 NSCQ-IZX0063). **Institutional Review Board Statement:** The study involved human participants but was non-invasive and conducted with the informed consent of all subjects. Data were collected anonymously in accordance with national ethical guidelines, and the protocol qualified for exemption from full ethical review. An exemption was granted by the Institutional Review Board of the School of Physics and Electronic Engineering, Chongqing Normal University (exemption issued on 28 March 2025).