Reliability and Device Comparison of a Newly Developed Surface Electromyography Device: A Preliminary Study on Healthy Adults

Purpose: This study aimed to evaluate the reliability of a newly developed wireless surface electromyography (sEMG) device by comparing it to an existing commercial sEMG system in healthy adults.Methods: Twenty healthy adults participated in the study.The sEMG signals were recorded using a newly developed wireless sEMG device (K-sEMG40) and a commercial system (BTS-FREEEMG1000) during maximal voluntary isometric contraction (MVIC) and submaximal contractions (40% and 80% MVIC).Reliability and agreement were assessed using intraclass correlation coefficients (ICC), Spearman's correlation, Bland-Altman analysis, and effect size calculation. Results:The developed device showed high reliability (ICC > 0.85) for MVIC and 40% MVIC, with moderate reliability at 80% MVIC.Strong correlations (r > 0.86, p < 0.01) were found between the two devices.The Bland-Altman analysis demonstrated good agreement, and the effect size analysis indicated small differences between measurements. Conclusion:The newly developed wireless sEMG device demonstrated high reliability and agreement with the existing