The paper compares three systems for measuring electrodermal activity (EDA) under static and dynamic conditions: the BIOPAC MP150 with the EDA100C module, the wireless BIOPAC BioNomadix BN-PPGED system, and the wearable Senstream Research Ring. The aim was to evaluate how different electrode concepts, mechanical designs, and attachment methods affect the recorded skin conductance signal during rest, walking, and running. A repeated single-subject protocol was performed three times, with all three systems used simultaneously in each repetition. Signals were processed in Python using NeuroKit2, and the tonic skin conductance level (SCL), detected skin conductance response (SCR) peaks, SCL changes relative to rest, and Pearson correlations of tonic trends were analysed. The systems differed in absolute SCL values, signal stability, and sensitivity to motion. EDA100C detected a very high number of SCR peaks during running, indicating strong sensitivity to motion-related disturbances. The Senstream Research Ring showed lower absolute SCL values but a smoother tonic trend and greater temporal similarity to EDA100C than BioNomadix. This similarity reflects the time course of the tonic signal and does not by itself confirm measurement accuracy during movement.
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