Surface electrocardiogram (ECG) dataset recorded during relaxation in 70 healthy subjects

<strong>Study sample</strong> The sample consisted of 71 university students, average age 20.38 years (<em>SD</em> = 2.96), 78.8% female. Subjects with previous cardio-vascular disorders and irregular ECG were excluded (analysis was performed in 70 records). The study has been approved by the Institutional Review Board of the Department of Psychology, University of Belgrade No. 2018-19. All participants signed Informed Consents in accordance with the Declaration of Helsinki. In the course of visual examination, it was decided to discard ECG from one subject due to the presence of bigeminial arythmia, so further analysis was performed on 70 subjects instead of 71. <strong>Measurement setup</strong> BIOPAC sensors (Biopac Systems Inc., Camino Goleta, CA, USA) were used for recording biosignals in another study (Bjegojević et al., 2020). Here, we used only ECG signals recorded in sitting relaxed position from standard bipolar Lead I using the BIOPAC MP150 unit with AcqKnowledge software and ECG 100C module with surface H135SG Ag/AgCl electrodes (Kendall/Covidien, Dublin, Ireland). In order to decrease skin-electrode impedance, the skin was cleaned with Nuprep gel (Weaver &amp; Co., Aurora, USA) to reduce skin-electrode impedance. The sampling frequency was set at 2000 Hz and gain was set to 1000. <strong>Dataset and code contents</strong> ecg_70.txt, .txt data file, text format main.R, main program written in R programming language (will be published ...) analysis.R, code with analysis procedures written in R programming language (will be published ...) <strong>Citing instruction</strong> If you find these signals and code useful for your own research or teaching class, please cite both relevant dataset, paper, and paper under review as: Bjegojević, B., Milosavljević, N., Dubljević, O., Purić, D., &amp; Knežević, G. (2020). In pursuit of objectivity: Physiological measures as a means of emotion induction procedure validation. <em>XXIVI Scientific Conference on Empirical Studies in Psychology</em>, p. 17-19. Boljanić, T., Miljković, N., Lazarević B. Lj., Knežević, G., &amp; Milašinović, G. (2021). Surface electrocardiogram (ECG) dataset recorded during relaxation in 70 healthy subjects (Version 1) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.5599239 Boljanić, T., Miljković, N., Lazarević, B. Lj., Knežević, G., &amp; Milašinović, G. (2021). Relationship between electrocardiogram-based features and personality traits: Machine learning approach. <em>Annals of Noninvasive Electrocardiology</em>, under review.