chritron

• Bull, Emilie Meyer; Audunsdottir, Kristin; Jacobsen, Henrik Børsting; Kang, Heemin; Sartorius, Alina Marie & Glaser, Bernt Damian [Vis alle 13 forfattere av denne artikkelen] (2023). Heart Rate Variability and Pain: A Protocol for a Systematic Review and Meta-Analysis. OSF Preprints. doi: 10.31219/osf.io/arfm6.
• Tronstad, Christian; Amini, Maryam; Olesen, Eline; Qvigstad, Elisabeth; Pabst, Oliver & Martinsen, Tormod [Vis alle 11 forfattere av denne artikkelen] (2022). Diabetic foot assessment using skin impedance in a custom made sensor-sock. Journal of Electrical Bioimpedance. ISSN 1891-5469. 13(1), s. 136–142. doi: 10.2478/joeb-2022-0019. Fulltekst i vitenarkiv
• Tronstad, Christian; Pabst, Oliver; Amini, Maryam; Kleggetveit, Inge Petter; Elvebakk, Ole & Martinsen, Ørjan Grøttem [Vis alle 10 forfattere av denne artikkelen] (2022). Development of a prototype toe sensor for detection of diabetic peripheral small fiber neuropathy. Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). ISSN 2694-0604. doi: 10.1109/EMBC48229.2022.9871101.
• Azulay, Naomi; Bjørkholt Olsen, Roy; Nielsen, Christopher Sivert; Stubhaug, Audun; Jenssen, Trond Geir & Schirmer, Henrik [Vis alle 9 forfattere av denne artikkelen] (2022). Reduced heart rate variability is related to the number of metabolic syndrome components and manifest diabetes in the sixth Tromsø study 2007–2008. Scientific Reports. ISSN 2045-2322. 12. doi: 10.1038/s41598-022-15824-0. Fulltekst i vitenarkiv
• Hou, Jie; Strand-Amundsen, Runar James; Tronstad, Christian; Tønnessen, Tor Inge; Høgetveit, Jan Olav & Martinsen, Ørjan Grøttem (2022). Small intestinal viability assessment using dielectric relaxation spectroscopy and deep learning. Scientific Reports. ISSN 2045-2322. 12(1). doi: 10.1038/s41598-022-07140-4. Fulltekst i vitenarkiv
• Tronstad, Christian; Amini, Maryam; Bach, Dominik R. & Martinsen, Ørjan Grøttem (2022). Current trends and opportunities in the methodology of electrodermal activity measurement. Physiological Measurement. ISSN 0967-3334. 43(2). doi: 10.1088/1361-6579/ac5007.
• Strand-Amundsen, Runar James; Tronstad, Christian; Elvebakk, Ole; Martinsen, Tormod; Dybwad, Marius & Lingaas, Egil (2021). Quantification of aerosol dispersal from suspected aerosol-generating procedures. European Respiratory Journal Open Research (ERJ Open Research). ISSN 2312-0541. 7:00206-2021(4), s. 1–12. doi: 10.1183/23120541.00206-2021. Fulltekst i vitenarkiv
• Wiegerinck, Anouk; Thomsen, Andreas; Hisdal, Jonny; Kalvøy, Håvard & Tronstad, Christian (2021). Electrical impedance plethysmography versus tonometry to measure the pulse wave velocity in peripheral arteries in young healthy volunteers: a pilot study. Journal of Electrical Bioimpedance. ISSN 1891-5469. 12(1), s. 169–177. doi: 10.2478/joeb-2021-0020. Fulltekst i vitenarkiv
• Jacobsen, Fredrik Alstad; Hafli, Ellen Wold; Tronstad, Christian & Martinsen, Ørjan Grøttem (2021). Classification of emotions based on electrodermal activity and transfer learning - a pilot study. Journal of Electrical Bioimpedance. ISSN 1891-5469. 12(1), s. 178–183. doi: 10.2478/joeb-2021-0021. Fulltekst i vitenarkiv
• Singstad, Bjørn Jostein; Azulay, Naomi; Bjurstedt, Andreas; Bjørndal, Simen Chill; Flø Drageseth, Magnus & Austdal, Lars Peter Engeset [Vis alle 21 forfattere av denne artikkelen] (2021). Estimation of heart rate variability from finger photoplethysmography during rest, mild exercise and mild mental stress. Journal of Electrical Bioimpedance. ISSN 1891-5469. 12(1), s. 89–102. doi: 10.2478/joeb-2021-0012. Fulltekst i vitenarkiv
• Ibba, P.; Tronstad, Christian; Moscetti, R.; Mimmo, T.; Cantarella, G. & Petti, L. [Vis alle 8 forfattere av denne artikkelen] (2021). Supervised binary classification methods for strawberry ripeness discrimination from bioimpedance data. Scientific Reports. ISSN 2045-2322. 11. doi: 10.1038/s41598-021-90471-5.
• Haidl, Felix; Tronstad, Christian; Rosseland, Leiv Arne & Dahl, Vegard (2021). Maternal haemodynamics during labour epidural analgesia with and without adrenaline. Scandinavian Journal of Pain. ISSN 1877-8860. 21(4), s. 680–687. doi: 10.1515/sjpain-2020-0176. Fulltekst i vitenarkiv
• Hou, Jie; Strand-Amundsen, Runar James; Tronstad, Christian; Høgetveit, Jan Olav; Martinsen, Ørjan Grøttem & Tønnessen, Tor Inge (2021). Automatic prediction of ischemia-reperfusion injury of small intestine using convolutional neural networks: A pilot study. Sensors. ISSN 1424-8220. 21(19). doi: 10.3390/s21196691. Fulltekst i vitenarkiv
• Michelsen, Trond Melbye; Tronstad, Christian & Rosseland, Leiv Arne (2021). Blood pressure and cardiac output during caesarean delivery under spinal anaesthesia: A prospective cohort study. BMJ Open. ISSN 2044-6055. 11(6), s. 1–9. doi: 10.1136/bmjopen-2020-046102. Fulltekst i vitenarkiv
• Tronstad, Christian; Martinsen, Tormod; Olsen, Morten; Rosseland, Leiv Arne; Pettersen, Fred-Johan & Martinsen, Ørjan Grøttem [Vis alle 8 forfattere av denne artikkelen] (2020). Splitting one ventilator for multiple patients - a technical assessment. arXiv.org. ISSN 2331-8422.
• Bari, Dindar S.; Aldosky, Haval Y. Yacoob; Tronstad, Christian & Martinsen, Ørjan Grøttem (2020). The correlations among the skin conductance features responding to physiological stress stimuli. Skin Research and Technology. ISSN 0909-752X. s. 1–7. doi: 10.1111/srt.12989.
• Omenås, Ivar Nagelgaard; Tronstad, Christian & Rosseland, Leiv Arne (2020). Accuracy and trending abilities of finger plethysmographic blood pressure and cardiac output compared to invasive measurements during caesarean delivery in healthy women: An observational study. BMC Anesthesiology. ISSN 1471-2253. 20(157). doi: 10.1186/s12871-020-01078-8. Fulltekst i vitenarkiv
• Amini, Maryam; Niemi, Essi Maria; Hisdal, Jonny; Kalvøy, Håvard; Tronstad, Christian & Scholz, Hanne [Vis alle 8 forfattere av denne artikkelen] (2020). Monitoring the quality of frozen-thawed venous segments using bioimpedance spectroscopy . Physiological Measurement. ISSN 0967-3334. 41(4). doi: 10.1088/1361-6579/ab85b7. Fulltekst i vitenarkiv
• Tronstad, Christian & Strand-Amundsen, Runar James (2019). Possibilities in the application of machine learning on bioimpedance time-series. Journal of Electrical Bioimpedance. ISSN 1891-5469. 10(1), s. 24–33. doi: 10.2478/joeb-2019-0004.
• Tronstad, Christian; Høgetveit, Jan Olav; Elvebakk, Ole & Kalvøy, Håvard (2019). Age-related differences in the morphology of the impedance cardiography signal. Journal of Electrical Bioimpedance. ISSN 1891-5469. 10(1), s. 139–145. doi: 10.2478/joeb-2019-0020. Fulltekst i vitenarkiv
• Andersen, Jan-Hugo; Bjerke, Olav; Blakaj, Fatos; Flugsrud, Vilde Moe; Jacobsen, Fredrik Alstad & Jonsson, Marius [Vis alle 24 forfattere av denne artikkelen] (2019). Bioimpedance and NIR for non-invasive assessment of blood glucose. Journal of Electrical Bioimpedance. ISSN 1891-5469. 10, s. 133–138. doi: 10.2478/joeb-2019-0019.
• Martinsen, Ørjan Grøttem; Kalvøy, Håvard; Bari, Dindar S. & Tronstad, Christian (2019). A circuit for simultaneous measurements of skin electrical conductance, susceptance, and potential. Journal of Electrical Bioimpedance. ISSN 1891-5469. 10, s. 110–112. doi: 10.2478/joeb-2019-0016. Fulltekst i vitenarkiv
• Martinsen, Tormod; Pettersen, Fred-Johan; Kalvøy, Håvard; Tronstad, Christian; Kvarstein, Gunnvald & Bakken, André [Vis alle 10 forfattere av denne artikkelen] (2019). Electrosurgery and temperature increase in tissue with a passive metal implant. Frontiers in surgery. ISSN 2296-875X. 6:8, s. 1–8. doi: 10.3389/fsurg.2019.00008. Fulltekst i vitenarkiv
• Elvebakk, Ole; Tronstad, Christian; Birkeland, Kåre I.; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Gulseth, Hanne Løvdal [Vis alle 9 forfattere av denne artikkelen] (2019). A multiparameter model for non-invasive detection of hypoglycemia. Physiological Measurement. ISSN 0967-3334. 40(8), s. 1–14. doi: 10.1088/1361-6579/ab3676. Fulltekst i vitenarkiv
• Aria, Shafa; Elfarri, Yassine; Elvegård, Marius; Gottfridsson, Adam; Grønaas, Halvor & Harang, Sigve Smedsrud [Vis alle 25 forfattere av denne artikkelen] (2019). Measuring blood pulse wave velocity with bioimpedance in different age groups. Sensors. ISSN 1424-8220. 19:850(4), s. 1–10. doi: 10.3390/s19040850. Fulltekst i vitenarkiv
• Bjørhei, Andreas; Pedersen, Filip T.; Muhammad, Saeed; Tronstad, Christian; Kalvøy, Håvard & Wojniusz, Slawomir [Vis alle 8 forfattere av denne artikkelen] (2019). An investigation on bilateral asymmetry in electrodermal activity. Frontiers in Behavioral Neuroscience. ISSN 1662-5153. 13(88). doi: 10.3389/fnbeh.2019.00088. Fulltekst i vitenarkiv
• Tronstad, Christian; Elvebakk, Ole; Staal, Odd Martin; Kalvøy, Håvard; Høgetveit, Jan Olav & Jenssen, Trond Geir [Vis alle 8 forfattere av denne artikkelen] (2019). Non-invasive prediction of blood glucose trends during hypoglycemia. Analytica Chimica Acta. ISSN 0003-2670. 1052, s. 37–48. doi: 10.1016/j.aca.2018.12.009.
• Bari, D. S.; Aldosoky, H. Y. Y.; Tronstad, Christian; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2018). Electrodermal activity responses for quantitative assessment of felt pain. Journal of Electrical Bioimpedance. ISSN 1891-5469. 9, s. 52–58. doi: 10.2478/joeb-2018-0010. Fulltekst i vitenarkiv
• Strand-Amundsen, Runar James; Tronstad, Christian; Reims, Henrik Mikael; Reinholt, Finn P.; Høgetveit, Jan Olav & Tønnessen, Tor Inge (2018). Machine learning for intraoperative prediction of viability in ischemic small intestine. Physiological Measurement. ISSN 0967-3334. 39(10), s. 1–16. doi: 10.1088/1361-6579/aae0ea. Fulltekst i vitenarkiv
• Bari, Dindar S.; Aldosky, Haval Y. Yacoob; Tronstad, Christian; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2018). Influence of relative humidity on electrodermal levels and responses. Skin Pharmacology and Physiology. ISSN 1660-5527. 31, s. 298–307. doi: 10.1159/000492275.
• Elvebakk, Ole; Tronstad, Christian; Birkeland, Kåre I.; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Frøslie, Kathrine Frey [Vis alle 10 forfattere av denne artikkelen] (2018). Evaluation of hypoglycaemia with non-invasive sensors in people with type 1 diabetes and impaired awareness of hypoglycaemia. Scientific Reports. ISSN 2045-2322. 8:14722, s. 1–11. doi: 10.1038/s41598-018-33189-1. Fulltekst i vitenarkiv
• Strand-Amundsen, Runar James; Tronstad, Christian; Kalvøy, Håvard; Ruud, Tom Erik; Høgetveit, Jan Olav & Martinsen, Ørjan Grøttem [Vis alle 7 forfattere av denne artikkelen] (2018). Small intestinal ischemia and reperfusion - Bioimpedance measurements. Physiological Measurement. ISSN 0967-3334. 39(2). doi: 10.1088/1361-6579/aaa576. Fulltekst i vitenarkiv
• Bruehl, Stephen; Bjørkholt Olsen, Roy; Tronstad, Christian; Sevre, Knut; Burns, John W & Schirmer, Henrik [Vis alle 9 forfattere av denne artikkelen] (2018). Chronic pain-related changes in cardiovascular regulation and impact on comorbid hypertension in a general population: the Tromsø study. Pain. ISSN 0304-3959. 159(1), s. 119–127. doi: 10.1097/j.pain.0000000000001070. Fulltekst i vitenarkiv
• Bari, D. S.; Aldosky, H. Y. Y.; Tronstad, Christian; Kalvøy, Håvard & Martinsen, Ørjan Grøttem (2017). Electrodermal responses to discrete stimuli measured by skin conductance, skin potential, and skin susceptance. Skin Research and Technology. ISSN 0909-752X. 24(1), s. 108–116. doi: 10.1111/srt.12397.
• Kalvøy, Håvard; Tronstad, Christian; Ullensvang, Kyrre; Steinfeldt, Thorsten & Sauter, Axel Rudolf (2017). Detection of needle to nerve contact based on electric bioimpedance and machine learning methods. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. s. 9–12. doi: 10.1109/EMBC.2017.8036750.
• Tronstad, Christian; Elvebakk, Ole; Kalvøy, Håvard; Bjørgaas, Marit Ragnhild Rokne & Martinsen, Ørjan Grøttem (2017). Detection of sympathoadrenal discharge by parameterisation of skin conductance and ECG measurement. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. s. 3997–4000. doi: 10.1109/EMBC.2017.8037732.
• Pabst, Oliver; Tronstad, Christian & Martinsen, Ørjan Grøttem (2017). Instrumentation, electrode choice and challenges in human skin memristor measurement. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. s. 1844–1848. doi: 10.1109/EMBC.2017.8037205.
• Strand-Amundsen, Runar James; Reims, Henrik Mikael; Tronstad, Christian; Kalvøy, Håvard; Martinsen, Ørjan Grøttem & Høgetveit, Jan Olav [Vis alle 8 forfattere av denne artikkelen] (2017). Ischemic small intestine - In vivo versus ex vivo bioimpedance measurements. Physiological Measurement. ISSN 0967-3334. 38(5), s. 715–728. doi: 10.1088/1361-6579/aa67b7.
• Pabst, Oliver; Tronstad, Christian; Grimnes, Sverre; Fowles, Don C. & Martinsen, Ørjan Grøttem (2017). Comparison between the AC and DC measurement of electrodermal activity. Psychophysiology. ISSN 0048-5772. 54(3), s. 374–385. doi: 10.1111/psyp.12803.
• Nygaard, Kent Inge; Thiara, Amrit Paul Singh; Tronstad, Christian; Ringdal, Mari-Anne I Lindstein & Fiane, Arnt E (2016). VAVD vacuum may cause bubble transgression in membrane oxygenators. Perfusion. ISSN 0267-6591. 31(8), s. 648–652. doi: 10.1177/0267659116651345.
• Strand-Amundsen, Runar James; Tronstad, Christian; Kalvøy, Håvard; Gundersen, Yngvar; Krohn, Claus Danckert & Aasen, Ansgar Oddne [Vis alle 11 forfattere av denne artikkelen] (2016). In vivo characterization of ischemic small intestine using bioimpedance measurements. Physiological Measurement. ISSN 0967-3334. 37(2), s. 257–275. doi: 10.1088/0967-3334/37/2/257. Vis sammendrag

  The standard clinical method for the assessment of viability in ischemic small intestine is still visual inspection and palpation. This method is non-specific and unreliable, and requires a high level of clinical experience. Consequently, viable tissue might be removed, or irreversibly damaged tissue might be left in the body, which may both slow down patient recovery. Impedance spectroscopy has been used to measure changes in electrical parameters during ischemia in various tissues. The physical changes in the tissue at the cellular and structural levels after the onset of ischemia lead to time-variant changes in the electrical properties. We aimed to investigate the use of bioimpedance measurement to assess if the tissue is ischemic, and to assess the ischemic time duration. Measurements were performed on pigs (n  =  7) using a novel two-electrode setup, with a Solartron 1260/1294 impedance gain-phase analyser. After induction of anaesthesia, an ischemic model with warm, full mesenteric arterial and venous occlusion on 30 cm of the jejunum was implemented. Electrodes were placed on the serosal surface of the ischemic jejunum, applying a constant voltage, and measuring the resulting electrical admittance. As a control, measurements were done on a fully perfused part of the jejunum in the same porcine model. The changes in tan δ (dielectric parameter), measured within a 6 h period of warm, full mesenteric occlusion ischemia in seven pigs, correlates with the onset and duration of ischemia. Tan δ measured in the ischemic part of the jejunum differed significantly from the control tissue, allowing us to determine if the tissue was ischemic or not (P  <  0.0001, F  =  (1,75.13) 188.19). We also found that we could use tan δ to predict ischemic duration. This opens up the possibility of real-time monitoring and assessment of the presence and duration of small intestinal ischemia.

• Tronstad, Christian; Staal, Odd Martin; Saelid, Steinar & Martinsen, Ørjan Grøttem (2015). Model- based filtering for artifact and noise suppression with state estimation for electrodermal activity measurements in real time. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. s. 2750–2753. doi: 10.1109/EMBC.2015.7318961.
• Tronstad, Christian; Omenås, Ivar Nagelgaard & Rosseland, Leiv Arne (2015). An improved artifact removal algorithm for continuous cardiac output and blood pressure recordings. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. ISSN 1557-170X. 2015-November, s. 5968–5972. doi: 10.1109/EMBC.2015.7319751.
• Martinsen, Ørjan Grøttem; Pabst, Oliver; Tronstad, Christian & Grimnes, Sverre (2015). Sources of error in AC measurement of skin conductance. Journal of Electrical Bioimpedance. ISSN 1891-5469. 6(1), s. 49–53. doi: 10.5617/jeb.2640.
• Pischke, Søren Erik; Hyler, Stefan; Tronstad, Christian; Bergsland, Jacob; Fosse, Erik & Halvorsen, Per Steinar [Vis alle 8 forfattere av denne artikkelen] (2015). Myocardial tissue CO2 tension detects coronary blood flow reduction after coronary artery bypass in real-time. British Journal of Anaesthesia. ISSN 0007-0912. 114(3), s. 414–422. doi: 10.1093/bja/aeu381.
• Tronstad, Christian; Helsing, Per; Tønseth, Kim Aleksander; Grimnes, Sverre & Polesie, Anne Lene Krogstad (2014). Tumescent suction curettage vs. curettage only for treatment of axillary hyperhidrosis evaluated by subjective and new objective methods. Acta Dermato-Venereologica. ISSN 0001-5555. 94(2), s. 215–220. doi: 10.2340/00015555-1671.
• Nordbotten, Bernt Jørgen; Tronstad, Christian; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2014). Estimation of skin conductance at low frequencies using measurements at higher frequencies for EDA applications. Physiological Measurement. ISSN 0967-3334. 35(6), s. 1011–1018. doi: 10.1088/0967-3334/35/6/1011.
• Tronstad, Christian & Pripp, Are Hugo (2014). Statistical methods for bioimpedance analysis. Journal of Electrical Bioimpedance. ISSN 1891-5469. 5(1), s. 14–27. doi: 10.5617/jeb.830.
• Tronstad, Christian; Kalvøy, Håvard; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2013). Waveform difference between skin conductance and skin potential responses in relation to electrical and evaporative properties of skin. Psychophysiology. ISSN 0048-5772. 50(11), s. 1070–1078. doi: 10.1111/psyp.12092.
• Tronstad, Christian; Kalvøy, Håvard; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2013). Improved Estimation of Sweating Based on Electrical Properties of Skin. Annals of Biomedical Engineering. ISSN 0090-6964. 41(5), s. 1074–1083. doi: 10.1007/s10439-013-0743-4.
• Pischke, Søren Erik; Tronstad, Christian; Holhjem, Lars; Halvorsen, Per Steinar & Tønnessen, Tor Inge (2012). Perioperative detection of myocardial ischaemia/reperfusion with a novel tissue CO2 monitoring technology. European Journal of Cardio-Thoracic Surgery. ISSN 1010-7940. 42(1), s. 157–163. doi: 10.1093/ejcts/ezr278.
• Pischke, Søren Erik; Tronstad, Christian; Holhjem, Lars; Line, Pål Dag; Haugaa, Håkon & Tønnessen, Tor Inge (2012). Hepatic and Abdominal Carbon Dioxide Measurements Detect and Distinguish Hepatic Artery Occlusion and Portal Vein Occlusion in Pigs. Liver transplantation. ISSN 1527-6465. 18(12), s. 1485–1494. doi: 10.1002/lt.23544.
• Nordbotten, Bernt Jørgen; Tronstad, Christian; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2011). Evaluation of algorithms for calculating bioimpedance phase angle values from measured whole-body impedance modulus. Physiological Measurement. ISSN 0967-3334. 32(7), s. 755–765. doi: 10.1088/0967-3334/32/7/S03.
• Grimnes, Sverre; Jabbari, Azar; Martinsen, Ørjan Grøttem & Tronstad, Christian (2011). Electrodermal activity by DC potential and AC conductance measured simultaneously at the same skin site. Skin Research and Technology. ISSN 0909-752X. 17(1), s. 26–34. doi: 10.1111/j.1600-0846.2010.00459.x.
• Tronstad, Christian; Pischke, Søren Erik; Holhjem, L; Tønnessen, Tor Inge; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2010). Early detection of cardiac ischemia using a conductometric pCO(2) sensor: real-time drift correction and parameterization. Physiological Measurement. ISSN 0967-3334. 31(9), s. 1241–1255. doi: 10.1088/0967-3334/31/9/013.
• Kalvøy, Håvard; Tronstad, Christian; Nordbotten, Bernt Jørgen; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2010). Electrical Impedance of Stainless Steel Needle Electrodes. Annals of Biomedical Engineering. ISSN 0090-6964. 38(7), s. 2371–2382. doi: 10.1007/s10439-010-9989-2.
• Tronstad, Christian; Johnsen, Gorm Krogh; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2010). A study on electrode gels for skin conductance measurements. Physiological Measurement. ISSN 0967-3334. 31(10), s. 1395–1410. doi: 10.1088/0967-3334/31/10/008.
• Tronstad, Christian; Grimnes, Sverre; Martinsen, Ørjan Grøttem; Amundsen, Vegar & Wojniusz, Slawomir (2010). PC-based instrumentation for electrodermal activity measurement. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 224. doi: 10.1088/1742-6596/224/1/012093. Vis sammendrag

  A PC-based EDA measuring system is presented. The system is composed of a laptop with a PCMCIA DAQ-card running LabVIEW® software, a small front-end with a dual op-amp IC and a few passive components, and three skin-surface electrodes. The electrode system gives a monopolar measurement below the measuring electrode regardless of the electrode sizes, unless very small. Usage of the system is demonstrated by measurements from a mental stress experiment on 17 volunteers. There was a significant correlation (R=0.51, p<0.001) between the self-assessed stress-level and the EDA response frequency. The system allows easy on-site customization in software of measuring parameters, signal-quality monitoring and non-linearity detection in real time. We believe that the most suited use for the system is for stationary experimental purposes where this flexibility is desired. The system is easy to reproduce by engineers interested in doing EDA research.

Se alle arbeider i Cristin

• Hou, Jie; Nesaragi, Naimahmed & Tronstad, Christian (2024). Electrical bioimpedance in the era of artificial intelligence. Journal of Electrical Bioimpedance. ISSN 1891-5469. 15(1), s. 1–3. doi: 10.2478/joeb-2024-0001.
• Kildal, Emilie Smith-Meyer; Quintana, Daniel; Szabo, Attila; Tronstad, Christian; Andreassen, Ole & Nærland, Terje (2023). Heart rate monitoring to detect acute pain in non-verbal patients: a study protocol for a randomized controlled clinical trial. BMC Psychiatry. ISSN 1471-244X. 23(1). doi: 10.1186/s12888-023-04757-1. Fulltekst i vitenarkiv
• Elvebakk, Ole; Tronstad, Christian; Birkeland, Kåre Inge; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Frøslie, Kathrine Frey [Vis alle 10 forfattere av denne artikkelen] (2019). Author Correction: Evaluation of Hypoglycaemia with Non-Invasive Sensors in People with Type 1 Diabetes and Impaired Awareness of Hypoglycaemia (Scientific Reports, (2018), 8, 1, (14722), 10.1038/s41598-018-33189-1). Scientific Reports. ISSN 2045-2322. 9(1). doi: 10.1038/s41598-019-42218-6.
• Kalvøy, Håvard; Sauter, Axel Rudolf; Tronstad, Christian & Martinsen, Ørjan Grøttem (2016). Neural tissue discrimination with machine learning methods. Proceedings of the 16th International Conference on Electrical Bioimpedance.
• Pabst, Oliver; Tronstad, Christian; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2016). Comparison between AC and DC exosomatic EDA measuring methods. Proceedings of the 16th International Conference on Electrical Bioimpedance.
• Strand-Amundsen, Runar James; Tronstad, Christian; Martinsen, Ørjan Grøttem; Høgetveit, Jan Olav; Ruud, TE & Tønnessen, Tor Inge (2016). Bioimpedance - in vivo vs in vitro ischemic small intestine. Proceedings of the 16th International Conference on Electrical Bioimpedance.
• Tronstad, Christian; Elvebakk, Ole; Martinsen, Ørjan Grøttem; Kalvøy, Håvard & Høgetveit, Jan Olav (2016). Bioimpedance for prediction of hypoglycemic trends. Proceedings of the 16th International Conference on Electrical Bioimpedance.
• Elvebakk, Ole; Tronstad, Christian; Gulseth, Hanne Løvdal; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Høgetveit, Jan Olav [Vis alle 8 forfattere av denne artikkelen] (2015). Physiological and symptomatic responses to hypoglycemia in patients with impaired awareness.
• Tronstad, Christian; Staal, Odd Martin; Sælid, Steinar & Martinsen, Ørjan Grøttem (2015). Model-based filtering for artifact and noise suppression with state estimation for electrodermal activity measurements in real time .
• Nordbotten, Bernt Jørgen; Tronstad, Christian; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2013). Estimation of skin conductance at low frequencies from measurements at higher frequencies for EDA application.
• Tronstad, Christian; Kalvøy, Håvard; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2013). Sweat production estimated by bioimpedance and bioelectrical signals.
• Kalvøy, Håvard; Tronstad, Christian; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2013). Simultaneous measurement of DC potential and AC conductance to monitor electrodermal activity at a single electrode.
• Elvebakk, Ole; Tronstad, Christian; Høgetveit, Jan Olav; Jenssen, Trond Geir; Bjørgaas, Marit & Martinsen, Ørjan Grøttem (2013). Sweating reactions due to hypoglycemia detected by skin AC conductance.
• Tronstad, Christian; Elvebakk, Ole; Høgetveit, Jan Olav; Jenssen, Trond Geir; Bjørgaas, Marit Ragnhild Rokne & Martinsen, Ørjan Grøttem (2013). Monitoring of sweat activity for detection of severe hypoglycemia – A pilot study.
• Kvaløy, Håvard; Tronstad, Christian; Grimnes, Sverre & Martinsen, Ørjan Grøttem (2012). Electrodermal activity measured as DC potential and AC conductance at the same electrode. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. 39.
• Tronstad, Christian; Kvaløy, Håvard; Martinsen, Ørjan Grøttem & Grimnes, Sverre (2012). New parameters of electrodermal activity and estimation of sweat production. International Federation for Medical and Biological Engineering Proceedings. ISSN 1680-0737. 39.
• Pabst, Oliver; Martinsen, Ørjan Grøttem; Tronstad, Christian & Wilson, Steven Ray Haakon (2018). Electrical properties of human skin: From linear recordings of exogenous electrodermal activity to non-linear memristor measurements. Universitetet i Oslo. ISSN 1501-7710. 2018(1971).
• Tronstad, Christian (2012). Developments in biomedical sensors based on electrical impedance- Improvements in electrodes, instrumentation and signal processing technology for new and existing biomedical sensors for clinical use. Det matematisk naturvitenskapelige fakultet.

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