{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:53:41Z","timestamp":1760151221653,"version":"build-2065373602"},"reference-count":64,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2022,2,22]],"date-time":"2022-02-22T00:00:00Z","timestamp":1645488000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia","doi-asserted-by":"publisher","award":["UIDB\/00066\/2020 (FCT)"],"award-info":[{"award-number":["UIDB\/00066\/2020 (FCT)"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004410","name":"Scientific and Technological Research Council of Turkey","doi-asserted-by":"publisher","award":["TUBITAK-BIDEB\/2219-Program granted"],"award-info":[{"award-number":["TUBITAK-BIDEB\/2219-Program granted"]}],"id":[{"id":"10.13039\/501100004410","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The uterine electromyogram, also called electrohysterogram (EHG), is the electrical signal generated by uterine contractile activity. The EHG has been considered an expanding technique for pregnancy monitoring and preterm risk evaluation. Data were collected on the abdominal surface. It has been speculated the effect of the placenta location on the characteristics of the EHG. In this work, a preliminary exploration method is proposed using the average spectra of Alvarez waves contractions of subjects with anterior and non-anterior placental position as a basis for the triple-dispersion Cole model that provides a best fit for these two cases. This leads to the uterine impedance estimation for these two study cases. Non-linear least square fitting (NLSF) was applied for this modelling process, which produces electric circuit fractional models\u2019 representations. A triple-dispersion Cole-impedance model was used to obtain the uterine impedance curve in a frequency band between 0.1 and 1 Hz. A proposal for the interpretation relating the model parameters and the placental influence on the myometrial contractile action is provided. This is the first report regarding in silico estimation of the uterine impedance for cases involving anterior or non-anterior placental positions.<\/jats:p>","DOI":"10.3390\/s22051704","type":"journal-article","created":{"date-parts":[[2022,2,22]],"date-time":"2022-02-22T22:35:00Z","timestamp":1645569300000},"page":"1704","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A Preliminary Exploration of the Placental Position Influence on Uterine Electromyography Using Fractional Modelling"],"prefix":"10.3390","volume":"22","author":[{"given":"M\u00fcfit","family":"\u015ean","sequence":"first","affiliation":[{"name":"Department of Mathematics, \u00c7ank\u0131r\u0131 Karatekin University, \u00c7ank\u0131r\u0131 18100, Turkey"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2287-4265","authenticated-orcid":false,"given":"Arnaldo","family":"Batista","sequence":"additional","affiliation":[{"name":"NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"},{"name":"UNINOVA-CTS, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Lisbon, Portugal"}]},{"given":"Sara","family":"Russo","sequence":"additional","affiliation":[{"name":"NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"given":"Filipa","family":"Esgalhado","sequence":"additional","affiliation":[{"name":"NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"},{"name":"NMT S.A., Parque Tecnol\u00f3gico de Cantanhede, N\u00facleo 04, Lote 3, 3060-197 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8103-8574","authenticated-orcid":false,"given":"Catarina R. Palma","family":"dos Reis","sequence":"additional","affiliation":[{"name":"Maternidade Alfredo da Costa, Rua Viriato 1, 1050-170 Lisbon, Portugal"},{"name":"Faculty of Medical Sciences, Nova Medical School, NOVA University Lisbon, 1169-056 Lisbon, Portugal"}]},{"given":"F\u00e1tima","family":"Serrano","sequence":"additional","affiliation":[{"name":"Maternidade Alfredo da Costa, Rua Viriato 1, 1050-170 Lisbon, Portugal"},{"name":"Faculty of Medical Sciences, Nova Medical School, NOVA University Lisbon, 1169-056 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4270-3284","authenticated-orcid":false,"given":"Manuel","family":"Ortigueira","sequence":"additional","affiliation":[{"name":"NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"},{"name":"UNINOVA-CTS, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Lisbon, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,2,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Marque, C.K., Terrien, J., Rihana, S., and Germain, G. 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