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Publications (10 of 32) Show all publications
Vega-Barbas, M., Diaz-Olivares, J. A., Lu, K., Forsman, M., Seoane, F. & Abtahi, F. (2019). P-Ergonomics Platform: Toward Precise, Pervasive, and Personalized Ergonomics using Wearable Sensors and Edge Computing. Sensors, 19(5), Article ID 1225.
Open this publication in new window or tab >>P-Ergonomics Platform: Toward Precise, Pervasive, and Personalized Ergonomics using Wearable Sensors and Edge Computing
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2019 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, no 5, article id 1225Article in journal (Refereed) Published
Abstract [en]

Preventive healthcare has attracted much attention recently. Improving people's lifestyles and promoting a healthy diet and wellbeing are important, but the importance of work-related diseases should not be undermined. Musculoskeletal disorders (MSDs) are among the most common work-related health problems. Ergonomists already assess MSD risk factors and suggest changes in workplaces. However, existing methods are mainly based on visual observations, which have a relatively low reliability and cover only part of the workday. These suggestions concern the overall workplace and the organization of work, but rarely includes individuals' work techniques. In this work, we propose a precise and pervasive ergonomic platform for continuous risk assessment. The system collects data from wearable sensors, which are synchronized and processed by a mobile computing layer, from which exposure statistics and risk assessments may be drawn, and finally, are stored at the server layer for further analyses at both individual and group levels. The platform also enables continuous feedback to the worker to support behavioral changes. The deployed cloud platform in Amazon Web Services instances showed sufficient system flexibility to affordably fulfill requirements of small to medium enterprises, while it is expandable for larger corporations. The system usability scale of 76.6 indicates an acceptable grade of usability.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
disease prevention, occupational healthcare, P-Ergonomics, precision ergonomics, musculoskeletal disorders, smart textiles, wearable sensors, wellbeing at work
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:kth:diva-249891 (URN)10.3390/s19051225 (DOI)000462540400244 ()30862019 (PubMedID)2-s2.0-85062856566 (Scopus ID)
Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-04-26Bibliographically approved
Yang, L., Abtahi, F., Eklund, J., Hanson, L., Lindecrantz, K., Forsman, M. & Carl, L. (2019). Smart workwear system with real-time vibrotactile feedback for improving postural behaviour in industry. In: From research to evidence based sustainable interventions and practices: Book of Abstracts: . Paper presented at the 10th International Scientific Conference on the Prevention of Work-Related Musculoskeletal Disorders (PREMUS) (pp. 160). Bologna, Italy
Open this publication in new window or tab >>Smart workwear system with real-time vibrotactile feedback for improving postural behaviour in industry
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2019 (English)In: From research to evidence based sustainable interventions and practices: Book of Abstracts, Bologna, Italy, 2019, p. 160-Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Bologna, Italy: , 2019
National Category
Occupational Health and Environmental Health Medical Ergonomics
Research subject
Technology and Health
Identifiers
urn:nbn:se:kth:diva-262052 (URN)
Conference
the 10th International Scientific Conference on the Prevention of Work-Related Musculoskeletal Disorders (PREMUS)
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-14
Hilderman, M., Qureshi, A. R., Abtahi, F., Witt, N., Jägren, C., Olbers, J., . . . Bruchfeld, A. (2019). The cholinergic anti-inflammatory pathway in resistant hypertension treated with renal denervation. Molecular medicine (Cambridge, Mass. Print), 25(1)
Open this publication in new window or tab >>The cholinergic anti-inflammatory pathway in resistant hypertension treated with renal denervation
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2019 (English)In: Molecular medicine (Cambridge, Mass. Print), ISSN 1076-1551, E-ISSN 1528-3658, Vol. 25, no 1Article in journal (Refereed) Published
Abstract [en]

Renal denervation (RDN) reduces sympathetic tone and may alter the sympathetic-parasympathetic balance. The autonomic nervous system is partly a regulator of innate immunity via the cholinergic anti-inflammatory pathway (CAP) which inhibits inflammation via the vagus nerve. Placental Growth Factor (PlGF) influences a neuro-immunological pathway in the spleen which may contribute to hypertension. The aim of this study was to investigate if modulation of renal sympathetic nerve activity affects CAP in terms of cytokine release as well as levels of PlGF.

National Category
Immunology in the medical area Other Medical Engineering
Identifiers
urn:nbn:se:kth:diva-258438 (URN)10.1186/s10020-019-0097-y (DOI)000481838100001 ()2-s2.0-85070996404 (Scopus ID)
Note

QC 20190913

Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-09-13Bibliographically approved
Hafid, A., Benouar, S., Kedir-talha, M., Abtahi, F., Attari, M. & Seoane, F. (2018). Full Impedance Cardiography Measurement Device Using Raspberry PI3 and System-on-Chip Biomedical Instrumentation Solutions. IEEE journal of biomedical and health informatics, 22(6), 1883-1894
Open this publication in new window or tab >>Full Impedance Cardiography Measurement Device Using Raspberry PI3 and System-on-Chip Biomedical Instrumentation Solutions
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2018 (English)In: IEEE journal of biomedical and health informatics, ISSN 2168-2194, E-ISSN 2168-2208, Vol. 22, no 6, p. 1883-1894Article in journal (Refereed) Published
Abstract [en]

Impedance cardiography (ICG) is a noninvasive method for monitoring cardiac dynamics using electrical bioimpedance (EBI) measurements. Since its appearance more than 40 years ago, ICG has been used for assessing hemodynamic parameters. This paper presents a measurement system based on two System on Chip (SoC) solutions and Raspberry PI, implementing both a full three-lead ECG recorder and an impedance cardiographer, for educational and research development purposes. Raspberry PI is a platform supporting Do-I t-Yourself project and education applications across the world. The development is part of Biosignal PI, an open hardware platform focusing in quick prototyping of physiological measurement instrumentation. The SoC used for sensing cardiac biopotential is the ADAS1000, and for the EBI measurement is the AD5933. The recordings were wirelessly transmitted through Bluetooth to a PC, where the waveforms were displayed, and hemodynamic parameters such as heart rate, stroke volume, ejection time and cardiac output were extracted from the ICG and ECG recordings. These results show how Raspberry PI can be used for quick prototyping using relatively widely available and affordable components, for supporting developers in research and engineering education. The design and development documents will be available on www.BiosignalPl.com, for open access under a Non Commercial-Share A like 4.0 International License.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2018
Keywords
AD5933, ADAS1000, bioimpedance, biosignal PI, biomedical instrumentation, cardiac monitoring, personalized healthcare, portable ECG, ICG, Raspberry PI3
National Category
Medical Biotechnology
Identifiers
urn:nbn:se:kth:diva-238525 (URN)10.1109/JBHI.2017.2783949 (DOI)000447833100019 ()29990025 (PubMedID)
Note

QC 20181106

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-06Bibliographically approved
Karbalaie, A., Etehadtavakol, M., Abtahi, F., Fatemi, A., Emrani, Z. & Erlandsson, B.-E. (2018). Image Enhancement Effect on Inter and Intra-observer Reliability of Nailfold Capillary Assessment. Microvascular Research
Open this publication in new window or tab >>Image Enhancement Effect on Inter and Intra-observer Reliability of Nailfold Capillary Assessment
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2018 (English)In: Microvascular Research, ISSN 0026-2862, E-ISSN 1095-9319Article in journal (Refereed) Published
Abstract [en]

Background: Nailfold capillaroscopy (NC) is a diagnostic imaging technique that is used to assess the blood capillary network in the nailfold area. NC is routinely used for patients with microcirculation problems, such as systemic sclerosis and other connective tissue diseases.  Experts commonly use subjective evaluation as a reference point in images of nailfold video capillaroscopy, so it is important to reduce the inherent ambiguities in human judgment and diagnosis. Image quality is an important factor that affects measurement error and assessment time of NC images.

Objective: In this study, a new image enhancement technique was introduced and evaluated subjectively.

Methods: In total, 475 nailfold video capillaroscopy images from 18 healthy subjects and 41 systemic lupus erythematosus patients were used. The images were randomly divided into two sets, one each with 275 and 200. Eight independent observers who were familiar with the capillaroscopy technique participated in this study. The set of 275 images was evaluated by three observers with the forced–choice pairwise comparison method. Elliptic broken line (EBL) was used to count the number of capillaries. The intra- and inter-observer reliability of the original and enhanced images was evaluated on 200 images by five observers.

Result: Except for eight images, all observers preferred the enhanced images in the visual quality comparison method. The intra-class correlation coefficient (ICC) of intra- and inter-observer reliability increased from 0.76-0.84 to 0.82-0.89, respectively, when using the enhancement method.

Conclusion: By improving the image quality, more capillary details will be visible, and an observer can document more details that may not be visible in the original image and can do so more efficiently.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Nailfold capillaroscopy; Image enhancement; Inter and intra-observer reliability; Capillary density; Systemic lupus erythematosus
National Category
Medical and Health Sciences
Research subject
Medical Technology
Identifiers
urn:nbn:se:kth:diva-231959 (URN)10.1016/j.mvr.2018.06.005 (DOI)000449037600016 ()2-s2.0-85051111896 (Scopus ID)
Note

QC 20180821

Available from: 2018-07-05 Created: 2018-07-05 Last updated: 2018-11-20Bibliographically approved
Abtahi, F., Lu, K., Diaz-Olivares, J. A., Forsman, M., Seoane, F. & Lindecrantz, K. (2018). Wearable Sensors Enabling Personalized Occupational Healthcare. In: Chatzigiannakis, I Tobe, Y Novais, P Amft, O (Ed.), INTELLIGENT ENVIRONMENTS 2018: . Paper presented at 14th International Conference on Intelligent Environments (IE), JUN 25-28, 2018, Sapienza Univ Roma, Dipartimento Ingn Informatica, Automatica & Gestionale, Roma, ITALY (pp. 371-376). IOS PRESS
Open this publication in new window or tab >>Wearable Sensors Enabling Personalized Occupational Healthcare
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2018 (English)In: INTELLIGENT ENVIRONMENTS 2018 / [ed] Chatzigiannakis, I Tobe, Y Novais, P Amft, O, IOS PRESS , 2018, p. 371-376Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents needs and potentials for wearable sensors in occupational healthcare. In addition, it presents ongoing European and Swedish projects for developing personalized, and pervasive wearable systems for assessing risks of developing musculoskeletal disorders and cardiovascular diseases at work. Occupational healthcare should benefit in preventing diseases and disorders by providing the right feedback at the right time to the right person. Collected data from workers can provide evidence supporting the ergonomic and industrial tasks of redesigning the working environment to reduce the risks.

Place, publisher, year, edition, pages
IOS PRESS, 2018
Series
Ambient Intelligence and Smart Environments, ISSN 1875-4163 ; 23
Keywords
P-Health, Ergonomic, Wearable Technologies
National Category
Medical Ergonomics
Identifiers
urn:nbn:se:kth:diva-259484 (URN)10.3233/978-1-61499-874-7-371 (DOI)000482617600045 ()978-1-61499-874-7 (ISBN)978-1-61499-873-0 (ISBN)
Conference
14th International Conference on Intelligent Environments (IE), JUN 25-28, 2018, Sapienza Univ Roma, Dipartimento Ingn Informatica, Automatica & Gestionale, Roma, ITALY
Note

QC 20190916

Available from: 2019-09-16 Created: 2019-09-16 Last updated: 2019-09-16Bibliographically approved
Yang, L., Lu, K., Abtahi, F., Lindecrantz, K., Seoane, F., Forsman, M. & Eklund, J. (2017). A pilot study of using smart clothes for physicalworkload assessment. In: JOY AT WORK: . Paper presented at Conference Proceedings of Nordic Ergonomics Society 49th Annual Conference (pp. 169-170). Lund, Sweden
Open this publication in new window or tab >>A pilot study of using smart clothes for physicalworkload assessment
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2017 (English)In: JOY AT WORK, Lund, Sweden, 2017, p. 169-170Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Lund, Sweden: , 2017
Keywords
Energy expenditure estimation, pulmonary ventilation, heart rate.
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-227864 (URN)978-91-7753-152-4 (ISBN)
Conference
Conference Proceedings of Nordic Ergonomics Society 49th Annual Conference
Note

QC 20180614

Available from: 2018-05-14 Created: 2018-05-14 Last updated: 2018-06-14Bibliographically approved
Gyllencreutz, E., Lu, K., Abtahi, F., Lindecrantz, K., Nordström, L., Lindqvist, P. & Holzmann, M. (2017). Characteristics of variable decelerations and prediction of fetal acidemia. Paper presented at 37th Annual Pregnancy Meeting of the Society-for-Maternal-Fetal-Medicine (SMFM), JAN 23-28, 2017, Las Vegas, NV. American Journal of Obstetrics and Gynecology, 216(1), S507-S507
Open this publication in new window or tab >>Characteristics of variable decelerations and prediction of fetal acidemia
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2017 (English)In: American Journal of Obstetrics and Gynecology, ISSN 0002-9378, E-ISSN 1097-6868, Vol. 216, no 1, p. S507-S507Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Obstetrics, Gynecology and Reproductive Medicine
Identifiers
urn:nbn:se:kth:diva-219522 (URN)000414256403203 ()
Conference
37th Annual Pregnancy Meeting of the Society-for-Maternal-Fetal-Medicine (SMFM), JAN 23-28, 2017, Las Vegas, NV
Note

QC 20171208

Available from: 2017-12-08 Created: 2017-12-08 Last updated: 2017-12-08Bibliographically approved
Karbalaie, A., Abtahi, F., Fatemi, A., Etehadtavakol, M., Emrani, Z. & Erlandsson, B.-E. (2017). Elliptical broken line method for calculating capillary density in nailfold capillaroscopy: Proposal and evaluation. Microvascular Research, 113, 1-8
Open this publication in new window or tab >>Elliptical broken line method for calculating capillary density in nailfold capillaroscopy: Proposal and evaluation
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2017 (English)In: Microvascular Research, ISSN 0026-2862, E-ISSN 1095-9319, Vol. 113, p. 1-8Article in journal (Refereed) Published
Abstract [en]

Nailfold capillaroscopy is a practical method for identifying and obtaining morphological changes in capillaries which might reveal relevant information about diseases and health. Capillaroscopy is harmless, and seems simple and repeatable. However, there is lack of established guidelines and instructions for acquisition as well as the interpretation of the obtained images; which might lead to various ambiguities. In addition, assessment and interpretation of the acquired images are very subjective. In an attempt to overcome some of these problems, in this study a new modified technique for assessment of nailfold capillary density is introduced. The new method is named elliptic broken line (EBL) which is an extension of the two previously known methods by defining clear criteria for finding the apex of capillaries in different scenarios by using a fitted elliptic. A graphical user interface (GUI) is developed for pre-processing, manual assessment of capillary apexes and automatic correction of selected apexes based on 90° rule. Intra- and inter-observer reliability of EBL and corrected EBL is evaluated in this study. Four independent observers familiar with capillaroscopy performed the assessment for 200 nailfold videocapillaroscopy images, form healthy subject and systemic lupus erythematosus patients, in two different sessions. The results show elevation from moderate (ICC = 0.691) and good (ICC = 0.753) agreements to good (ICC = 0.750) and good (ICC = 0.801) for intra- and inter-observer reliability after automatic correction of EBL. This clearly shows the potential of this method to improve the reliability and repeatability of assessment which motivates us for further development of automatic tool for EBL method.

Place, publisher, year, edition, pages
Academic Press, 2017
Keywords
Capillary density, Nailfold capillaroscopy, Number of papillae, Reliability, Repeatability
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:kth:diva-207279 (URN)10.1016/j.mvr.2017.04.002 (DOI)000404692200001 ()28414021 (PubMedID)2-s2.0-85017510457 (Scopus ID)
Note

QC 20170619

Available from: 2017-06-19 Created: 2017-06-19 Last updated: 2018-11-20Bibliographically approved
Karbalaie, A., Fatemi, A., Etehadtavakol, M., Abtahi, F., Emrani, Z. & Erlandsson, B.-E. (2016). Counting Capillaries in Nailfold Capillaroscopy:State of the Art and a Proposed Method. In: 2016 IEEE EMBS CONFERENCE ON BIOMEDICAL ENGINEERING AND SCIENCES (IECBES): . Paper presented at Conference on Biomedical Engineering and Sciences (IECBES) (pp. 170-174). IEEE
Open this publication in new window or tab >>Counting Capillaries in Nailfold Capillaroscopy:State of the Art and a Proposed Method
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2016 (English)In: 2016 IEEE EMBS CONFERENCE ON BIOMEDICAL ENGINEERING AND SCIENCES (IECBES), IEEE, 2016, , p. 5p. 170-174Conference paper, Published paper (Refereed)
Abstract [en]

Capillaries play a crucial role in the microcirculatory system by exchanging metabolic substrates and waste products between blood and various tissues. The behavior of capillaries is affiliated with the number of capillaries per unit volume of tissue. Among the various noninvasive techniques available for analyzing skin microcirculation, nailfold capillaroscopyis considered to be a simple and easy-to-perform technique that allows a direct in-vivo visualization of the capillary network.Capillary density is one of the most important parameters in the studies involving capillaroscopy images. Capillary density in most of studies is defined as the number of capillaries in a one-millimeter span of the distal row in each finger or toe. This definition is silent about counting or excluding the number of the capillary with different shapes. However, there is no single standard for counting the number of capillaries in a span of one millimeter. In this paper, a novel method is proposed for determining the nailfold capillary density. This method is a modified combination of two existing techniques: the direct observation and the 90◦ method.Compared to the two existing approaches, the proposed method is more straightforward and easy to use for cases in which the capillaries have different shapes and sizes. Through different examples, we have shown how this method can be used to select the apex point of the capillary and subsequently count the number of capillaries with several papillae.

Place, publisher, year, edition, pages
IEEE, 2016. p. 5
National Category
Medical and Health Sciences
Research subject
Medical Technology
Identifiers
urn:nbn:se:kth:diva-224836 (URN)10.1109/IECBES.2016.7843437 (DOI)000400605700035 ()2-s2.0-85015704316 (Scopus ID)
Conference
Conference on Biomedical Engineering and Sciences (IECBES)
Note

QC 20180327

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-11-20Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7807-8682

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