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Publications (10 of 15) Show all publications
Yang, L., Lu, K., Forsman, M., Lindecrantz, K., Seoane, F., Ekblom, Ö. & Eklund, J. (2019). Evaluation of physiological workload assessment methods using heart rate and accelerometry for a smart wearable system. Ergonomics, 62(5), 694-705
Open this publication in new window or tab >>Evaluation of physiological workload assessment methods using heart rate and accelerometry for a smart wearable system
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2019 (English)In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, Vol. 62, no 5, p. 694-705Article in journal (Refereed) Published
Abstract [en]

Work metabolism (WM) can be accurately estimated by oxygen consumption (VO2), which is commonly assessed by heart rate (HR) in field studies. However, the VO2–HR relationship is influenced by individual capacity and activity characteristics. The purpose of this study was to evaluate three models for estimating WM compared with indirect calorimetry, during simulated work activities. The techniques were: the HR-Flex model; HR branched model, combining HR with hip-worn accelerometers (ACC); and HR + arm-leg ACC model, combining HR with wrist- and thigh-worn ACC. Twelve participants performed five simulated work activities and three submaximal tests. The HR + arm-leg ACC model had the overall best performance with limits of agreement (LoA) of −3.94 and 2.00 mL/min/kg, while the HR-Flex model had −5.01 and 5.36 mL/min/kg and the branched model, −6.71 and 1.52 mL/min/kg. In conclusion, the HR + arm-leg ACC model should, when feasible, be preferred in wearable systems for WM estimation.

Keywords
Heart rate, work metabolism, motion sensing, wearable sensors, risk assessment, estimation models
National Category
Medical Engineering
Identifiers
urn:nbn:se:kth:diva-239148 (URN)10.1080/00140139.2019.1566579 (DOI)000468779800007 ()30806164 (PubMedID)2-s2.0-85062366366 (Scopus ID)
Funder
AFA Insurance, 150039
Note

QC 20190218

Available from: 2018-11-16 Created: 2018-11-16 Last updated: 2019-10-10Bibliographically 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
Kjellmer, I., Lindecrantz, K. & Rosen, K. G. (2019). ST analysis of the fetal electrocardiogram - Comments on recent experimental data. PLoS ONE, 14(8), Article ID e0221210.
Open this publication in new window or tab >>ST analysis of the fetal electrocardiogram - Comments on recent experimental data
2019 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 14, no 8, article id e0221210Article in journal (Refereed) Published
Abstract [en]

In their paper, Andriessen at al present a validation of fetal ECG analysis and the clinical STAN device in midgestation fetal lambs exposed to 25 minutes of umbilical cord occlusion. The study presents results that contrast remarkably from previously published experimental data which raises a number of questions and comments. The most striking finding of Andriessen et al is the recording of an extremely high number of alarms from the STAN equipment during control conditions when no alarms at all are expected. These patterns have never been seen, neither in the clinical situation nor in our own fetal sheep studies. The reason for this becomes apparent when their way of recording the FECG is scrutinized. In their assessment of STAN, Andriessen at al use an assumed negative aVF lead with the assumption that it will reflect the FECG in the same way as the unipolar scalp lead used clinically. The signal used for disqualification of STAN is itself not qualified to properly represent the fetal scalp lead signal that STAN is designed for. To question a proven technology is fully accepted but those attempting would be asked to argue along fully validated data and related analysis including questioning of their own data.

Place, publisher, year, edition, pages
PUBLIC LIBRARY SCIENCE, 2019
National Category
Clinical Medicine
Identifiers
urn:nbn:se:kth:diva-261333 (URN)10.1371/journal.pone.0221210 (DOI)000485036900035 ()31437186 (PubMedID)2-s2.0-85071086976 (Scopus ID)
Note

QC 20191007

Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-10-16Bibliographically approved
Lu, K., Yang, L., Abtahi, F., Lindecrantz, K., Rödby, K. & Seoane, F. (2019). Wearable cardiorespiratory monitoring system for unobtrusive free-living energy expenditure tracking. In: IFMBE Proceedings: . Paper presented at World Congress on Medical Physics and Biomedical Engineering, WC 2018, 3 June 2018 through 8 June 2018 (pp. 433-437). Springer (1)
Open this publication in new window or tab >>Wearable cardiorespiratory monitoring system for unobtrusive free-living energy expenditure tracking
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2019 (English)In: IFMBE Proceedings, Springer, 2019, no 1, p. 433-437Conference paper, Published paper (Refereed)
Abstract [en]

In this work, we want to introduce combined heart rate and respiration monitoring for more accurate energy expenditure tracking on free-living subjects. We have developed a wearable cardiorespiratory monitoring system with unobtrusive heart rate measurement and ventilation estimation function for this purpose. The system is based on a garment with integrated textile electrodes for one-lead electrocardiogram and impedance pneumography measurements. A pilot experiment has been performed to prove the concept and to evaluate the characteristics of heart rate and ventilation estimated by our system in relation to energy expenditure. In the experiment, ventilation shows a better linearity in relation to the energy expenditure at the low intensity region than heart rate. Based on these characteristics, a model combining heart rate and ventilation for energy expenditure estimation is proposed which shows a significantly lower estimation error than the heart rate only model.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Energy expenditure, Impedance pneumography, Wearable devices, Biomedical engineering, Patient monitoring, Wearable technology, Energy expenditure estimation, Estimation function, Heart rate measurements, Respiration monitoring, Textile electrodes, Heart
National Category
Medical Engineering
Identifiers
urn:nbn:se:kth:diva-236338 (URN)10.1007/978-981-10-9035-6_80 (DOI)000450908300080 ()2-s2.0-85048260818 (Scopus ID)
Conference
World Congress on Medical Physics and Biomedical Engineering, WC 2018, 3 June 2018 through 8 June 2018
Funder
VINNOVA
Note

QC 20181109

Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2018-12-11Bibliographically approved
Lu, K., Holzmann, M., Abtahi, F., Lindecrantz, K., Lindqvist, P. G. & Nordström, L. (2018). Fetal heart rate short term variation during labor in relation to scalp blood lactate concentration. Acta Obstetricia et Gynecologica Scandinavica, 97(10), 1274-1280
Open this publication in new window or tab >>Fetal heart rate short term variation during labor in relation to scalp blood lactate concentration
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2018 (English)In: Acta Obstetricia et Gynecologica Scandinavica, ISSN 0001-6349, E-ISSN 1600-0412, Vol. 97, no 10, p. 1274-1280Article in journal (Refereed) Published
Abstract [en]

IntroductionFetal heart rate short term variation (STV) decreases with severe chronic hypoxia in the antenatal period. However, only limited research has been done on STV during labor. We have tested a novel algorithm for a valid baseline estimation and calculated STV. To explore the value of STV during labor, we compared STV with fetal scalp blood (FBS) lactate concentration, an early marker in the hypoxic process. Material and methodsSoftware was developed which estimates baseline frequency using a novel algorithm and thereby calculates STV according to Dawes and Redman in up to four 30-minute blocks prior to each FBS. Cardiotocography traces from 1070 women in labor who had had FBS performed on 2134 occasions were analyzed. ResultsIn acidemic cases (lactate >4.8mmol/L; Lactate Pro), median STV 30minutes prior to FBS was 7.10milliseconds compared with 6.09milliseconds in the preacidemic (4.2-4.8mmol/L) and 5.23milliseconds in the normal (<4.2mmol/L) groups (P<.05). There was a positive correlation between lactate and STV (rho=0.16-0.24; P<.05). Median lactate concentration in cases with STV <3.0milliseconds (n=160) was 2.3mmol/L. When 2 FBS were performed within 60minutes the change rate of lactate correlated to STV (rho=0.33; P<.001). Cases with increasing lactate concentration had a median STV of 5.29milliseconds vs 4.41milliseconds in those with decreasing lactate (P<.001). ConclusionsIn the early stages of intrapartum hypoxia, STV increases, contrary to findings regarding chronic hypoxia in the antenatal period. The increase in the adrenergic surge is a likely explanation.

Place, publisher, year, edition, pages
Wiley, 2018
Keywords
computer analysis, fetal heart rate monitoring, fetal scalp blood sampling, hypoxia, intrapartum, lactate, short-term variation
National Category
Obstetrics, Gynecology and Reproductive Medicine
Identifiers
urn:nbn:se:kth:diva-235432 (URN)10.1111/aogs.13390 (DOI)000444070900017 ()29799630 (PubMedID)2-s2.0-85052990496 (Scopus ID)
Note

QC 20180927

Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2018-10-22Bibliographically approved
Lu, K., Holzmann, M., Abtahi, F., Lindecrantz, K., Lindqvist, P. & Nordström, L. (2018). Fetal heart rate short term variation (STV) during labour in relation to early stages of hypoxia: An observational study. British Journal of Obstetrics and Gynecology, 125, 55-55
Open this publication in new window or tab >>Fetal heart rate short term variation (STV) during labour in relation to early stages of hypoxia: An observational study
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2018 (English)In: British Journal of Obstetrics and Gynecology, ISSN 1470-0328, E-ISSN 1471-0528, Vol. 125, p. 55-55Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
John Wiley & Sons, 2018
National Category
Obstetrics, Gynecology and Reproductive Medicine
Identifiers
urn:nbn:se:kth:diva-227233 (URN)000430280500136 ()
Note

QC 20180514

Available from: 2018-05-14 Created: 2018-05-14 Last updated: 2018-05-14Bibliographically approved
Gyllencreutz, E., Lu, K., Lindecrantz, K., Lindqvist, P., Nordström, L., Holzmann, M. & Abtahi, F. (2018). Validation of a computerised algorithm to quantify fetal heart rate deceleration area: An observational study. British Journal of Obstetrics and Gynecology, 125, 54-54
Open this publication in new window or tab >>Validation of a computerised algorithm to quantify fetal heart rate deceleration area: An observational study
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2018 (English)In: British Journal of Obstetrics and Gynecology, ISSN 1470-0328, E-ISSN 1471-0528, Vol. 125, p. 54-54Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
John Wiley & Sons, 2018
National Category
Medical Image Processing
Identifiers
urn:nbn:se:kth:diva-227232 (URN)000430280500135 ()
Note

QC 20180514

Available from: 2018-05-14 Created: 2018-05-14 Last updated: 2018-05-14Bibliographically approved
Gyllencreutz, E., Lu, K., Lindecrantz, K., Lindqvist, P. G., Nordström, L., Holzmann, M. & Abtahi, F. (2018). Validation of a computerized algorithm to quantify fetal heart rate deceleration area. Acta Obstetricia et Gynecologica Scandinavica, 97(9), 1137-1147
Open this publication in new window or tab >>Validation of a computerized algorithm to quantify fetal heart rate deceleration area
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2018 (English)In: Acta Obstetricia et Gynecologica Scandinavica, ISSN 0001-6349, E-ISSN 1600-0412, Vol. 97, no 9, p. 1137-1147Article in journal (Refereed) Published
Abstract [en]

IntroductionReliability in visual cardiotocography interpretation is unsatisfying, which has led to the development of computerized cardiotocography. Computerized analysis is well established for antenatal fetal surveillance but has yet not performed sufficiently during labor. We aimed to investigate the capacity of a new computerized algorithm compared with visual assessment in identifying intrapartum fetal heart rate baseline and decelerations. Material and methodsIn all, 312 intrapartum cardiotocography tracings with variable decelerations were analyzed by the computerized algorithm and visually examined by two observers, blinded to each other and the computer analysis. The width, depth and area of each deceleration was measured. Four cases (>100 variable decelerations) were subjected to in-depth detailed analysis. The outcome measures were bias in seconds (width), beats per minute (depth), and beats (area) between computer and observers using Bland-Altman analysis. Interobserver reliability was determined by calculating intraclass correlation and Spearman rank analysis. ResultsThe analysis (312 cases) showed excellent intraclass correlation (0.89-0.95) and very strong Spearman correlation (0.82-0.91). The detailed analysis of >100 decelerations in four cases revealed low bias between the computer and the two observers; width 1.4 and 1.4 seconds, depth 5.1 and 0.7 beats per minute, and area 0.1 and -1.7 beats. This was comparable to the bias between the two observers: 0.3 seconds (width), 4.4 beats per minute (depth) and 1.7 beats (area). The intraclass correlation was excellent (0.90-.98). ConclusionA novel computerized algorithm for intrapartum cardiotocography analysis is as accurate as gold standard visual assessment, with high correlation and low bias.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2018
Keywords
Cardiotocography, computer-assisted signal processing, deceleration, fetal monitoring, interobserver variation
National Category
Obstetrics, Gynecology and Reproductive Medicine
Identifiers
urn:nbn:se:kth:diva-233267 (URN)10.1111/aogs.13370 (DOI)000440679900010 ()29768660 (PubMedID)2-s2.0-85051058017 (Scopus ID)
Note

QC 20180816

Available from: 2018-08-16 Created: 2018-08-16 Last updated: 2018-08-16Bibliographically 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
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4853-7731

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