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Publications (10 of 18) Show all publications
Ekblom, M., Bojsen-Möller, E., Tarassova, O. & Ekblom, Ö. (2019). Day-to day variations in physical activity patterns affect corticospinal excitability on the following day. In: Brain Stimulation March-April 2019, vol 12, issue 2: . Paper presented at 3rd International Brain Stimulation Conference, Feb 24-27 2019, Vancouver (pp. 468). Elsevier, 12(2), Article ID 437.
Open this publication in new window or tab >>Day-to day variations in physical activity patterns affect corticospinal excitability on the following day
2019 (English)In: Brain Stimulation March-April 2019, vol 12, issue 2, Elsevier, 2019, Vol. 12, no 2, p. 468-, article id 437Conference paper, Oral presentation with published abstract (Other academic)
Place, publisher, year, edition, pages
Elsevier, 2019
National Category
Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5738 (URN)10.1016/j.brs.2018.12.523 (DOI)
Conference
3rd International Brain Stimulation Conference, Feb 24-27 2019, Vancouver
Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-05-20Bibliographically approved
Peter, A., Arndt, A., Andersson, E., Finni, T., Hegyi, A., Tarassova, O. & Cronin, N. (2019). Effect of footwear on plantar flexor fine-wire electromyography activity in walking.. In: Footwear Science. 2019 Supplement, Vol. 11, p S120-S121: Proceedings of the Fourteenth Footwear Biomechanics Symposium (Kananaskis, Canada, 2019). Paper presented at Fourteenth Footwear Biomechanics Symposium, Kananaskis, Canada, July 28-30 2019 (pp. S120-S121). Taylor & Francis, 11
Open this publication in new window or tab >>Effect of footwear on plantar flexor fine-wire electromyography activity in walking.
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2019 (English)In: Footwear Science. 2019 Supplement, Vol. 11, p S120-S121: Proceedings of the Fourteenth Footwear Biomechanics Symposium (Kananaskis, Canada, 2019), Taylor & Francis, 2019, Vol. 11, p. S120-S121Conference paper, Oral presentation with published abstract (Other academic)
Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
barefoot, electromyography, gait analysis, lower limb, shoe
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5822 (URN)
Conference
Fourteenth Footwear Biomechanics Symposium, Kananaskis, Canada, July 28-30 2019
Available from: 2019-08-27 Created: 2019-08-27 Last updated: 2019-08-30Bibliographically approved
Körting, C., Schlippe, M., Petersson, S., Pennati, G. V., Tarassova, O., Arndt, A., . . . Wang, R. (2019). In vivo muscle morphology comparison in post-stroke survivors using ultrasonography and diffusion tensor imaging.. Scientific Reports, 9(1), Article ID 11836.
Open this publication in new window or tab >>In vivo muscle morphology comparison in post-stroke survivors using ultrasonography and diffusion tensor imaging.
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, no 1, article id 11836Article in journal (Refereed) Published
Abstract [en]

Skeletal muscle architecture significantly influences the performance capacity of a muscle. A DTI-based method has been recently considered as a new reference standard to validate measurement of muscle structure in vivo. This study sought to quantify muscle architecture parameters such as fascicle length (FL), pennation angle (PA) and muscle thickness (tm) in post-stroke patients using diffusion tensor imaging (DTI) and to quantitatively compare the differences with 2D ultrasonography (US) and DTI. Muscle fascicles were reconstructed to examine the anatomy of the medial gastrocnemius, posterior soleus and tibialis anterior in seven stroke survivors using US- and DTI-based techniques, respectively. By aligning the US and DTI coordinate system, DTI reconstructed muscle fascicles at the same scanning plane of the US data can be identified. The architecture parameters estimated based on two imaging modalities were further compared. Significant differences were observed for PA and tm between two methods. Although mean FL was not significantly different, there were considerable intra-individual differences in FL and PA. On the individual level, parameters measured by US agreed poorly with those from DTI in both deep and superficial muscles. The significant differences in muscle parameters we observed suggested that the DTI-based method seems to be a better method to quantify muscle architecture parameters which can provide important information for treatment planning and to personalize a computational muscle model.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
National Category
Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5819 (URN)10.1038/s41598-019-47968-x (DOI)000480678100035 ()31413264 (PubMedID)
Available from: 2019-08-27 Created: 2019-08-27 Last updated: 2019-09-17
Edwards, J., Bjerkefors, A., Rosén, J. S. & Tarassova, O. (2019). Paracanoe. In: Don McKenzie, Bo Berglund (Ed.), Canoeing: (pp. 106-115). Hoboken, NJ: Wiley-Blackwell
Open this publication in new window or tab >>Paracanoe
2019 (English)In: Canoeing / [ed] Don McKenzie, Bo Berglund, Hoboken, NJ: Wiley-Blackwell, 2019, p. 106-115Chapter in book (Other academic)
Place, publisher, year, edition, pages
Hoboken, NJ: Wiley-Blackwell, 2019
Series
Handbook of sports medicine and science
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5642 (URN)9781119097204 (ISBN)
Available from: 2019-03-18 Created: 2019-03-18 Last updated: 2019-09-25Bibliographically approved
Spiegl, O., Tarassova, O. & Arndt, A. (2019). The effects of new Edea and Graf figure skating boots and used Graf boots on the kinetics and kinematics of landing after simulated on-ice jumps. Footwear Science, 11(2), 121-129
Open this publication in new window or tab >>The effects of new Edea and Graf figure skating boots and used Graf boots on the kinetics and kinematics of landing after simulated on-ice jumps
2019 (English)In: Footwear Science, ISSN 1942-4280, E-ISSN 1942-4299, Vol. 11, no 2, p. 121-129Article in journal (Refereed) Published
Abstract [en]

An increase in training intensity and the number of active participants and competitors in figure skating has been accompanied by an increasing frequency of injuries. The aim of this study was to investigate whether different brands of skates as well as the usage of the skates modify the kinetics and kinematics of the landing impact from a jump. New Graf Edmonton (NG), old used Graf Edmonton (OG) and new Edea Concerto (NE) skates were compared. Twelve participants completed six jump trials from 30 cm and 50 cm high boxes, respectively in all three skates and landed on a section of artificial ice placed on a laboratory floor. Landing kinematics (Oqus4 system, Qualisys, Sweden) and kinetics (force plate: Kistler, Switzerland; insoles: Pedar, Novel, Germany) were examined. Each participant acted as their own control for statistical comparison between the skates. The results confirmed that the kinetics and kinematics of the landing are affected by wearing different skates. During landing impacts in NG, participants had significantly greater dorsiflexion at initial contact (IC) and peak dorsiflexion of the ankle, peak flexion of the knee and also greater in-skate plantar forces (PF) than in NE, which may increase the risk of injury. In OG, participants had significantly greater peak flexion of knee and longer time from IC to first peak dorsiflexion (TP) of the ankle than in NG. The differences observed may be due to the different construction designs, such as height of the heel, used materials, and stiffness of the skates, which may affect injury occurrence.

Place, publisher, year, edition, pages
Routledge, 2019
Keywords
Figure skating boots, jump landing, landing impact, kinetics, kinematics
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5801 (URN)10.1080/19424280.2018.1539126 (DOI)000470064200006 ()
Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-13
Rosén, J. S., Arndt, A., Goosey-Tolfrey, V. L., Mason, B. S., Hutchinson, M. J., Tarassova, O. & Bjerkefors, A. (2019). The impact of impairment on kinematic and kinetic variables in Va'a paddling: Towards a sport-specific evidence-based classification system for Para Va'a.. Journal of Sports Sciences, 37(17), 1942-1950
Open this publication in new window or tab >>The impact of impairment on kinematic and kinetic variables in Va'a paddling: Towards a sport-specific evidence-based classification system for Para Va'a.
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2019 (English)In: Journal of Sports Sciences, ISSN 0264-0414, E-ISSN 1466-447X, Vol. 37, no 17, p. 1942-1950Article in journal (Refereed) Published
Abstract [en]

Para Va'a is a new Paralympic sport in which athletes with trunk and/or leg impairment compete over 200 m. The purpose of this study was to examine the impact of impairment on kinematic and kinetic variables during Va'a ergometer paddling. Ten able-bodied and 44 Para Va'a athletes with impairments affecting: trunk and legs (TL), legs bilaterally (BL) or leg unilaterally (UL) participated. Differences in stroke frequency, mean paddling force, and joint angles and correlation of the joint angles with paddling force were examined. Able-bodied demonstrated significantly greater paddling force as well as knee and ankle flexion ranges of movement (ROM) on the top hand paddling side compared to TL, BL and UL. Able-bodied, BL and UL demonstrated greater paddling force and trunk flexion compared to TL, and UL demonstrated larger bottom hand paddling side knee and ankle flexion ROM compared to BL. Significant positive correlations were observed for both male and female athletes between paddling force and all trunk flexion angles and ROM in the trunk and pelvis rotation and bottom hand paddling side hip, knee and ankle flexion. The results of this study are important for creating an evidence-based classification system for Para Va'a.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Outrigger, disability, paddling force, paralympics
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5717 (URN)10.1080/02640414.2019.1606763 (DOI)000470359400001 ()31006343 (PubMedID)
Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-08-13
Bjerkefors, A., Rosén, J. S., Tarassova, O. & Arndt, A. (2019). Three-Dimensional Kinematics and Power Output in Elite Para-Kayakers and Elite Able-Bodied Flat-Water Kayakers.. Journal of Applied Biomechanics, 93-100
Open this publication in new window or tab >>Three-Dimensional Kinematics and Power Output in Elite Para-Kayakers and Elite Able-Bodied Flat-Water Kayakers.
2019 (English)In: Journal of Applied Biomechanics, ISSN 1065-8483, E-ISSN 1543-2688, p. 93-100Article in journal (Refereed) Published
Abstract [en]

Trunk, pelvis and leg movement are important for performance in sprint kayaking. Para-kayaking is a new Paralympic sport in which athletes with trunk and/or leg impairment compete in three classification groups. The purpose of this study was to identify how physical impairments impact on performance by examining: differences in three-dimensional joint range of motion (RoM) between 10 (4 females, 6 males) elite able-bodied kayakers and 41 (13 females, 28 males) elite para-kayakersfrom the three classification groups, and which joint angles were correlated with power output during high intensity kayak ergometer paddling. There were significant differences in RoM between the able-bodied kayakers and the three para-kayak groups for the shoulders (flexion, rotation: able-bodied kayakers<para-kayakers), trunk and pelvis (rotation: able-bodied kayakers>para-kayakers) and legs (hip, knee, ankle flexion: able-bodied kayakers>para-kayakers) during paddling. Furthermore, athletes with greater impairment exhibited lower trunk and leg RoM compared to those with less impairment. Significant positive correlations were observed for both males and females between power output and peak shoulder and trunk flexion, trunk and pelvis rotation RoM and hip, knee and ankle flexion RoM. This information is important for understanding how key kinematic and kinetic variables for para-kayaking performance vary between athletes from different classification groups.

Place, publisher, year, edition, pages
Human Kinetics, 2019
Keywords
3D analysis, Paralympics, canoe, disability, ergometer, kinetics
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5432 (URN)10.1123/jab.2017-0102 (DOI)000461017800001 ()30300050 (PubMedID)
Available from: 2018-10-16 Created: 2018-10-16 Last updated: 2019-03-29Bibliographically approved
Zhou, G.-Q., Zhang, Y., Wang, R.-L., Zhou, P., Zheng, Y.-P., Tarassova, O., . . . Chen, Q. (2018). Automatic Myotendinous Junction Tracking in Ultrasound Images with Phase-Based Segmentation.. BioMed Research International, Article ID 3697835.
Open this publication in new window or tab >>Automatic Myotendinous Junction Tracking in Ultrasound Images with Phase-Based Segmentation.
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2018 (English)In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141, article id 3697835Article in journal (Refereed) Published
Abstract [en]

Displacement of the myotendinous junction (MTJ) obtained by ultrasound imaging is crucial to quantify the interactive length changes of muscles and tendons for understanding the mechanics and pathological conditions of the muscle-tendon unit during motion. However, the lack of a reliable automatic measurement method restricts its application in human motion analysis. This paper presents an automated measurement of MTJ displacement using prior knowledge on tendinous tissues and MTJ, precluding the influence of nontendinous components on the estimation of MTJ displacement. It is based on the perception of tendinous features from musculoskeletal ultrasound images using Radon transform and thresholding methods, with information about the symmetric measures obtained from phase congruency. The displacement of MTJ is achieved by tracking manually marked points on tendinous tissues with the Lucas-Kanade optical flow algorithm applied over the segmented MTJ region. The performance of this method was evaluated on ultrasound images of the gastrocnemius obtained from 10 healthy subjects (26.0±2.9 years of age). Waveform similarity between the manual and automatic measurements was assessed by calculating the overall similarity with the coefficient of multiple correlation (CMC).<italic> In vivo</italic> experiments demonstrated that MTJ tracking with the proposed method (CMC = 0.97±0.02) was more consistent with the manual measurements than existing optical flow tracking methods (CMC = 0.79±0.11). This study demonstrated that the proposed method was robust to the interference of nontendinous components, resulting in a more reliable measurement of MTJ displacement, which may facilitate further research and applications related to the architectural change of muscles and tendons. [ABSTRACT FROM AUTHOR]

Place, publisher, year, edition, pages
Hindawi Limited, 2018
Keywords
Surgetendon Ry, Calf Muscles, Surgery, Algorithms, Automation, Correlation (Statistics), Dislocations (Anatomy), Tendons, Ultrasonic Imaging, Wave Analysis, Computer-Assisted Surgery, In Vivo Studies
National Category
Medical Laboratory and Measurements Technologies
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5234 (URN)10.1155/2018/3697835 (DOI)000427851400001 ()29750152 (PubMedID)
Available from: 2018-03-28 Created: 2018-03-28 Last updated: 2018-10-15
da Silva, J. C., Ekblom, M., Tarassova, O., Andersson, E., Rönquist, G., Grundström, H. & Arndt, A. (2018). Effect of increasing workload on knee extensor and flexor muscular activity during cycling as measured with intramuscular electromyography.. PLoS ONE, 13(8), Article ID e0201014.
Open this publication in new window or tab >>Effect of increasing workload on knee extensor and flexor muscular activity during cycling as measured with intramuscular electromyography.
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2018 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 8, article id e0201014Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was to describe the effect of increasing workload on individual thigh muscle activation during a 20 minute incremental cycling test. Intramuscular electromyographic signals were recorded from the knee extensors rectus femoris, vastus lateralis, vastus medialis and vastus intermedius and the knee flexors semimembranosus, semitendinosus, and the short and long heads of the biceps femoris during increasing workloads. Mean activation levels were compared over the whole pedaling cycle and the crank angles at which onset and offset of activation and peak activity occurred were identified for each muscle. These data were compared between three workloads. EMG activation level significantly increased (p<0.05) with increasing workload in the rectus femoris, vastus medialis, vastus lateralis, vastus intermedius, biceps femoris long head, semitendinosus and semimembranosus but not in the biceps femoris short head. A significant change in activation timing was found for the rectus femoris, vastus lateralis, vastus medialis and semitendinosus. Of the knee flexors only the short head of the biceps femoris had its peak activity during the upstroke phase at the two highest workloads indicating a unique contribution to knee flexion.

National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5379 (URN)10.1371/journal.pone.0201014 (DOI)000440778600023 ()30071032 (PubMedID)
Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2018-09-04
Yan, S., Schlippe, M., Tarassova, O., Pennati, G. V., Arndt, A., Yang, L., . . . Wang, R. (2018). P 158 - A method to estimate passive mechanical properties of the soleus and gastrocnemius aspects of Achilles tendon.. In: ESMAC 2018 abstracts: special issue of Gait & Posture. Paper presented at 27th Annual Meeting of the European Society for Movement Analysis in Adults and Children (ESMAC 2018). 24-29.9 2018 Prague (pp. 501-502). , 65 Suppl 1, Article ID S0966-6362(18)31146-9.
Open this publication in new window or tab >>P 158 - A method to estimate passive mechanical properties of the soleus and gastrocnemius aspects of Achilles tendon.
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2018 (English)In: ESMAC 2018 abstracts: special issue of Gait & Posture, 2018, Vol. 65 Suppl 1, p. 501-502, article id S0966-6362(18)31146-9Conference paper, Oral presentation with published abstract (Refereed)
National Category
Orthopaedics
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5427 (URN)10.1016/j.gaitpost.2018.07.079 (DOI)30224124 (PubMedID)
Conference
27th Annual Meeting of the European Society for Movement Analysis in Adults and Children (ESMAC 2018). 24-29.9 2018 Prague
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-10-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7456-8606

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