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Publications (10 of 21) Show all publications
Hegyi, A., Peter, A., Andersson, E., Arndt, A., Finni, T., Tarassova, O. & Cronin, N. J. (2019). Ankle joint angle influences hamstring fine-wire and high-density electromyography activity in ramp isometric knee flexions. In: : . Paper presented at International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019.
Open this publication in new window or tab >>Ankle joint angle influences hamstring fine-wire and high-density electromyography activity in ramp isometric knee flexions
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2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Biophysics
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5919 (URN)
Conference
International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019
Available from: 2019-11-22 Created: 2019-11-22 Last updated: 2019-11-28Bibliographically approved
Péter, A., Andersson, E., Hegyi, A., Finni, T., Tarassova, O., Cronin, N., . . . Arndt, A. (2019). Comparing Surface and Fine-Wire Electromyography Activity of Lower Leg Muscles at Different Walking Speeds.. Frontiers in Physiology, 10, Article ID 1283.
Open this publication in new window or tab >>Comparing Surface and Fine-Wire Electromyography Activity of Lower Leg Muscles at Different Walking Speeds.
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2019 (English)In: Frontiers in Physiology, ISSN 1664-042X, E-ISSN 1664-042X, Vol. 10, article id 1283Article in journal (Refereed) Published
Abstract [en]

Ankle plantar flexor muscles are active in the stance phase of walking to propel the body forward. Increasing walking speed requires increased plantar flexor excitation, frequently assessed using surface electromyography (EMG). Despite its popularity, validity of surface EMG applied on shank muscles is mostly unclear. Thus, we examined the agreement between surface and intramuscular EMG at a range of walking speeds. Ten participants walked overground at slow, preferred, fast, and maximum walking speeds (1.01 ± 0.13, 1.43 ± 0.19, 1.84 ± 0.23, and 2.20 ± 0.38 m s-1, respectively) while surface and fine-wire EMG activities of flexor hallucis longus (FHL), soleus (SOL), medial gastrocnemius (MG) and lateral gastrocnemius (LG), and tibialis anterior (TA) muscles were recorded. Surface and intramuscular peak-normalised EMG amplitudes were compared for each muscle and speed across the stance phase using Statistical Parametric Mapping. In FHL, we found differences around peak activity at all speeds except fast. There was no difference in MG at any speed or in LG at slow and preferred speeds. For SOL and LG, differences were seen in the push-off phase at fast and maximum walking speeds. In SOL and TA, surface EMG registered activity during phases in which intramuscular EMG indicated inactivity. Our results suggest that surface EMG is generally a suitable method to measure MG and LG EMG activity across several walking speeds. Minimising cross-talk in FHL remains challenging. Furthermore, SOL and TA muscle onset/offset defined by surface EMG should be interpreted cautiously. These findings should be considered when recording and interpreting surface EMG of shank muscles in walking.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2019
Keywords
EMG, ankle plantar flexor muscles, bipedal locomotion, intramuscular electromyography, surface electromyography
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5900 (URN)10.3389/fphys.2019.01283 (DOI)000497364700001 ()31649557 (PubMedID)
Available from: 2019-10-29 Created: 2019-10-29 Last updated: 2019-12-05
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: 2019-12-02Bibliographically 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
Peter, A., Andersson, E., Tarassova, O., Finni, T., Hegyi, A., Cronin, N. & Arndt, A. (2019). Surface compared to fine-wire electromyography activity of lower leg muscles at different walking speeds.. In: : . Paper presented at International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019.
Open this publication in new window or tab >>Surface compared to fine-wire electromyography activity of lower leg muscles at different walking speeds.
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2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Summary: Surface and fine-wire electromyography activity of flexor hallucis longus, soleus, medial and lateral gastrocnemius and tibialis anterior muscles was measured simultaneously during walking at four different speeds to examine whether signals recorded with the two methods exhibit similar signal characteristics. We found statistical differences between methods at all walking speeds in soleus and tibialis anterior, at all speeds except fast walking in flexor hallucis longus, and at faster speeds in lateral gastrocnemius. No differences were found in medial gastrocnemius at any speed or in lateral gastrocnemius at slow and preferred speed walking.

National Category
Medical and Health Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5990 (URN)
Conference
International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019
Available from: 2020-01-18 Created: 2020-01-18 Last updated: 2020-01-20Bibliographically 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
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ORCID iD: ORCID iD iconorcid.org/0000-0002-7456-8606

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