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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
Gago, P., Arndt, A., Marques, M. C., Marinho, D. A. & Ekblom, M. (2019). Effects of post activation potentiation on electromechanical delay. Clinical Biomechanics, 70, 115-122
Open this publication in new window or tab >>Effects of post activation potentiation on electromechanical delay
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2019 (English)In: Clinical Biomechanics, ISSN 0268-0033, E-ISSN 1879-1271, Vol. 70, p. 115-122Article in journal (Refereed) Published
Abstract [en]

Electromechanical delay (EMD) presumably depends upon both contractile and tensile factors. It has recently been used as an indirect measure of muscle tendon stiffness to study adaptations to stretching and training. The aim of the present study was to investigate whether contractile properties induced by a 6 s maximum voluntary isometric contraction (MVIC) could affect EMD without altering passive muscle tendon stiffness or stiffness index. Plantar flexor twitches were evoked via electrical stimulation of the tibial nerve in eight highly trained male sprinters before and after a 6 s MVIC in passive isometric or passively shortening or lengthening muscles. For each twitch, EMD, twitch contractile properties and SOLM-Wave were measured. Passive muscle tendon stiffness was measured from the slope of the relation between torque and ankle angle during controlled passive dorsal flexion and stiffness index by curve-fitting the torque angle data using a second-order polynomial function. EMD did not differ between isometric, lengthening or shortening movements. EMD was reduced by up to 11.56 ± 5.64% immediately after the MVIC and stayed depressed for up to 60 s after conditioning. Peak twitch torque and rate of torque development were potentiated by up to 119.41 ± 37.15% and 116.06 ± 37.39%, respectively. Rising time was reduced by up to 14.46 ± 7.22%. No significant changes occurred in passive muscle tendon stiffness or stiffness index. Using a conditioning MVIC, it was shown that there was an acute enhancement of contractile muscle properties as well as a significant reduction in EMD with no corresponding changes in stiffness. Therefore, caution should be taken when using and interpreting EMD as a proxy for muscle tendon stiffness.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Muscle, Twitch, Potentiation, Electromechanical delay, Stiffness
National Category
Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5820 (URN)10.1016/j.clinbiomech.2019.08.001 (DOI)31476603 (PubMedID)
Note

At the time of Paulo Gago's dissertation this article was a manuscript.

Available from: 2019-08-27 Created: 2019-08-27 Last updated: 2019-09-17Bibliographically approved
Paanalahti, M., Berzina, G., Lundgren-Nilsson, Å., Arndt, A. & Sunnerhagen, K. S. (2019). Examination of the relevance of the ICF cores set for stroke by comparing with the Stroke Impact Scale.. Disability and Rehabilitation, 41(5), 508-513
Open this publication in new window or tab >>Examination of the relevance of the ICF cores set for stroke by comparing with the Stroke Impact Scale.
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2019 (English)In: Disability and Rehabilitation, ISSN 0963-8288, E-ISSN 1464-5165, Vol. 41, no 5, p. 508-513Article in journal (Refereed) Published
Abstract [en]

PURPOSE: To examine if the International Classification of Functioning (ICF) core set for stoke contains problems that are relevant for the persons living with stroke as expressed in the Stroke Impact Scale (SIS).

METHODS: Cross-sectional study of 242 persons with previous stroke. The agreement between the perceived problems in the SIS items and problems in the categories of Comprehensive ICF Core Set for stroke were analyzed using percent of agreement and Kappa statistic.

RESULTS: The analyses between 57 items of the SIS and 31 second-level categories of the ICF were conducted. The problems in domains of "Mobility", "Activities of daily living", "Hand function", "Strength" in the SIS had moderate agreement when compared to ICF categories. The SIS domains of "Emotion" and "Communication", as well as some aspects of the "Memory" had slight or fair agreement with corresponding ICF categories. The results of the study suggest that there is acceptable agreement between persons after stroke and health professionals in the physical aspects, but rather poor agreement in the cognitive and emotional aspects of functioning.

CONCLUSIONS: Health professionals do not fully capture the magnitude of emotional or social problems experienced by persons after stroke when using the ICF Core Set as a framework for evaluation. Implications for Rehabilitation The ICF Core Set for Stroke provides comprehensive list of possible health and health related outcomes for persons after stroke. Problems reported in condition-specific patient-reported outcome scales can be important in decision making in rehabilitation. Patients and health professionals tend to agree more on physical than cognitive problems. Examination of the relevance of the ICF cores set for stroke by comparing with the Stroke Impact Scale.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
International Classification of Functioning Disability and Health, Stroke, Stroke Impact Scale, core sets, perceptions
National Category
Other Health Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5229 (URN)10.1080/09638288.2017.1396368 (DOI)000461520600002 ()29502463 (PubMedID)
Available from: 2018-03-16 Created: 2018-03-16 Last updated: 2019-03-29Bibliographically approved
Dias, C. P., Freire, B., Goulart, N. B., Dias De Castro, C., Lemos, F. D., Becker, J., . . . Vaz, M. A. (2019). Impaired mechanical properties of Achilles tendon in spastic stroke survivors: an observational study.. Topics in Stroke Rehabilitation, 26(4), 261-266
Open this publication in new window or tab >>Impaired mechanical properties of Achilles tendon in spastic stroke survivors: an observational study.
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2019 (English)In: Topics in Stroke Rehabilitation, ISSN 1074-9357, E-ISSN 1945-5119, Vol. 26, no 4, p. 261-266Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: The spasticity could lead to decreased functional capacity and changes in musculoskeletal tissue.

OBJECTIVE: To compare the Achilles tendon properties between the affected and contralateral limbs of participants with spasticity due to stroke and the healthy subjects.

METHODS: Fifteen individuals with ankle spasticity due to stroke and 15 healthy subjects were recruited. Maximal isometric ankle joint torque was obtained with an isokinetic dynamometer, and an ultrasound was used to determine tendon length, tendon cross-sectional area, and the medial gastrocnemius myotendinous junction displacement. The Achilles tendon strength, displacement, stress, strain, stiffness, and Young's modulus were obtained during a maximum voluntary isometric plantarflexion contraction.

RESULTS: There were no differences between Achilles tendon length among participants. Both limbs of participants with stroke showed reduced tendon cross-sectional area (~18%) compared to healthy limb. The affected limb showed decreased tendon strength (686 ± 293.3 N), displacement (10.6 ± 1.7 mm), Young's modulus values (849 ± 235.6 MPa), and lower stiffness (196.6 ± 67.6 N/mm) compared to the contralateral limb (strength, 1357.1 ± 294.8 N; displacement, 15.2 ± 5.5 mm; Young's modulus, 1431.8 ± 301.9 MPa; stiffness, 337.5 ± 98.1 N/mm) and to the healthy limb. The contralateral limb also showed decreased tendon strength (~26.2%) and stiffness (~21.5%) compared to the healthy group.

CONCLUSION: There is a decrement in Achilles tendon morphological and mechanical properties of the affected limb in individuals with spasticity due to stroke. The contralateral limb had a thinner tendon more compliant likely to physical activity reduction.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Muscle spasticity, elasticity imaging technique, muscle strength, paresis, tendons
National Category
Physiotherapy
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5664 (URN)10.1080/10749357.2019.1591688 (DOI)000461938700001 ()30890042 (PubMedID)
Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-08-14Bibliographically 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
Sandamas, P., Gutierrez-Farewik, E. M. & Arndt, A. (2019). The effect of a reduced first step width on starting block and first stance power and impulses during an athletic sprint start.. Journal of Sports Sciences, 37(9), 1046-1054
Open this publication in new window or tab >>The effect of a reduced first step width on starting block and first stance power and impulses during an athletic sprint start.
2019 (English)In: Journal of Sports Sciences, ISSN 0264-0414, E-ISSN 1466-447X, Vol. 37, no 9, p. 1046-1054Article in journal (Refereed) Published
Abstract [en]

This study investigated how manipulating first step width affects 3D external force production, centre of mass (CoM) motion and performance in athletic sprinting. Eight male and 2 female competitive sprinters (100m PB: 11.03 ± 0.36 s male and 11.6 ± 0.45 s female) performed 10 maximal effort block starts. External force and three-dimensional kinematics were recorded in both the block and first stance phases. Five trials were performed with the athletes performing their preferred technique (Skating) and five trials with the athletes running inside a 0.3 m lane (Narrow). By reducing step width from a mean of 0.31 ± 0.06 m (Skating) to 0.19 ± 0.03 m (Narrow), reductions were found between the two styles in medial block and medial 1st stance impulses, 1st stance anterior toe-off velocity and mediolateral motion of the CoM. No differences were found in block time, step length, stance time, average net resultant force vector, net anteroposterior impulse nor normalised external power. Step width correlated positively with medial impulse but not with braking nor net anteroposterior impulse. Despite less medially directed forces and less mediolateral motion of the CoM in the Narrow trials, no immediate improvement to performance was found by restricting step width.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
CoM motion, Sprinting, external power, foot placement, impulse
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5479 (URN)10.1080/02640414.2018.1541161 (DOI)000463112500011 ()30460879 (PubMedID)
Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2019-04-23
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
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ORCID iD: ORCID iD iconorcid.org/0000-0002-1210-6449

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