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Publikationer (10 of 57) Visa alla publikationer
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.
Öppna denna publikation i ny flik eller fönster >>Ankle joint angle influences hamstring fine-wire and high-density electromyography activity in ramp isometric knee flexions
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2019 (Engelska)Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Nationell ämneskategori
Biofysik
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5919 (URN)
Konferens
International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019
Tillgänglig från: 2019-11-22 Skapad: 2019-11-22 Senast uppdaterad: 2019-11-28Bibliografiskt granskad
Jacques, T. C., Bini, R. R. & Arndt, A. (2019). BILATERAL TENDON STRAIN DURING A 5-KM RUNNING TIME-TRIAL. In: : . Paper presented at International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019.
Öppna denna publikation i ny flik eller fönster >>BILATERAL TENDON STRAIN DURING A 5-KM RUNNING TIME-TRIAL
2019 (Engelska)Konferensbidrag, Poster (med eller utan abstract) (Refereegranskat)
Nationell ämneskategori
Biomaterialvetenskap
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5922 (URN)
Konferens
International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019
Tillgänglig från: 2019-11-22 Skapad: 2019-11-22 Senast uppdaterad: 2019-11-28Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Comparing Surface and Fine-Wire Electromyography Activity of Lower Leg Muscles at Different Walking Speeds.
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2019 (Engelska)Ingår i: Frontiers in Physiology, ISSN 1664-042X, E-ISSN 1664-042X, Vol. 10, artikel-id 1283Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Frontiers Media S.A., 2019
Nyckelord
EMG, ankle plantar flexor muscles, bipedal locomotion, intramuscular electromyography, surface electromyography
Nationell ämneskategori
Idrottsvetenskap
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5900 (URN)10.3389/fphys.2019.01283 (DOI)000497364700001 ()31649557 (PubMedID)
Tillgänglig från: 2019-10-29 Skapad: 2019-10-29 Senast uppdaterad: 2019-12-05
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
Öppna denna publikation i ny flik eller fönster >>Effect of footwear on plantar flexor fine-wire electromyography activity in walking.
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2019 (Engelska)Ingår i: Footwear Science. 2019 Supplement, Vol. 11, p S120-S121: Proceedings of the Fourteenth Footwear Biomechanics Symposium (Kananaskis, Canada, 2019), Taylor & Francis, 2019, Vol. 11, s. S120-S121Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Taylor & Francis, 2019
Nyckelord
barefoot, electromyography, gait analysis, lower limb, shoe
Nationell ämneskategori
Idrottsvetenskap
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5822 (URN)
Konferens
Fourteenth Footwear Biomechanics Symposium, Kananaskis, Canada, July 28-30 2019
Tillgänglig från: 2019-08-27 Skapad: 2019-08-27 Senast uppdaterad: 2019-08-30Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Effects of post activation potentiation on electromechanical delay
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2019 (Engelska)Ingår i: Clinical Biomechanics, ISSN 0268-0033, E-ISSN 1879-1271, Vol. 70, s. 115-122Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Elsevier, 2019
Nyckelord
Muscle, Twitch, Potentiation, Electromechanical delay, Stiffness
Nationell ämneskategori
Fysiologi
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5820 (URN)10.1016/j.clinbiomech.2019.08.001 (DOI)31476603 (PubMedID)
Anmärkning

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

Tillgänglig från: 2019-08-27 Skapad: 2019-08-27 Senast uppdaterad: 2019-09-17Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Examination of the relevance of the ICF cores set for stroke by comparing with the Stroke Impact Scale.
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2019 (Engelska)Ingår i: Disability and Rehabilitation, ISSN 0963-8288, E-ISSN 1464-5165, Vol. 41, nr 5, s. 508-513Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Taylor & Francis, 2019
Nyckelord
International Classification of Functioning Disability and Health, Stroke, Stroke Impact Scale, core sets, perceptions
Nationell ämneskategori
Annan hälsovetenskap
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5229 (URN)10.1080/09638288.2017.1396368 (DOI)000461520600002 ()29502463 (PubMedID)
Tillgänglig från: 2018-03-16 Skapad: 2018-03-16 Senast uppdaterad: 2019-03-29Bibliografiskt granskad
Dickinson, A., Arndt, A. & Rainbow, M. J. (2019). Image Resolution Affects Tracking in vivo Biplanar X-ray Images of the Human Foot During Dynamic Motion. In: : . Paper presented at International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019.
Öppna denna publikation i ny flik eller fönster >>Image Resolution Affects Tracking in vivo Biplanar X-ray Images of the Human Foot During Dynamic Motion
2019 (Engelska)Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Nationell ämneskategori
Biomedicinsk laboratorievetenskap/teknologi
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5920 (URN)
Konferens
International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019
Tillgänglig från: 2019-11-22 Skapad: 2019-11-22 Senast uppdaterad: 2019-11-28Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Impaired mechanical properties of Achilles tendon in spastic stroke survivors: an observational study.
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2019 (Engelska)Ingår i: Topics in Stroke Rehabilitation, ISSN 1074-9357, E-ISSN 1945-5119, Vol. 26, nr 4, s. 261-266Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Taylor & Francis, 2019
Nyckelord
Muscle spasticity, elasticity imaging technique, muscle strength, paresis, tendons
Nationell ämneskategori
Sjukgymnastik
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5664 (URN)10.1080/10749357.2019.1591688 (DOI)000461938700001 ()30890042 (PubMedID)
Tillgänglig från: 2019-03-22 Skapad: 2019-03-22 Senast uppdaterad: 2019-08-14Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>In vivo muscle morphology comparison in post-stroke survivors using ultrasonography and diffusion tensor imaging.
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2019 (Engelska)Ingår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, nr 1, artikel-id 11836Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Nature Publishing Group, 2019
Nationell ämneskategori
Fysiologi
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5819 (URN)10.1038/s41598-019-47968-x (DOI)000480678100035 ()31413264 (PubMedID)
Tillgänglig från: 2019-08-27 Skapad: 2019-08-27 Senast uppdaterad: 2019-09-17
Azcarate, L., Sandamas, P., Arndt, A., Gutierrez-Farewik, E. M. & Wang, R. (2019). Muscle contributions to body mass centre acceleration during the first stance of sprint running. In: : . Paper presented at International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019..
Öppna denna publikation i ny flik eller fönster >>Muscle contributions to body mass centre acceleration during the first stance of sprint running
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2019 (Engelska)Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Nationell ämneskategori
Biofysik
Forskningsämne
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5918 (URN)
Konferens
International Society of Biomechanics, Calgary, Kanada, 31 July - 4 August 2019.
Tillgänglig från: 2019-11-22 Skapad: 2019-11-22 Senast uppdaterad: 2019-11-28Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-1210-6449

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