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Schelin, Lina
Publications (10 of 20) Show all publications
Markström, J., Grip, H., Schelin, L. & Häger, C. K. (2019). Dynamic knee control and movement strategies in athletes and non‐athletes in side hops: implications for knee injury. Scandinavian Journal of Medicine and Science in Sports, 29(8), 1181-1189
Open this publication in new window or tab >>Dynamic knee control and movement strategies in athletes and non‐athletes in side hops: implications for knee injury
2019 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 29, no 8, p. 1181-1189Article in journal (Refereed) Published
Abstract [en]

Athletes exposed to rapid maneuvers need a high level of dynamic knee stability and robustness, while also controlling whole body movement, to decrease the risk of non‐contact knee injury. The effects of high‐level athletic training on such measures of movement control have not, however, been thoroughly evaluated. This study investigated whether elite athletes (who regularly perform knee‐specific neuromuscular training) show greater dynamic knee robustness and/or different movement strategies than non‐athletic controls, in relation to overall knee function. Thirty‐nine women (19 athletes, 20 controls) performed standardized rebound side hops (SRSH) while a motion capture system synchronized with two force plates registered three‐dimensional trunk, hip, and knee joint angles and moments. Dynamic knee robustness was evaluated using finite helical axis (FHA) inclination angles extracted from knee rotation intervals of 10°, analyzed with independent t tests. Angle and moment curves were analyzed with inferential methods for functional data. Athletes had superior knee function (less laxity, greater hop performances, and strength) but presented similar FHA inclination angles to controls. Movement strategies during the landing phase differed; athletes presented larger (a) hip flexion angles (during 9%‐29% of the phase), (b) hip adduction moments (59%‐99%), (c) hip internal rotation moments (83%‐89%), and (d) knee flexion moments (79%‐93%). Thus, elite athletes may have a greater ability than non‐athletes to keep the knee robust while performing SRSH more efficiently through increased engagement of the hip. However, dynamic knee robustness associated with lower FHA inclination angles still show room for improvement, thus possibly decreasing knee injury risk.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
Keywords
biomechanics, injury prevention, kinematics, kinetics, sports
National Category
Physiotherapy
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-159135 (URN)10.1111/sms.13432 (DOI)000475431400013 ()30972848 (PubMedID)2-s2.0-85068897729 (Scopus ID)
Available from: 2019-05-20 Created: 2019-05-20 Last updated: 2019-08-12Bibliographically approved
Abramowicz, K., Schelin, L., Sjöstedt de Luna, S. & Strandberg, J. (2019). Multiresolution clustering of dependent functional data with application to climate reconstruction. Stat, 8(1), Article ID e240.
Open this publication in new window or tab >>Multiresolution clustering of dependent functional data with application to climate reconstruction
2019 (English)In: Stat, E-ISSN 2049-1573, Vol. 8, no 1, article id e240Article in journal (Refereed) Published
Abstract [en]

We propose a new nonparametric clustering method for dependent functional data, the double clustering bagging Voronoi method. It consists of two levels of clustering. Given a spatial lattice of points, a function is observed at each grid point. In the first‐level clustering, features of the functional data are clustered. The second‐level clustering takes dependence into account, by grouping local representatives, built from the resulting first‐level clusters, using a bagging Voronoi strategy. Depending on the distance measure used, features of the functions may be included in the second‐step clustering, making the method flexible and general. Combined with the clustering method, a multiresolution approach is proposed that searches for stable clusters at different spatial scales, aiming to capture latent structures. This provides a powerful and computationally efficient tool to cluster dependent functional data at different spatial scales, here illustrated by a simulation study. The introduced methodology is applied to varved lake sediment data, aiming to reconstruct winter climate regimes in northern Sweden at different time resolutions over the past 6,000 years.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
Keywords
bagging Voronoi strategy, climate reconstruction, clustering, dependency, functional data
National Category
Probability Theory and Statistics
Identifiers
urn:nbn:se:umu:diva-164004 (URN)10.1002/sta4.240 (DOI)
Funder
Swedish Research Council, 340-2013-5203Swedish Research Council, 2016-02763
Available from: 2019-10-11 Created: 2019-10-11 Last updated: 2019-10-14Bibliographically approved
Pini, A., Markström, J. & Schelin, L. (2019). Test-retest reliability measures for curve data: an overview with recommendations and supplementary code.. Sports Biomechanics, 1-22
Open this publication in new window or tab >>Test-retest reliability measures for curve data: an overview with recommendations and supplementary code.
2019 (English)In: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116, p. 1-22Article in journal (Refereed) Epub ahead of print
Abstract [en]

The purpose of this paper is to provide an overview of available methods for reliability investigations when the outcome of interest is a curve. Curve data, or functional data, is commonly collected in biomechanical research in order to better understand different aspects of human movement. Using recent statistical developments, curve data can be analysed in its most detailed form, as functions. However, an overview of appropriate statistical methods for assessing reliability of curve data is lacking. A review of contemporary literature of reliability measures for curve data within the fields of biomechanics and statistics identified the following methods: coefficient of multiple correlation, functional limits of agreement, measures of distance and similarity, and integrated pointwise indices (an extension of univariate reliability measures to curve data, inclusive of Pearson correlation, intraclass correlation, and standard error of measurement). These methods are briefly presented, implemented (R-code available as supplementary material) and evaluated on simulated data to highlight advantages and disadvantages of the methods. Among the identified methods, the integrated intraclass correlation and standard error of measurement are recommended. These methods are straightforward to implement, enable results over the domain, and consider variation between individuals, which the other methods partly neglect.

Keywords
Agreement, functional data, kinematics, similarity
National Category
Probability Theory and Statistics Physiotherapy
Identifiers
urn:nbn:se:umu:diva-163944 (URN)10.1080/14763141.2019.1655089 (DOI)31578129 (PubMedID)
Funder
Swedish Research Council, 2016-02763
Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-11
Markström, J. L., Schelin, L. & Häger, C. K. (2018). A novel standardised side hop test reliably evaluates landing mechanics for anterior cruciate ligament reconstructed persons and controls. Sports Biomechanics
Open this publication in new window or tab >>A novel standardised side hop test reliably evaluates landing mechanics for anterior cruciate ligament reconstructed persons and controls
2018 (English)In: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116Article in journal (Refereed) Epub ahead of print
Abstract [en]

We propose a novel one-leg standardised rebound side-hop test (SRSH) specifically designed for detailed analysis of landing mechanics. Anterior cruciate ligament reconstructed persons (ACLR, n = 30) and healthy-knee controls (CTRL, n = 30) were tested for within-session and test-retest (CTRL only, n = 25) reliability and agreement. Trunk, hip and knee angles and moments in sagittal, frontal, and transversal planes during landing, including time to stabilisation (TTS), were evaluated using intra-class correlations (ICCs), average within-person standard deviations (SW) and minimal differences. Excellent within-session reliability were found for angles in both groups (most ICCs > 0.90, SW ≤ 5°), and excellent to good for moments (most ICCs > 0.80, SW ≤ 0.34 Nm/kg). Only knee internal rotation moment showed poor reliability (ICC < 0.4). Test-retest results were excellent to fair for all angles and moments (ICCs 0.47–0.91, SW < 5° and ≤ 0.25 Nm/kg), except for peak trunk lateral bending angle and knee internal rotation moment. TTS showed excellent to fair within-session reliability but poor test-retest results. These results, with a few exceptions, suggest promising potential of evaluating landing mechanics during the SRSH for ACLR and CTRL, and emphasise the importance of joint-specific movement control variables in standardised tasks.

Place, publisher, year, edition, pages
Routledge, 2018
Keywords
reliability, agreement, sports, kinematics, kinetics
National Category
Physiotherapy
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-152960 (URN)10.1080/14763141.2018.153835 (DOI)
Available from: 2018-10-31 Created: 2018-10-31 Last updated: 2019-05-20
Hébert-Losier, K., Schelin, L., Tengman, E., Strong, A. & Häger, C. (2018). Curve analyses reveal altered knee, hip, and trunk kinematics during drop-jumps long after anterior cruciate ligament rupture. Knee (Oxford), 25(2), 226-239
Open this publication in new window or tab >>Curve analyses reveal altered knee, hip, and trunk kinematics during drop-jumps long after anterior cruciate ligament rupture
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2018 (English)In: Knee (Oxford), ISSN 0968-0160, E-ISSN 1873-5800, Vol. 25, no 2, p. 226-239Article in journal (Refereed) Published
Abstract [en]

Background: Anterior cruciate ligament (ACL) ruptures may lead to knee dysfunctions later in life. Single-leg tasks are often evaluated, but bilateral movements may also be compromised. Our aim was to use curve analyses to examine double-leg drop–jump kinematics in ACL-reconstructed, ACL-deficient, and healthy-knee cohorts.

Methods: Subjects with unilateral ACL ruptures treated more than two decades ago (17–28 years) conservatively with physiotherapy (ACLPT, n = 26) or in combination with reconstructive surgery (ACLR, n = 28) and healthy-knee controls (n = 25) performed 40-cm drop–jumps. Three-dimensional knee, hip, and trunk kinematics were analyzed during Rebound, Flight, and Landing phases. Curves were time-normalized and compared between groups (injured and non-injured legs of ACLPT and ACLR vs. non-dominant and dominant legs of controls) and within groups (between legs) using functional analysis of variance methods.

Results: Compared to controls, ACL groups exhibited less knee and hip flexion on both legs during Rebound and greater knee external rotation on their injured leg at the start of Rebound and Landing. ACLR also showed less trunk flexion during Rebound. Between-leg differences were observed in ACLR only, with the injured leg more internally rotated at the hip. Overall, kinematic curves were similar between ACLR and ACLPT. However, compared to controls, deviations spanned a greater proportion of the drop–jump movement at the hip in ACLR and at the knee in ACLPT.

Conclusions: Trunk and bilateral leg kinematics during double-leg drop–jumps are still compromised long after ACL-rupture care, independent of treatment. Curve analyses indicate the presence of distinct compensatory mechanisms in ACLPT and ACLR compared to controls.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
ACL, Biomechanics, Functional data analysis, Interval testing procedure, Lower extremity, Rehabilitation
National Category
Physiotherapy
Identifiers
urn:nbn:se:umu:diva-145719 (URN)10.1016/j.knee.2017.12.005 (DOI)000430519800004 ()29525548 (PubMedID)2-s2.0-85042919592 (Scopus ID)
Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2018-09-19Bibliographically approved
Markström, J., Grip, H., Schelin, L. & Häger, C. (2018). Elite women athletes with superior knee function present similar dynamic knee stability, although different movement strategies, when compared to controls. In: 23rd annual Congress of the European College of Sport Science: Sport Science at the cutting edge, Dublin, July 4-7, 2018: . Paper presented at 23rd Annual Congress of the European College of Sport Science, Dublin, July 4-7, 2018.
Open this publication in new window or tab >>Elite women athletes with superior knee function present similar dynamic knee stability, although different movement strategies, when compared to controls
2018 (English)In: 23rd annual Congress of the European College of Sport Science: Sport Science at the cutting edge, Dublin, July 4-7, 2018, 2018Conference paper, Oral presentation with published abstract (Refereed)
National Category
Physiotherapy
Identifiers
urn:nbn:se:umu:diva-150557 (URN)
Conference
23rd Annual Congress of the European College of Sport Science, Dublin, July 4-7, 2018
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2018-08-21
Abramowicz, K., Häger, C., Pini, A., Schelin, L., Sjöstedt de Luna, S. & Vantini, S. (2018). Nonparametric inference for functional-on-scalar linear models applied to knee kinematic hop data after injury of the anterior cruciate ligament. Scandinavian Journal of Statistics, 45(4), 1036-1061
Open this publication in new window or tab >>Nonparametric inference for functional-on-scalar linear models applied to knee kinematic hop data after injury of the anterior cruciate ligament
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2018 (English)In: Scandinavian Journal of Statistics, Vol. 45, no 4, p. 1036-1061Article in journal (Refereed) Published
Abstract [en]

Motivated by the analysis of the dependence of knee movement patterns during functional tasks on subject-specific covariates, we introduce a distribution-free procedure for testing a functional-on-scalar linear model with fixed effects. The procedure does not only test the global hypothesis on the entire domain but also selects the intervals where statistically significant effects are detected. We prove that the proposed tests are provided with an asymptotic control of the intervalwise error rate, that is, the probability of falsely rejecting any interval of true null hypotheses. The procedure is applied to one-leg hop data from a study on anterior cruciate ligament injury. We compare knee kinematics of three groups of individuals (two injured groups with different treatments and one group of healthy controls), taking individual-specific covariates into account.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018
Keywords
analysis of covariance, functional data, human movement, intervalwise testing, permutation test
National Category
Probability Theory and Statistics
Identifiers
urn:nbn:se:umu:diva-150935 (URN)10.1111/sjos.12333 (DOI)000450039100010 ()
Funder
Swedish Research Council, K2014-99X-21876-04-4Swedish Research Council, 340-2013-5203Swedish Research Council, 2016-02763Västerbotten County Council, ALF VLL548501Västerbotten County Council, VLL-358901Västerbotten County Council, 7002795
Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2019-01-07Bibliographically approved
Markström, J., Grip, H., Schelin, L. & Häger, C. (2018). Similar dynamic knee stability but different movement strategies and between-leg asymmetries for hip and knee joints for ACL-reconstructed persons relative to knee-healthy controls. In: 8th World Congress of Biomechanics, Dublin, July 8-12, 2018: . Paper presented at 8th World Congress of Biomechanics, Dublin, July 8-12, 2018.
Open this publication in new window or tab >>Similar dynamic knee stability but different movement strategies and between-leg asymmetries for hip and knee joints for ACL-reconstructed persons relative to knee-healthy controls
2018 (English)In: 8th World Congress of Biomechanics, Dublin, July 8-12, 2018, 2018Conference paper, Poster (with or without abstract) (Refereed)
National Category
Physiotherapy
Identifiers
urn:nbn:se:umu:diva-150558 (URN)
Conference
8th World Congress of Biomechanics, Dublin, July 8-12, 2018
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2018-08-21
Schelin, L., Tengman, E., Ryden, P. & Häger, C. (2017). A statistically compiled test battery for feasible evaluation of knee function after rupture of the Anterior Cruciate Ligament - derived from long-term follow-up data.. PLoS ONE, 12(5), Article ID e0176247.
Open this publication in new window or tab >>A statistically compiled test battery for feasible evaluation of knee function after rupture of the Anterior Cruciate Ligament - derived from long-term follow-up data.
2017 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, no 5, article id e0176247Article in journal (Refereed) Published
Abstract [en]

PURPOSE: Clinical test batteries for evaluation of knee function after injury to the Anterior Cruciate Ligament (ACL) should be valid and feasible, while reliably capturing the outcome of rehabilitation. There is currently a lack of consensus as to which of the many available assessment tools for knee function that should be included. The present aim was to use a statistical approach to investigate the contribution of frequently used tests to avoid redundancy, and filter them down to a proposed comprehensive and yet feasible test battery for long-term evaluation after ACL injury.

METHODS: In total 48 outcome variables related to knee function, all potentially relevant for a long-term follow-up, were included from a cross-sectional study where 70 ACL-injured (17-28 years post injury) individuals were compared to 33 controls. Cluster analysis and logistic regression were used to group variables and identify an optimal test battery, from which a summarized estimator of knee function representing various functional aspects was derived.

RESULTS: As expected, several variables were strongly correlated, and the variables also fell into logical clusters with higher within-correlation (max ρ = 0.61) than between clusters (max ρ = 0.19). An extracted test battery with just four variables assessing one-leg balance, isokinetic knee extension strength and hop performance (one-leg hop, side hop) were mathematically combined to an estimator of knee function, which acceptably classified ACL-injured individuals and controls. This estimator, derived from objective measures, correlated significantly with self-reported function, e.g. Lysholm score (ρ = 0.66; p<0.001).

CONCLUSIONS: The proposed test battery, based on a solid statistical approach, includes assessments which are all clinically feasible, while also covering complementary aspects of knee function. Similar test batteries could be determined for earlier phases of ACL rehabilitation or to enable longitudinal monitoring. Such developments, established on a well-grounded consensus of measurements, would facilitate comparisons of studies and enable evidence-based rehabilitation.

National Category
Physiotherapy Probability Theory and Statistics
Identifiers
urn:nbn:se:umu:diva-135155 (URN)10.1371/journal.pone.0176247 (DOI)000400645000024 ()28459885 (PubMedID)
Available from: 2017-05-19 Created: 2017-05-19 Last updated: 2018-06-09Bibliographically approved
Markström, J. L., Tengman, E., Grip, H., Schelin, L. & Häger, C. K. (2016). A comparison of knee joint kinematics and kinetics during landings in three one-leg hop tests (hop for distance, vertical hop and side hop) performed by female elite floorball athletes. In: XXI ISEK Congress: Bridges to Innovation. Paper presented at 21st International Society of Electrophysiology and Kinesiology, Chicago, July 5-8, 2016.
Open this publication in new window or tab >>A comparison of knee joint kinematics and kinetics during landings in three one-leg hop tests (hop for distance, vertical hop and side hop) performed by female elite floorball athletes
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2016 (English)In: XXI ISEK Congress: Bridges to Innovation, 2016Conference paper, Poster (with or without abstract) (Refereed)
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:umu:diva-144890 (URN)
Conference
21st International Society of Electrophysiology and Kinesiology, Chicago, July 5-8, 2016
Available from: 2018-02-15 Created: 2018-02-15 Last updated: 2018-06-09Bibliographically approved
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