Load-induced increase in muscle activity during 30° abduction in patients with rotator cuff tears and control subjects

Eleonora, Croci; Warmuth, Fabian; Baum, Cornelia; Kovacs, Balazs; Nüesch, Corina; Baumgartner, Daniel; Müller, Andreas Marc; Mündermann, Annegret

doi:10.1186/s10195-023-00720-8

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-30243

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Load-induced increase in muscle activity during 30° abduction in patients with rotator cuff tears and control subjects
Authors:	Eleonora, Croci Warmuth, Fabian Baum, Cornelia Kovacs, Balazs Nüesch, Corina Baumgartner, Daniel Müller, Andreas Marc Mündermann, Annegret
et. al:	No
DOI:	10.1186/s10195-023-00720-8 10.21256/zhaw-30243
Published in:	Journal of Orthopaedics and Traumatology
Volume(Issue):	24
Issue:	41
Issue Date:	4-Aug-2023
Publisher / Ed. Institution:	Springer
ISSN:	1590-9921 1590-9999
Language:	English
Subjects:	Shoulder; Rotator cuff tear; Rotator cuff tendinopathy; Electromyography; Abduction; Scaption; Motion capture; Muscle activity; Magnetic resonance; Load
Subject (DDC):	616.7: Diseases of musculoskeletal system and orthopaedics
Abstract:	Background: Rotator cuff muscles stabilise the glenohumeral joint and contribute to the initial abduction phase with other shoulder muscles. This study aimed to determine if the load-induced increase in shoulder muscle activity during a 30° abduction test is influenced by asymptomatic or symptomatic rotator cuff pathologies. Materials and Methods: Twenty-five patients with unilateral rotator cuff tears (age, 64.3 ± 10.2 years), 25 older control subjects (55.4 ± 8.2 years) and 25 younger control subjects (26.1 ± 2.3 years) participated in this study. Participants performed a bilateral 30° arm abduction and adduction movement in the scapular plane with handheld weights (0–4 kg). Activity of the deltoid, infraspinatus, biceps brachii, pectoralis major, latissimus dorsi and upper trapezius muscles was analysed at maximum abduction angle after normalisation to maximum voluntary contraction. Shoulders were classified into rotator cuff tendinopathy, asymptomatic and symptomatic rotator cuff tears, and healthy based on magnetic resonance images. A linear mixed model (loads, shoulder types) with random effects (shoulder identification) was applied to the log-transformed muscle activities. Results: Muscle activity increased with increasing load in all muscles and shoulder types (P < 0.001), and 1-kg increments in additional weights were significant (P < 0.001). Significant effects of rotator cuff pathologies were found for all muscles analysed (P < 0.05). In all muscles, activity was at least 20% higher in symptomatic rotator cuff tears than in healthy shoulders (P < 0.001). Symptomatic rotator cuff tears showed 20–32% higher posterior deltoid (P < 0.05) and 19–25% higher pectoralis major (P < 0.01) activity when compared with asymptomatic tears. Conclusions: Rotator cuff pathologies are associated with greater relative activity of shoulder muscles, even with low levels of additional load. Therefore, the inclusion of loaded shoulder tests in the diagnosis and rehabilitation of rotator cuff pathologies can provide important insight into the functional status of shoulders and can be used to guide treatment decisions.
URI:	https://digitalcollection.zhaw.ch/handle/11475/30243
Fulltext version:	Published version
License (according to publishing contract):	CC BY 4.0: Attribution 4.0 International
Departement:	School of Engineering
Organisational Unit:	Institute of Mechanical Systems (IMES)
Appears in collections:	Publikationen School of Engineering

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Eleonora, C., Warmuth, F., Baum, C., Kovacs, B., Nüesch, C., Baumgartner, D., Müller, A. M., & Mündermann, A. (2023). Load-induced increase in muscle activity during 30° abduction in patients with rotator cuff tears and control subjects. Journal of Orthopaedics and Traumatology, 24(41). https://doi.org/10.1186/s10195-023-00720-8

Eleonora, C. et al. (2023) ‘Load-induced increase in muscle activity during 30° abduction in patients with rotator cuff tears and control subjects’, Journal of Orthopaedics and Traumatology, 24(41). Available at: https://doi.org/10.1186/s10195-023-00720-8.

C. Eleonora et al., “Load-induced increase in muscle activity during 30° abduction in patients with rotator cuff tears and control subjects,” Journal of Orthopaedics and Traumatology, vol. 24, no. 41, Aug. 2023, doi: 10.1186/s10195-023-00720-8.

ELEONORA, Croci, Fabian WARMUTH, Cornelia BAUM, Balazs KOVACS, Corina NÜESCH, Daniel BAUMGARTNER, Andreas Marc MÜLLER und Annegret MÜNDERMANN, 2023. Load-induced increase in muscle activity during 30° abduction in patients with rotator cuff tears and control subjects. Journal of Orthopaedics and Traumatology. 4 August 2023. Bd. 24, Nr. 41. DOI 10.1186/s10195-023-00720-8

Eleonora, Croci, Fabian Warmuth, Cornelia Baum, Balazs Kovacs, Corina Nüesch, Daniel Baumgartner, Andreas Marc Müller, and Annegret Mündermann. 2023. “Load-Induced Increase in Muscle Activity during 30° Abduction in Patients with Rotator Cuff Tears and Control Subjects.” Journal of Orthopaedics and Traumatology 24 (41). https://doi.org/10.1186/s10195-023-00720-8.

Eleonora, Croci, et al. “Load-Induced Increase in Muscle Activity during 30° Abduction in Patients with Rotator Cuff Tears and Control Subjects.” Journal of Orthopaedics and Traumatology, vol. 24, no. 41, Aug. 2023, https://doi.org/10.1186/s10195-023-00720-8.