Shoulder muscle activation strategies differ when lifting or lowering a load
dc.contributor.author | Turpin, Nicolas A. | |
dc.contributor.author | Martinez, Romain | |
dc.contributor.author | Begon, Mickaël | |
dc.date.accessioned | 2023-04-17T11:41:39Z | |
dc.date.available | NO_RESTRICTION | fr |
dc.date.available | 2023-04-17T11:41:39Z | |
dc.date.issued | 2020-08-14 | |
dc.identifier.uri | http://hdl.handle.net/1866/27750 | |
dc.publisher | Springer | fr |
dc.subject | Electromyography | fr |
dc.subject | Eccentric | fr |
dc.subject | Ergonomics | fr |
dc.subject | Shoulder injuries | fr |
dc.subject | Musculoskeletal | fr |
dc.subject | Intramuscular | fr |
dc.title | Shoulder muscle activation strategies differ when lifting or lowering a load | fr |
dc.type | Article | fr |
dc.contributor.affiliation | Université de Montréal. Faculté de médecine. École de kinésiologie et des sciences de l'activité physique | fr |
dc.contributor.affiliation | Université de la Réunion. UFR Sciences de l'homme et de l'environnement. Sciences et techniques des activités physiques et sportives | fr |
dc.identifier.doi | 10.1007/s00421-020-04464-9 | |
dcterms.abstract | Purpose Lowering a load could be associated with abnormal shoulder and scapular motion. We tested the hypothesis that lowering a load involves different shoulder muscle coordination strategies compared to lifting a load. Methods EMG activity of 13 muscles was recorded in 30 healthy volunteers who lifted and lowered a 6, 12 or 18 kg box between three shelves. Kinematics, EMG levels and muscle synergies, extracted using non-negative matrix factorization, were analyzed. Results We found greater muscle activity level during lowering in four muscles (+ 1–2% MVC in anterior deltoid, biceps brachii, serratus anterior and pectoralis major). The movements were performed faster during lifting (18.2 vs. 15.9 cm/s) but with similar hand paths and segment kinematics. The number of synergies was the same in both tasks. Two synergies were identified in ~ 75% of subjects, and one synergy in the others. Synergy #1 mainly activated prime movers’ muscles, while synergy #2 co-activated several antagonist muscles. Synergies’ structure was similar between lifting and lowering (Pearson’s r ≈ 0.9 for synergy #1 and 0.7–08 for synergy #2). Synergy #2 was more activated during lowering and explained the greater activity observed in anterior deltoid, serratus anterior and pectoralis. Conclusion Lifting and lowering a load were associated with similar synergy structure. In 3/4 of subjects, lowering movements involved greater activation of a “multiple antagonists” synergy. The other subjects co-contracted all shoulder muscles as a unit in both conditions. These inter-individual differences should be investigated in the occurrence of shoulder musculoskeletal disorders. | fr |
dcterms.isPartOf | urn:ISSN:1439-6319 | fr |
dcterms.isPartOf | urn:ISSN:1439-6327 | fr |
dcterms.language | eng | fr |
UdeM.ReferenceFournieParDeposant | Turpin, N.A., Martinez, R. & Begon, M. Shoulder muscle activation strategies differ when lifting or lowering a load. Eur J Appl Physiol 120, 2417–2429 (2020). https://doi.org/10.1007/s00421-020-04464-9 | fr |
UdeM.VersionRioxx | Version acceptée / Accepted Manuscript | fr |
oaire.citationTitle | European journal of applied physiology | fr |
oaire.citationVolume | 120 | fr |
oaire.citationStartPage | 2417 | fr |
oaire.citationEndPage | 2429 | fr |
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