Empirical quantification of internal and external rotation muscular co-activation ratios in healthy shoulders.
Biomechanical models used to estimate joint loads often predict that antagonistic muscles are inactive or underestimate their contributions [3, 5]. This can result in systematic underestimation of muscle force predictions and joint contact forces. To test the feasibility of employing an empirical co...
| Publicado en: | Medical & Biological Engineering & Computing Vol. 52; no. 3; pp. 257 - 265 |
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| Autores principales: | , |
| Formato: | research Journal Article |
| Publicado: |
Springer Nature
Mar2014
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104037396&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104037396 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 01400118 PO0 jtl: Medical & Biological Engineering & Computing issn: 01400118 maglogo: N pubinfo: dt: Mar2014 vid: 52 iid: 3 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 104037396 NLM23765130 2012495982 10.1007/s11517-013-1081-2 NLM23765130 104037396 ppf: 257 ppct: 8 formats: fmt: @attributes: type: P tig: atl: Empirical quantification of internal and external rotation muscular co-activation ratios in healthy shoulders. aug: au: Brookham, Rebecca L Dickerson, Clark R affil: Kinesiology Department, Faculty of Applied Health Sciences, University of Waterloo, Waterloo, ON, N2L 3G1, Canada. sug: subj: Kinematics Models, Biological Shoulder Physiology Adolescence Adult Electromyography Female Human Humerus Physiology Male Research, Medical Posture Regression Rotation Rotator Cuff Physiology Young Adult Adolescent: 13-18 years Adult: 19-44 years Female Male ab: Biomechanical models used to estimate joint loads often predict that antagonistic muscles are inactive or underestimate their contributions [3, 5]. This can result in systematic underestimation of muscle force predictions and joint contact forces. To test the feasibility of employing an empirical co-activation ratio to improve shoulder muscle force modeling estimates, it was purposed to define the co-activation relationship between humeral internal and external rotator muscles in young healthy adults. Electromyography was recorded from rotator cuff and shoulder musculature of 20 adults. Participants performed 54 submaximal voluntary force exertions of humeral internal and external rotation at various humeral abduction and rotation postures. Empirical co-activation relationships for aggregates of humeral internal and external rotators (non-weighted and PCSA-weighted versions) were well characterized by regression models (r (2) = 0.62-0.70) during internal rotation exertions, but only moderately well (r (2) = 0.35-0.42) during external rotation exertions. Humeral abduction and intensity were important predictors in both exertion types. There was no or minimal improvement in r (2) using PCSA-weighted CIs, suggesting low utility. Quantification and implementation of shoulder co-activation into biomechanical models may improve muscle force and joint load estimates, which could assist in more reliable injury risk and tissue load predictions. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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