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Trunk Muscle Activation at the Initiation and Braking of Bilateral Shoulder Flexion Movements of Different Amplitudes
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. The Swedish School of Sport and Health Sciences (GIH), Stockholm, Sweden.ORCID iD: 0000-0003-3474-3200
School of Technology and Health, KTH Royal Institute of Technology, Stockholm, Sweden; Department of Information Technology, Uppsala University, Uppsala, Sweden.
The Swedish School of Sport and Health Sciences (GIH), Stockholm, Sweden; Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.
2015 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 10, no 11, article id e0141777Article in journal (Refereed) Published
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Abstract [en]

The aim of this study was to investigate if trunk muscle activation patterns during rapid bilateral shoulder flexions are affected by movement amplitude. Eleven healthy males performed shoulder flexion movements starting from a position with arms along sides (0 degrees) to either 45 degrees, 90 degrees or 180 degrees. EMG was measured bilaterally from transversus abdominis (TrA), obliquus internus (OI) with intra-muscular electrodes, and from rectus abdominis (RA), erector spinae (ES) and deltoideus with surface electrodes. 3D kinematics was recorded and inverse dynamics was used to calculate the reactive linear forces and torque about the shoulders and the linear and angular impulses. The sequencing of trunk muscle onsets at the initiation of arm movements was the same across movement amplitudes with ES as the first muscle activated, followed by TrA, RA and OI. All arm movements induced a flexion angular impulse about the shoulders during acceleration that was reversed during deceleration. Increased movement amplitude led to shortened onset latencies of the abdominal muscles and increased level of activation in TrA and ES. The activation magnitude of TrA was similar in acceleration and deceleration where the other muscles were specific to acceleration or deceleration. The findings show that arm movements need to be standardized when used as a method to evaluate trunk muscle activation patterns and that inclusion of the deceleration of the arms in the analysis allow the study of the relationship between trunk muscle activation and direction of perturbing torque during one and the same arm movement.

Place, publisher, year, edition, pages
Public Library Science , 2015. Vol. 10, no 11, article id e0141777
National Category
Sport and Fitness Sciences Physiotherapy
Research subject
Sports Science; Physiology
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URN: urn:nbn:se:oru:diva-47009DOI: 10.1371/journal.pone.0141777ISI: 000364480900005PubMedID: 26562017OAI: oai:DiVA.org:oru-47009DiVA, id: diva2:878675
Available from: 2015-12-09 Created: 2015-12-09 Last updated: 2017-12-01Bibliographically approved

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Crommert, Martin Eriksson

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