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Variability in spatio-temporal pattern of trapezius activity and coordination of hand-arm muscles during a sustained repetitive dynamic task
Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Arbetshälsovetenskap. Högskolan i Gävle, Centrum för belastningsskadeforskning.ORCID-id: 0000-0001-9327-6177
Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Arbetshälsovetenskap. Högskolan i Gävle, Centrum för belastningsskadeforskning.ORCID-id: 0000-0003-1443-6211
Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
2017 (engelsk)Inngår i: Experimental Brain Research, ISSN 0014-4819, E-ISSN 1432-1106, Vol. 235, nr 2, s. 389-400Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The spatio-temporal distribution of muscle activity has been suggested to be a determinant of fatigue development. Pursuing this hypothesis, we investigated the pattern of muscular activity in the shoulder and arm during a repetitive dynamic task performed until participants' rating of perceived exertion reached 8 on Borg's CR-10 scale. We collected high density surface electromyogram (HD-EMG) over the upper trapezius, as well as bipolar EMG from biceps brachii, triceps brachii, deltoideus anterior, serratus anterior, upper and lower trapezius from 21 healthy women. Root mean square (RMS) and mean power frequency (MNF) were calculated for all EMG signals. The barycenter of RMS values over the HD-EMG grid was also determined, as well as normalized mutual information (NMI) for each pair of muscles. Cycle-to-cycle variability of these metrics was also assessed. With time, EMG RMS increased for most of the muscles, and MNF decreased. Trapezius activity became higher on the lateral side than on the medial side of the HD-EMG grid and the barycenter moved in a lateral direction. NMI between muscle pairs increased with time while its variability decreased. The variability of the metrics during the initial 10% of task performance was not associated with the time to task termination. Our results suggest that the considerable variability in force and posture contained in the dynamic task per se masks any possible effects of differences between subjects in initial motor variability on the rate of fatigue development.

sted, utgiver, år, opplag, sider
2017. Vol. 235, nr 2, s. 389-400
Emneord [en]
fatigue development, high density electromyogram, functional connectivity
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-22210DOI: 10.1007/s00221-016-4798-yISI: 000393701700003PubMedID: 27743011Scopus ID: 2-s2.0-84991107108OAI: oai:DiVA.org:hig-22210DiVA, id: diva2:952028
Forskningsfinansiär
Forte, Swedish Research Council for Health, Working Life and Welfare, 2011-0075
Merknad

Additional funding agencies: Ministry of Culture Committee on Sports Research in Denmark; Danish Rheumatism Association 

Tilgjengelig fra: 2016-08-11 Laget: 2016-08-11 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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