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Braz J Phys Ther. 2018 Mar - Apr;22(2):110-119. doi: 10.1016/j.bjpt.2017.09.007. Epub 2017 Sep 29.

Normalization of the trapezius sEMG signal - a reliability study on women with and without neck-shoulder pain.

Author information

1
Departamento de Fisioterapia, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, Brazil.
2
Faculdade das Américas (FAM), São Paulo, SP, Brazil.
3
Departamento de Fisioterapia, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, Brazil. Electronic address: biaoliveira@ufscar.br.

Abstract

OBJECTIVE:

To evaluate within- and between-days reliability of two normalization methods of surface electromyography (sEMG) recordings of the trapezius muscle.

METHODS:

Nineteen women were allocated into 2 groups (healthy and with neck-shoulder pain). The sEMG was recorded in two sessions with 7 days in between sessions. The four portions of the trapezius muscle (the clavicular and acromial fibers of the upper trapezius, the middle and the lower trapezius) were evaluated during maximal and submaximal isometric voluntary contractions. The within- and between-days reliability of both maximal and submaximal contractions were assessed through Intraclass Correlation Coefficient (ICC(2,1) was used for within-day analyses of both maximal and submaximal contractions, and for between-days analyses of maximal contractions while ICC(2,3) was used for between-days analyses of submaximal contractions), Coefficient of Variation, Standard Error of Measurement, and Bland-Altman analysis.

RESULTS:

In general, submaximal contractions presented higher within-day reliability, with higher ICC values (e.g., middle trapezius - mean of 0.97), smaller Coefficient of Variation and Standard Error of Measurement ranges compared to maximal contractions (ICC values, e.g. for middle trapezius - mean of 0.94) in both groups. The same pattern was observed for between-days analyses, with submaximal contractions presenting higher ICC values (e.g., middle trapezius - mean of 0.84), smaller Coefficient of Variation and Standard Error of Measurement ranges than maximal contractions (ICC values, e.g. for middle trapezius - mean of 0.73) in both groups.

CONCLUSION:

Submaximal contractions are recommended for normalization procedures of trapezius sEMG, in both subjects with neck-shoulder pain and healthy individuals.

KEYWORDS:

Neck-shoulder; Pain; Physical therapy; Surface electromyography

PMID:
29033217
PMCID:
PMC5883997
DOI:
10.1016/j.bjpt.2017.09.007
[Indexed for MEDLINE]
Free PMC Article

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