Reliability of electromagnetic tracking of scapular orientation and position in healthy sendentary individuals

Electromagnetic systems for motion analysis are claimed as a precise technique for tracking position and orientation of human body segments. To date, reliability electromagnetic tracking was described only for the dynamic assessment of the scapula motion, and no reliability studies on its resting po...

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Published in:Revista brasileira de cineantropometria & desempenho humano 2014-01, Vol.16 (6), p.689-697
Main Authors: Biazotto, Camila Choqueta, Camarini, Paula Maria Ferreira, Tucci, Helga Tatiana, McQuade, Kevin James, de Oliveira, Anamaria Siriani
Format: Article
Language:Portuguese
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Summary:Electromagnetic systems for motion analysis are claimed as a precise technique for tracking position and orientation of human body segments. To date, reliability electromagnetic tracking was described only for the dynamic assessment of the scapula motion, and no reliability studies on its resting posture or positioning were found. The aim of this study was to analyze intra- and inter-session reliabilities and absolute errors of the scapular orientation and position at habitual resting posture in healthy individuals. Twenty-two shoulder symptom-free individuals non participants in professional or recreational sports activities involving upper extremities were volunteers in this study. The equipment used was 3SPACE Liberty system (Polhemus Inc.). The same examiner collected the kinematic data from subjects in two different sessions, with an interval from seven to ten days. Intraclass Correlation Coefficient (ICC sub(2,1) and ICC sub(2,k)) and Standard Error of Measurement (SEM) were calculated. Inter-session reliability ranged from good to excellent (ICC from 0.66 to 0.96) and intra-session reliability was excellent (ICC > or = 0.97). SEM values found for linear distances were smaller than 0.02 cm and scapular rotations ranged from 0.72[degrees] to 5.48[degrees]. Results of this study demonstrated that electromagnetic data acquisition of scapula habitual posture is a reliable tool for defining scapular position and orientation in sedentary shoulder symptom-free individuals.Original Abstract: Sistemas eletromagneticos para analise de movimento sao conhecidos como precisos para registrar a posicao e orientacao dos segmentos do corpo humano. Ate o momento, a confiabilidade do registro eletromagnetico foi descrita apenas para a dinamica da escapula, nao sendo encontrados estudos de confiabilidade da posicao de repouso ou postura da mesma. O objetivo deste estudo foi a analise da confiabilidade intra- e inter-sessao e erros absolutos do registro eletromagnetico da posicao e orientacao da escapula na postura habitual de repouso de individuos saudaveis. Foram voluntarios no estudo 22 individuos sem sintomas no complexo articular do ombro e nao-praticantes amadores ou profissionais de esporte e atividade fisica envolvendo os membros superiores. O equipamento utilizado foi o sistema 3SPACE Liberty (Polhemus Inc.). Um mesmo avaliador coletou os dados cinematicos em duas sessoes diferentes com um intervalo de sete a dez dias. O Coeficiente de Correlacao Intraclasse (IC
ISSN:1415-8426
1980-0037
DOI:10.5007/1980-0037.2014v16n6p689