Accelerometer wear-site detection: When one site does not suit all, all of the time.
J Sci Med Sport
; 20(4): 368-372, 2017 Apr.
Article
em En
| MEDLINE
| ID: mdl-28117147
ABSTRACT
OBJECTIVES:
Choice of accelerometer wear-site may facilitate greater compliance in research studies. We aimed to test whether a simple method could automatically discriminate whether an accelerometer was worn on the hip or wrist from free-living data.DESIGN:
Cross-sectional.METHODS:
Twenty-two 10-12y old children wore a GENEActiv at the wrist and at the hip for 7-days. The angle between the forearm and the total acceleration vector for the wrist-worn monitor and between the pelvis and the total acceleration vector for the hip-worn monitor (i.e. the angle between the Y-axis component of the acceleration and the total acceleration vector) was calculated for each 5s epoch. The standard deviation of this angle (SDangle) was calculated over time for the wrist-worn and hip-worn monitor for windows of varying lengths. We hypothesised that the wrist angle would be more variable than the hip angle.RESULTS:
Wear site could be discriminated based on SDangle; the shorter the time window the lower the optimal threshold and Area under the Receiver-Operating-Characteristic curve (AUROC) for discrimination of wear-site (AUROC=0.833 (1min) - 0.952 (12h)). Classification accuracy was good for windows of 8min (sensitivity=90%, specificity=87%, AUROC=0.92) and plateaued for windows of ≥60min (sensitivity and specificity >90%, AUROC=0.95-0.96).CONCLUSIONS:
We have presented a robust, computationally simple method that detects whether an accelerometer is being worn on the hip or wrist from 8 to 60min of data. This facilitates the use of wear-site specific algorithms to analyse accelerometer data.Palavras-chave
Texto completo:
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Bases de dados:
MEDLINE
Assunto principal:
Acelerometria
Tipo de estudo:
Diagnostic_studies
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Observational_studies
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Prevalence_studies
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Prognostic_studies
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Risk_factors_studies
Limite:
Child
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Female
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Humans
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Male
Idioma:
En
Revista:
J Sci Med Sport
Assunto da revista:
MEDICINA ESPORTIVA
Ano de publicação:
2017
Tipo de documento:
Article