Publicación

Technical variability of the GT3X accelerometer

  • MEDICAL ENGINEERING & PHYSICS
  • Autores
    Santos-Lozano, A; Marin, PJ; Torres-Luque, G; Ruiz, JR; Lucia, A; Garatachea, N
  • Año Publicación
    2012
  • Volumen
    34
  • Número
    6
  • Pág. Inicio
    787
  • Pág. Fin
    790
  • Pág. Fin
    787
Referencia Citadas
19
Citas Web of Science
68
Total de veces citado (Z9)
68
Recuento Uso 180 días
2
Recuento Uso 5 años
12

To analyze the intra- and inter-instrument reliability of the ActiGraph GT3X accelerometer using a vibration table on each orthogonal axis and at five frequencies of motion. Ten GT3X units were subjected to a specific vibration using a motorized vibration table along the vertical, horizontal right-left and horizontal front-back axis, and at 1.1, 2.1, 3.1, 4.1 and 10.2 Hz. The 5 min data for each frequency were analyzed separately for frequency, axis effects, and inter- and intra-instrument variability. We found overall high intra-and inter-instrument reliability for the GT3X accelerometer at frequencies between 2.1 and 4.1 Hz. For frequencies ranging between 2.1 and 4.1 Hz, the intra-instrument coefficient of variation was <= 2.5%. The inter-instrument coefficient of variation ranged widely along axes and frequencies, with the lowest values (<= 9%) corresponding to 2.1-4.1 Hz. The intra-class correlation coefficient for activity counts across frequencies and for all axes was 0.97. Overall, our findings support the use of the GT3X accelerometer as an accurate tool to estimate free-living physical activity, at least within those frequencies that are common to most types of human daily activities. (C) 2012 IPEM. Published by Elsevier Ltd. All rights reserved.


Web financiada por la Junta de Andalucía, Consejería de Conocimiento, Investigación y Universidades, Fondo Europeo de Desarrollo Regional (FEDER), proyecto SOMM17/6107/UG

Web financiada por la Junta de Andalucía, Consejería de Conocimiento, Investigación y Universidades, Fondo Europeo de Desarrollo Regional (FEDER), proyecto SOMM17/6107/UGR