Validation of the GT3X ActiGraph in children and comparison with the GT1M ActiGraph
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The GT1M ActiGraph, a device to assess physical activity, has been replaced by the triaxial GT3X which includes an inclinometer to detect postures. The purpose of this study was to investigate comparability of the GT3X to the GT1M and to develop activity intensity cut-points for the vector magnitude of the GT3X (VM(GT3X)) in children. Additionally, the study aimed to assess the validity of the GT3X inclinometer for detecting postures.