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A photograph of the setup showing the proximal and distal pairs of Actiwatches (indicated by the solid red arrows) and Geneactiv accelerometers. The pairs are interconnected by a rigid plastic strip. The axes of the Geneactiv (dashed white arrows) are plotted in the distal device. The most sensitive axis of the Actiwatch (solid white arrow) is identical to the z-axis of the Geneactiv.
