Figure 1.

Wearable technologies for the assessment of nocturnal movements. On the left, a representative actigraph placed on the wrist (orange dot) able to record linear accelerations for data analysis through dedicated algorithms. On the right, innovative wearable devices consisting of inertial and surface electromyography sensors. Multiple inertial sensors can be used to create a body area network (green dots and lines) providing three-dimensional information on body motion and position (e.g., 3D Avatar). Surface electromyography sensors record muscle activity that can be integrated with kinematic data through a “sensor fusion” approach.