**7. Limitations**

The use of Kinect® in this clinical context has reported relative and overall reliability regarding spatiotemporal parameters [45–47]. Further advances in software and hardware are essential to further enhance Kinect's® sensitivity for kinematic measurements [48, 49]. Nevertheless, since the RGBD cameras, like Kinect, are low-cost and portable devices, this represents an opportunity in the field of telemedicine, allowing easy access to gait assessment in the clinical space and allowing remote diagnose in rural areas, where there are no clinical experts. Finally, it is remarkable how the eMotion Capture system can calculate and automatically obtain the gait cycle variables that are considered relevant for decision-making processes in the clinical context of patients with Parkinson's disease.

Some authors propose that arm swing analysis could help in the differentiation between TD and PIG subtypes, but the small sample in this study limited the subgroup analysis. Because Kinect was discontinued from the market, in future research jobs, alternative RGBD cameras, such as the Intel RealSense D435, needs to be investigated.
