A Wearable Device to Support the Pull Test in Parkinson Disease

The Pull Test is a common practice to assess the postural instability of patients with Parkinson Disease. Postural instability is a serious issue for elderly and people with neurological disease, which can cause falls. The implementation of the Pull Test consists in observing the user response after providing a tug to the patients’ shoulders, in order to displace the center of gravity from its neutral position. The validity of the test can be compromised by a nonstandard backward tug provided to the patient. The solution proposed in this paper consists of a low cost multisensor system allowing an objective estimation of the input solicitation. Moreover, the system provides supplementary information on the user postural instability, by means of a set of features extracted from the user stabilogram, which are useful to assess the user response. A wide set of experiments have been performed to assess the system capability to provide a rough classification between stable and unstable behaviors. Results obtained demonstrate the validity of the approach proposed.