Contents I. Introduction
Parkinson's disease (PD) is the second most common neurodegenerative disease in the people aged over 40 years. It is a progressive disorder of the nervous system due to the increasing death of the nerve cells in the substantia nigra located within the basal ganglia of the brain [1]. Alzheimer's disease (AD), similarly, is a progressive neurological degenerative disease that causes problems with memory, thinking and behavior. For patients with AD and PD, gait disorders, cognitive frailty, and memory impairments will increasingly become more obvious with patient's condition worsening [2]. These symptoms can cause severe consequences such as falls, fractures, reduced mobility, loss of independence, and increased cardiovascular morbidity and mortality. The literature evidences the importance of the monitoring of any increase in the spatial variability and temporal parameters of gait in older adults who suffer from falls, frailty, or degenerative neuromuscular pathologies [3]. Gait analysis is an important tool for clinicians and other health professionals to assess gait patterns related to functional limitations due to neurological or orthopedic conditions [4]. Furthermore, gait analysis is very important both for the purposes of early diagnosis and to characterize the evolution of all neurological diseases.
