Furthermore, a growing body of literature supports the use of wearable sensors to assess standing balance or walking for; i) people with PD and controls [13, 14, 18–29]; ii) PD fallers and non-fallers [30, 31]; iii) people with different PD sub-types [17, 32–35]; iv) carriers and non-carriers of the LRRK2 gene [36]; and v) people at high risk of developing PD (HRPD) [37, 38]. Here, LRRK2 is linked to Parkinson disease.