"Objectives: unstructured gait variability is a hallmark of timing gait disorders of Parkinson's disease (PD). Recently, complex temporal structure of stride duration variability has been demonstrated in healthy gait pattern, displaying long-range autocorrelations (LRA)..."
Warlop, T., Chemin, B., Cambier, C., Nozaradan, S., Detrembleur, C., Crevecoeur, F., Stoquart, G., Jeanjean, A., & Lejeune, T. (2015). Does metronome really help timing gait in Parkinson’s disease? Annals of Physical and Rehabilitation Medicine, 58s(58s), e73-e77. https://doi.org/10.1016/j.rehab.2015.07.180 (Original work published 2015)