Recurrence Quantification Analysis at work: Quasi-periodicity based 
interpretation of gait force profiles for patients with Parkinson disease

Afsar, Ozgur; Tirnakli, U.; Marwan, Norbert

doi:10.1038/s41598-018-27369-2

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Recurrence Quantification Analysis at work: Quasi-periodicity based interpretation of gait force profiles for patients with Parkinson disease

Authors

/persons/resource/afsar.ozgur

Afsar, Ozgur
Potsdam Institute for Climate Impact Research;

Tirnakli, U.
External Organizations;

/persons/resource/Marwan

Marwan, Norbert
Potsdam Institute for Climate Impact Research;

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引用

Afsar, O., Tirnakli, U., & Marwan, N. (2018). Recurrence Quantification Analysis at work: Quasi-periodicity based interpretation of gait force profiles for patients with Parkinson disease. Scientific Reports, 8:. doi:10.1038/s41598-018-27369-2.

引用: https://publications.pik-potsdam.de/pubman/item/item_22597

要旨

In this letter, making use of real gait force profiles of healthy and patient groups with Parkinson disease which have different disease severity in terms of Hoehn-Yahr stage, we calculate various heuristic complexity measures of the recurrence quantification analysis (RQA). Using this technique, we are able to evince that entropy, determinism and average diagonal line length (divergence) measures decrease (increases) with increasing disease severity. We also explain these tendencies using a theoretical model (based on the sine-circle map), so that we clearly relate them to decreasing degree of irrationality of the system as a course of gait’s nature. This enables us to interpret the dynamics of normal/pathological gait and is expected to increase further applications of this technique on gait timings, gait force profiles and combinations of them with various physiological signals.