Variability, regularity and coupling measures distinguish PD tremor from voluntary 5Hz tremor.

Abstract:

:A characteristic of Parkinson's disease (PD) is the development of tremor within the 4-6Hz range. One method used to better understand pathological tremor is to compare the responses to tremor-type actions generated intentionally in healthy adults. This study was designed to investigate the similarities and differences between voluntarily generated 4-6Hz tremor and PD tremor in regards to their amplitude, frequency and coupling characteristics. Tremor responses for 8 PD individuals (on- and off-medication) and 12 healthy adults were assessed under postural and resting conditions. Results showed that the voluntary and PD tremor were essentially identical with regards to the amplitude and peak frequency. However, differences between the groups were found for the variability (SD of peak frequency, proportional power) and regularity (Approximate Entropy, ApEn) of the tremor signal. Additionally, coherence analysis revealed strong inter-limb coupling during voluntary conditions while no bilateral coupling was seen for the PD persons. Overall, healthy participants were able to produce a 5Hz tremulous motion indistinguishable to that of PD patients in terms of peak frequency and amplitude. However, differences in the structure of variability and level of inter-limb coupling were found for the tremor responses of the PD and healthy adults. These differences were preserved irrespective of the medication state of the PD persons. The results illustrate the importance of assessing the pattern of signal structure/variability to discriminate between different tremor forms, especially where no differences emerge in standard measures of mean amplitude as traditionally defined.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Morrison S,Cortes N,Newell KM,Silburn PA,Kerr G

doi

10.1016/j.neulet.2012.11.040

subject

Has Abstract

pub_date

2013-02-08 00:00:00

pages

69-74

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(12)01509-1

journal_volume

534

pub_type

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