POSTURAL COMPLEXITY AND ADAPTABILITY IN PEOPLE WITH PARKINSON DISEASE

  • : ELISA DE CARVALHO COSTA¹, FELIPE BALISTIERI SANTINELLI¹, GABRIEL FELIPE MORETTO¹, TIAGO PENEDO¹, FABIO AUGUSTO BARBIERI¹
  • : ¹São Paulo State University, UNESP – Bauru/SP, Faculty of Science, Departamento of Physical Education, Human Movement Research Laboratory (MOVI-LAB), Graduate Program in Movement Science
  • : Introduction: Parkinson's disease (PD) affects the dopaminergic neurons in the substantia nigra. Impairments in postural control have been investigated using traditional center-of-pressure (COP) measures, which represents neuromuscular response, but not fractal dynamics or adaptability. However, beyond the neuromuscular response, it is important to understand the adaptability of postural control. The multiscale entropy (MSE) and Detrended Fluctuation Analysis (DFA) are techniques for determining how postural control is modulated. The aim of this study is to investigate the adaptability and complexity of postural control in people with PD. Methods: Twelve older people with PD (PD group) and 12 neurologically healthy older people (control group) participated in this study (CAAE 69287417.8.0000.5398). The participants performed three trials of upright quiet stance (60s) in a force plate (100Hz) with the feet positioned parallel to the hip width. For the DFA, the data were filtered with the 4th order low-pass Butterworth filter with a cut-off frequency of 5Hz and for MSE, the data were filtered using a bandpass Butteworth filter with a frequency of 1-20Hz. The scaling coefficient α of DFA and complexity index (CI) of MSE was calculated in the anterior-posterior (AP) and medial-lateral (ML) directions. An independent t-test was used to statistical analysis to investigate differences between groups. Results: PD group and control group presented similar scaling coefficient α and Ci in AP direction (p <0.73 and p <0.25, respectively) and ML (p <0.06 and p <0.22, respectively). Conclusion: Both groups presented similar DFA and MSE results. One possible explanation is the basis of the postural task. The side-by-side task is not a challenging task, which requires the high level of adaptations of postural control system. For future studies, we suggest performing more challenging postural evaluation to understand the adaptability of postural control in people with PD. Multiscale entropy; Detrended Fluctuation Analysis; Parkinson disease.
  • : locomoção_e_postura
  • : elisa_bes@hotmail.com