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Center of pressure-based balance evaluation in individuals with Parkinson's disease: a reliability study
Marcelle Brandão Terra1,2, Rubens A Da Silva3,2, Maria E B Bueno1,2
1Department of Physiotherapy, Universidade Estadual de Londrina (UEL) , Londrina, Paraná, Brazil.
Objective:
The purpose of this study was to assess the test-retest reliability of different balance task outcomes, based on center of pressure (COP) measures in individuals with Parkinson's disease.
Method:
In this cross-sectional study, 19 older individuals with idiopathic Parkinson's disease (seven females, 71 ± 7.8 years) performed a set of seven balance tasks on two occasions (a week apart) on an electronic force platform. Each set consisted of: 1) Bipedal; 2) Romberg with open eyes (OE); 3) Romberg with closed eyes (CE); 4) Tandem with OE; 5) Tandem with CE; 6) Tandem with OE using a dual task (DT) condition (simple mathematic operations concomitant with testing); and 7) One-leg stance, with the leg of preference over the force platform, with OE. The test-retest reliability of COP measures was tested using intraclass correlation coefficient (ICC) and Bland-Altman plots.
Results:
The ICC results for the different tasks showed that the most reliable para- meters were derived from a 95% confidence ellipse around the COP and mean velocity, with the most reliable task being the Romberg with CE. Conclusions: We confirmed that balance based on COP measures was reliable in individuals with Parkinson's disease, especially during the Romberg condition with closed eyes.