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Revista chilena de neuro-psiquiatría

versión On-line ISSN 0717-9227


CHANA C, Pedro; GONZALEZ R, Hernán A; GUTIERREZ S, Alejandro  y  CACERES A, Cristian. Cinematic parameters in the Tapping test in patients with Parkinson's disease. Rev. chil. neuro-psiquiatr. [online]. 2013, vol.51, n.2, pp.95-101. ISSN 0717-9227.

Motor slowness is the most characteristic motor deficit in Parkinson Disease (PD). The tapping test is a timed motor performance task which has been widely used in evaluation of PD. We study kinematics parameters of tapping test in PD and health control. Methods: Subjects consisted on 12 patients (2 women) with Parkinson's disease (PD) and 6 healthy control subjects (2 women). The mean age 63 ± 9.7years PD and 64.8 ± 13.3 years control. Duration of disease was 5.8 ± 4.1 years. All patients were on levodopa medication. Procedures: All participants performed repetitive Hand/Arm movements between two points placed 25 cm apart horizontally for 20 successive taps ("as fast as possible"). The test was performed independently for each hand. Parkinson patients performed under the best ON condition. We assessed patients clinically using the motor section of the Unified Parkinson Disease Rating Scale (UPDRS). Informed consent was obtained. Apparatus: One standard video camera positioned perpendicularly from two target points recorded movement and referential xy system. A light reflective marker was attached to middle finger. The middle finger marker was manually digitized at a rate of 30 Hz using Kinematics Analysis software. Statistical analysis Kuskal-wallis one way analysis of variance, r spearman correlation. A p value < 0.05 was considered statistically significant. Results: Median Velocity in normal control was 94 ± 11 cm/s and in PD was 67 ± 15 cm/s (p < 0.001). Maximal velocity in normal control was 198 ± 20 cm/s and in PD was 143 ± 33 cm/s (p < 0.001). Median acceleration in normal control was 1630 ± 331 cm/s2 in PD was 966 ± 285 cm/s2 (p < 0.001). Median Movement amplitude in Y plane; in normal control was 28 ± 5 cm and in PD was 21 ± 8 cm (p < 0.01). Median Movement amplitude in Y plane correlated significantly with bradykinesia summary score (r = -0.59, p < 0.001). Conclusion: The kinematics studio provides a very good quantitative approximation to bradykinesia in PD. The UPDRSIII score is only a partial assessment ofbradykinesia and tapping tests obtain objective complementary information.

Palabras clave : Parkinson's disease; bradykinesia; cinematic analysis; Tapping test.

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