Efecto de la retroalimentación visual sobre la velocidad de la marcha después de un accidente cerebrovascular: diseño de caso único
Effects of Visual Feedback on Walking Speed for Stroke Patients: Single-case Design
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Introducción. La recuperación de la marcha es uno de los principales objetivos en rehabilitación después de un ACV. Basados en los principios de aprendizaje motor, se han desarrollado nuevas estrategias en neurorrehabilitación basadas en la práctica repetitiva, orientada a la tarea y la retroalimentación. Esto último ha demostrado ser una de las variables clave para el entrenamiento, por su fácil obtención y manipulación. Sin embargo, aún no existen estudios concluyentes que permitan identificar el efecto real de esta variable y su influencia en la recuperación y el desempeño funcional de la marcha.
Objetivo. Determinar el efecto de la retroalimentación visual sobre la velocidad de la marcha después de un accidente cerebrovascular en adultos con estadios subagudos y crónicos.
Metodología. Diseño de caso único de línea de base múltiple, aleatorio no concurrente de cuatro participantes. Se evaluó la velocidad de la marcha determinando las diferencias en el nivel, la tendencia, la estabilidad de los datos y la no superposición de datos mediante el análisis visual basado en la documentación técnica para diseños de caso único de la What Works Clearinghouse.
Resultados. Cuatro participantes con rango de edad de 19 a 73 años fueron incluidos en el estudio. El cambio en el nivel para todos los participantes demostró un incremento en los valores de la velocidad de la marcha después de la introducción de la intervención (media: 0.76 m/s). El análisis visual de la tendencia estimó aceleración para la línea de intervención para tres participantes. Los datos en la fase de base e intervención cumplieron el criterio de estabilidad medido con el método de banda de dos desviaciones estándar (media: 0.05 m/s); los patrones de cambio demostraron efecto inmediato con mejoría gradual durante la intervención para los participantes 1, 3 y 4. El porcentaje de no superposición de datos mostró efectividad de la intervención para tres de los participantes (PND >91.67%).
Conclusiones. Los hallazgos presentados en este estudio representan un aporte científico que respalda la pertinencia del uso y aplicación de los principios de aprendizaje motor para el desarrollo de nuevas estrategias en rehabilitación motora. Sin embargo, este estudio constituye un primer paso para realizar estudios más robustos que incluyan replicación de las fases en el estudio y la evaluación del seguimiento para determinar la permanencia de los efectos a largo plazo.
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