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    Validación de la Escala Rapid Assessment of Physical Activity (RAPA) en población chilena adulta consultante en Atención Primaria
    (2015)
    PÉREZ EWERT, JANET CAROLA  
    ;
    Claudia Bustamante
    ;
    Solange Campos
    ;
    Hugo Sánchez
    ;
    Angela Beltrán
    <jats:p>ntroducción: la práctica de actividad física es esencial para el cuidado de la salud. Se requiere contar con instrumentos que permitan medirla y monitorear los cambios en las personas que la practican. Objetivos: adaptar culturalmente el cuestionario Rapid Assessment of Physical Activity (RAPA), y estimar sus propiedades psicométricas, su validez y confiabilidad, para medir el nivel de actividad física en personas adultas consultantes en centros de atención primaria en Santiago (Chile). Materiales y métodos: el RAPA adaptado fue aplicado a 180 adultos asistentes a 5 centros de salud. Se determinó su índice de masa corporal (IMC) y circunferencia de cintura (CC). Resultados: las puntuaciones en la escala RAPA se relacionaron en forma inversa y significativa con el perímetro de cintura y el IMC. Las personas categorizadas con bajo nivel de actividad física (Poco Activo y Poco Activo Regular Ligero) presentan un IMC promedio más elevado y son más frecuentemente categorizados con CC alterada. La confiabilidad del instrumento fue moderada (r = 0,61; K = 0,34). Conclusiones: el RAPA en su versión en español adaptada para Chile, es un instrumento de fácil aplicación, que pese a su moderada confiabilidad, logra ser sensible al desarrollo de actividad física, que presenta una relación coherente con los parámetros antropométricos de IMC y CC sensibles a dicha actividad.</jats:p>
    Scopus© Citations 8  1
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    Priming overconfidence in belief systems reveals negative return on postural control mechanisms
    (2022)
    CASTRO ABARCA, PATRICIA BERNARDITA  
    ;
    Efstratia Papoutselou
    ;
    Sami Mahmoud
    ;
    Shahvaiz Hussain
    ;
    Constanza Fuentealba Bassaletti
      3Scopus© Citations 9
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    Dissociated motor learning and de-adaptation in patients with functional gait disorders
    (2020)
    Denise Lin
    ;
    CASTRO ABARCA, PATRICIA BERNARDITA  
    ;
    Amy Edwards
    ;
    Akila Sekar
    ;
    Mark J Edwards
    <jats:title>Abstract</jats:title> <jats:p>Walking onto a stationary platform that had been previously experienced as moving generates a locomotor after-effect—the so-called ‘broken escalator’ phenomenon. The motor responses that occur during locomotor after-effects have been mapped theoretically using a hierarchal Bayesian model of brain function that takes into account current sensory information that is weighted according to prior contextually-relevant experiences; these in turn inform automatic motor responses. Here, we use the broken escalator phenomenon to explore motor learning in patients with functional gait disorders and probe whether abnormal postural mechanisms override ascending sensory information and conscious intention, leading to maladaptive and disabling gait abnormalities. Fourteen patients with functional gait disorders and 17 healthy control subjects walked onto a stationary sled (‘Before’ condition, five trials), then onto a moving sled (‘Moving’ condition, 10 trials) and then again onto the stationary sled (‘After’ condition, five trials). Subjects were warned of the change in conditions. Kinematic gait measures (trunk displacement, step timing, gait velocity), EMG responses, and subjective measures of state anxiety/instability were recorded per trial. Patients had slower gait velocities in the Before trials (P &amp;lt; 0.05) but were able to increase this to accommodate the moving sled, with similar learning curves to control subjects (P = 0.87). Although trunk and gait velocity locomotor after-effects were present in both groups, there was a persistence of the locomotor after-effect only in patients (P &amp;lt; 0.05). We observed an increase in gait velocity during After trials towards normal values in the patient group. Instability and state anxiety were greater in patients than controls (P &amp;lt; 0.05) only during explicit phases (Before/After) of the task. Mean ‘final’ gait termination EMG activity (right gastrocnemius) was greater in the patient group than controls. Despite a dysfunctional locomotor system, patients show normal adaptive learning. The process of de-adaptation, however, is prolonged in patients indicating a tendency to perpetuate learned motor programmes. The trend to normalization of gait velocity following a period of implicit motor learning has implications for gait rehabilitation potential in patients with functional gait disorders and related disorders (e.g. fear of falling).</jats:p>
      20Scopus© Citations 24