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Resumen
Este resumen es generado por máquina.

La actividad física regular (AF) y una mayor aptitud cardiorrespiratoria (ACR) se asocian con una mejor función cognitiva y salud cerebral en adultos mayores. Mantener la aptitud física puede ayudar a compensar los cambios neurodegenerativos, especialmente en aquellos con patología de la enfermedad de Alzheimer (EA) preclínica.

Palabras clave:
actividad físicaaptitud cardiorrespiratoriafunción cognitivasalud cerebraladultos mayoresenfermedad de Alzheimerneurodegeneración

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Área de la Ciencia:

  • Neurociencia
  • Gerontología
  • Medicina Preventiva

Sus antecedentes:

  • La actividad física (AF) es una estrategia potencial para preservar la función cognitiva y reducir el riesgo de demencia.
  • Siguen existiendo preguntas críticas sobre la efectividad, la dosificación y los mecanismos del impacto de la AF en la cognición.
  • Comprender estos factores es crucial para desarrollar enfoques preventivos precisos e intervenciones conductuales.

Objetivo del estudio:

  • Investigar el impacto clínico y las vías biológicas del ejercicio aeróbico en la cognición y la salud cerebral en adultos mayores.
  • Presentar hallazgos preliminares transversales y longitudinales de un ensayo clínico de fase 3 (estudio IGNITE).
  • Examinar las relaciones dosis-respuesta y los factores que influyen en los efectos del ejercicio.

Principales métodos:

  • El estudio IGNITE es un ensayo aleatorizado de 12 meses que involucra a 648 adultos mayores.
  • Los participantes fueron asignados a 150 min/semana de ejercicio aeróbico moderado, 225 min/semana de ejercicio aeróbico moderado o 150 min/semana de estiramiento/tonificación de baja intensidad (control).
  • Se recopilaron datos que incluyeron evaluaciones cognitivas, resonancia magnética cerebral, escáneres de amiloide por PET, biomarcadores sanguíneos relacionados con la EA, acelerometría y aptitud cardiorrespiratoria (ACR) al inicio y a los 12 meses.

Principales resultados:

  • Una mayor aptitud física (ACR) basal se correlacionó con un mayor volumen del hipocampo, una integridad preservada de la sustancia blanca y un mejor rendimiento cognitivo (función ejecutiva, velocidad de procesamiento, memoria).
  • Una mayor actividad física moderada-vigorosa (APMV) basal se asoció con un mejor rendimiento cognitivo multidominio y un envejecimiento cerebral más lento.
  • Una mayor aptitud física y APMV se relacionaron con niveles más bajos de NfL, especialmente en individuos Aβ-positivos, lo que sugiere un efecto protector contra la neurodegeneración.

Conclusiones:

  • Los hallazgos preliminares resaltan la asociación entre la aptitud física, la AF, la cognición, la morfología cerebral y los biomarcadores de la EA en adultos mayores cognitivamente sanos.
  • El estudio identificó múltiples moderadores que influyen en estas relaciones.
  • Estos hallazgos pueden informar las prescripciones de ejercicio individualizadas para optimizar la salud cognitiva y cerebral en personas mayores.