Citations 1
Characterizing circadian rest–activity rhythm patterns across Alzheimer's disease continuum in Down syndrome
Giménez, Sandra , Vaqué-Alcázar, Lídia, Clos, Susana, Benejam, Bessy, Carmona-Iragui, Maria, Maure‐Blesa, Lucía, Videla, Laura, Zhu, Nuole , Altuna, Miren, Arranz, Javier, Barroeta, Isabel , Rodríguez-Baz, Íñigo, Bueno, Ana, Fernandez, Susana, Pertierra, Lucía , Alcolea, Daniel, Miller, Bruce, Ruiz, Joaquin, Wu, Hau-Tieng, Lleó, Alberto, Osorio, Ricardo S, Blessing, Esther M, Fortea, Juan, Vaqué‐Alcázar, Lídia , Clos, S. , Benejam, Bessy , Carmona‐Iragui, María , Videla, Laura , Altuna, Miren , Arranz, Javier , Rodríguez‐Baz, Íñigo , Bejanin, Alexandre , Fernández, Susana , Soriano, Laura del Hoyo , Alcolea, Daniel , Miller, Bruce L , Grinberg, Lea T. , Lisgaras, Christos Panagiotis , Lleó, Alberto , Osorio, Ricardo S. , Fortea, Juan
Alzheimer's & Dementia | April 30, 2026 | Volume: 22 | Issue: 5 | Pages: No page available
Abstract INTRODUCTION Sleep and circadian rest–activity rhythm (RAR) disruption may bidirectionally relate to Alzheimer's disease (AD). Down syndrome (DS), the most common genetic cause of AD, presents sleep disorders, yet RAR patterns across the DS‐associated AD continuum remain uncharacterized. METHODS We analyzed 7‐day wrist actigraphy in 140 adults with DS (108 asymptomatic; 32 AD dementia) and 41 unimpaired controls. General linear models, adjusted for age, sex, sleep efficiency, and obstructive sleep apnea (OSA) severity, tested group differences, with interaction terms included to evaluate group‐specific associations. RESULTS DS showed lower relative amplitude and higher nocturnal activity, already in asymptomatic individuals. Rhythm strength declined further with AD progression, while regularity and phase timing remained preserved until dementia. Findings were independent of sleep duration and OSA. DISCUSSION Adults with DS showed early RAR disturbance that progressed across the AD continuum, paralleling sporadic AD. Circadian RAR features may be scalable biomarkers of AD progression.