Acute effects of intermittent hypoxia–hyperoxia exposure on cardiovascular autonomic function and blood pressure in sedentary older adults: A pilot randomized controlled trial - Arturo Ladriñán-Maestro; Alberto Sánchez-Sierra; Oualid Elfoukahi; Óscar Martín-Moreno; Lucía Ladriñán-Maestro; Jorge Sánchez-Infante (PLoS ONE, 2026)