Theoretical and Scientific Underpinnings of Peripheral Muscle Electrostimulation in Cardiac Rehabilitation of the Elderly: A Systematic Review. - Sendrowski, Damian; Polańska-Szczap, Agata; Hus, Beata; Vlaieva, Anastasiia; Markowski, Szymon; Carlé-Calo, Abraham; Kozłowski, Dariusz (Journal of Clinical Medicine, 2026)