Effects of an exercise intervention in frail older patients with chronic obstructive pulmonary disease hospitalized due to an exacerbation: a randomized controlled trial Torres-Sánchez, Irene Valenza, Marie Carmen Cabrera-Martos, Irene López-Torres, Isabel Benítez-Feliponi, Ángela Conde-Valero, Alicia 2026-02-23T08:08:15Z 2026-02-23T08:08:15Z 2017 journal article https://hdl.handle.net/10481/111348 open access