Analysis of the heart rate deflection point as a tool for exercise prescription in subjects with COPD: a cross-sectional study - Leite, Marceli Rocha; Ramos, Ercy Mara Cipulo; Kalva-Filho, Carlos Augusto; Silva, Bruna Spolador de Alencar; Freire, Ana Paula Coelho Figueira; Campos, Eduardo Zapaterra; Ramos, Dionei (Physiotherapy Theory and Practice, 2020)