Cardiorespiratory fitness profile of volunteer firefighters during intermittent incremental exercise: A cross-sectional study - Denisse Bustos; Filipa Cardoso; Manoel J. Rios; Ricardo Cardoso; Diogo D. Carvalho; Joana Guedes; José Torres Costa; Mário Vaz; J. Santos Baptista; Ricardo J. Fernandes (PLoS ONE, 2026)