Assessment of the specificity of cardiopulmonary response during tethered swimming using a new snorkel device - Pinna, M; Milia, R; Roberto, S; Marongiu, E; Olla, S; Loi, A; Ortu, M; Migliaccio, G M; Tocco, F; Concu, A; Crisafulli, A (J Physiol Sci, 2013)