What limits performance during whole-body incremental exercise to exhaustion in humans? - Morales-Alamo, D; Losa-Reyna, J; Torres-Peralta, R; Martin-Rincon, M; Perez-Valera, M; Curtelin, D; Ponce- Gonzalez, J G; Santana, A; Calbet, J A (J Physiol, 2015)