RT Journal Article T1 High-intensity high-volume swimming induces more robust signaling through PGC-1α and AMPK activation than sprint interval swimming in m. triceps brachii. A1 Casuso, Rafael A A1 Plaza-Díaz, Julio A1 Ruiz-Ojeda, Francisco J A1 Aragón-Vela, Jerónimo A1 Robles-Sanchez, Cándido A1 Nordsborg, Nikolai B A1 Hebberecht, Marina A1 Salmeron, Luis M A1 Huertas, Jesus R AB We aimed to test whether high-intensity high-volume training (HIHVT) swimming would induce more robust signaling than sprint interval training (SIT) swimming within the m. triceps brachii due to lower metabolic and oxidation. Nine well-trained swimmers performed the two training procedures on separate randomized days. Muscle biopsies from m. triceps brachii and blood samples were collected at three different time points: a) before the intervention (pre), b) immediately after the swimming procedures (post) and c) after 3 h of rest (3 h). Hydroperoxides, creatine kinase (CK), and lactate dehydrogenase (LDH) were quantified from blood samples, and peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) and the AMPKpTHR172/AMPK ratio were quantified by Western blot analysis. PGC-1α, sirtuin 3 (SIRT3), superoxide-dismutase 2 (SOD2), and vascular endothelial growth factor (VEGF) mRNA levels were also quantified. SIT induced a higher release of LDH (p YR 2017 FD 2017-10-03 LK http://hdl.handle.net/10668/11643 UL http://hdl.handle.net/10668/11643 LA en DS RISalud RD Jul 31, 2025