Peinado, Ana B.Holgado, DaríasLuque-Casado, AntonioRojo-Tirado, Miguel A.Sanabria, DanielGonzález, CoralMateo-March, ManuelSánchez-Muñoz, CristóbalCalderón, Francisco J.Zabala, Mikel2025-01-202025-01-202019-03-01Peinado, A. B., Holgado, D., Luque-Casado, A., Rojo-Tirado, M. A., Sanabria, D., González, C., Mateo-March, M., Sánchez-Muñoz, C., Calderón, F. J., & Zabala, M. (2019). Effect of induced alkalosis on performance during a field-simulated BMX cycling competition. Journal of science and medicine in sport, 22(3), 335–341. https://doi.org/10.1016/j.jsams.2018.08.0101440-2440https://hdl.handle.net/10115/59417Objectives: The aim of the present study was to test the effect of sodium bicarbonate (NaHCO3-) ingestion on performance during a simulated competition on a Bicycle Motocross (BMX) track. Design: Double-blind cross-over study. Methods: Twelve elite male BMX cyclists (age: 19.2±3.4 years; height: 174.2±5.3cm; body mass: 72.4±8.4kg) ingested either NaHCO3- (0.3g.kg-1 body weight) or placebo 90min prior to exercise. The cyclists completed three races in a BMX Olympic track interspersed with 15min of recovery. Blood samples were collected to assess the blood acid-base status. Performance, cardiorespiratory, heart rate variability (HRV) as well as subjective variables were assessed. Results: The main effect of condition (NaHCO3- vs. placebo) was observed in pH, bicarbonate concentration and base excess (p<0.05), with a significant blood alkalosis. No changes were found in time, peak velocity and time to peak velocity for condition (p>0.05). The HRV analysis showed a significant effect of NaHCO3- ingestion, expressed by the rMSSD30 (root mean square of the successive differences) (p<0.001). There was no effect of condition on oxygen uptake, carbon dioxide production, or pulmonary ventilation (p>0.05). Finally, there was no effect of condition for any subjective scale (p>0.05). Conclusions: We present here the first field condition study to investigate the effect of bicarbonate ingestion over performance in BMX discipline. The results showed that NaHCO3--induced alkalosis did not improve performance in a simulated BMX competition in elite BMX cyclists, although future studies should consider the effects of NaHCO3- on autonomic function as a component of recovery.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/AcidosisAthletic performanceErgogenic aidsHeart rate variabilitySodium bicarbonateArticle10.1016/j.jsams.2018.08.010info:eu-repo/semantics/openAccess