Effect of induced alkalosis on performance during a field-simulated BMX cycling competition

Journal of Science and Medicine in Sport
Ana B PeinadoMikel Zabala

Abstract

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. Double-blind cross-over study. 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. 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>...Continue Reading

Citations

Dec 3, 2020·European Journal of Sport Science·Amin DaneshfarDaniel Gahreman
Feb 7, 2021·Journal of the International Society of Sports Nutrition·Jorge Lorenzo CalvoSergio Lorenzo Jiménez
Sep 11, 2021·Journal of the International Society of Sports Nutrition·Jozo GrgicBill I Campbell

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