The effect of sodium bicarbonate mini-tablets ingested in a carbohydrate hydrogel system on 40 km cycling time trial performance and metabolism in trained male cyclists

Introduction Sodium bicarbonate (NaHCO3) ingestion has been found to be ergogenic in high-intensity exercise that ranges
from 1 to 10 min; however, limited studies have investigated high-intensity exercise beyond this duration.
Purpose The present study aimed to determine the efect of NaHCO3 ingested using a carbohydrate hydrogel delivery system
on 40 km time trial (TT) performance in trained male cyclists.
Methods Fourteen trained male cyclists ingested 0.3 g kg−1 BM NaHCO3 (Maurten AB, Sweden) to determine individualised
peak alkalosis, which established time of ingestion prior to exercise. Participants completed a 40 km familiarisation TT, and
two 40 km experimental TTs after ingestion of either NaHCO3 or placebo in a randomised, double-blind, crossover design.
Results NaHCO3 supplementation improved performance (mean improvement=54.14 s±18.16 s; p=0.002, g=0.22) and
increased blood bufering capacity prior to (HCO3
− mean increase=5.6±0.2 mmol L−1, p<0.001) and throughout exercise
(f=84.82, p<0.001, pη2=0.87) compared to placebo. There were no diferences in total gastrointestinal symptoms (GIS)
between conditions either pre- (NaHCO3, 22 AU; Placebo, 44 AU; p=0.088, r=0.46) or post-exercise (NaHCO3, 76 AU;
Placebo, 63 AU; p=0.606, r=0.14).
Conclusion The present study suggests that ingesting NaHCO3 mini-tablets in a carbohydrate hydrogel can enhance 40 km
TT performance in trained male cyclists, with minimal GIS. This ingestion strategy could therefore be considered by cyclists
looking for a performance enhancing ergogenic aid.