TY - JOUR
T1 - The effects of enteric-coated sodium bicarbonate supplementation on 2 km rowing performance in female CrossFit® athletes
AU - Martin, Robyn A. X. J.
AU - Hilton, Nathan P.
AU - Sparks, S. Andy
AU - Saunders, Bryan
AU - Naughton, Lars Mc
N1 - Publisher Copyright:
© 2023, The Author(s).
PY - 2023/1/27
Y1 - 2023/1/27
N2 - Purpose: Sodium bicarbonate (SB) supplementation can improve exercise performance, but few studies consider how effective it is in female athletes. The aim of the study was to establish the effect of individually timed pre-exercise SB ingestion on 2 km rowing time trial (TT) performance in female athletes. Methods: Eleven female CrossFit® athletes (mean ± SD age, 29 y ± 4 y, body mass, 64.5 kg ± 7.1 kg, height, 1.7 m ± 0.09 m, peak oxygen uptake [VO2peak], 53.8 ± 5.7 mL·kg−1∙min−1). An initial trial identified individual time-to-peak [HCO3−] following enteric-coated 0.3 g·kg−1 BM SB ingestion. Participants then completed a 2 km TT familiarisation followed by a placebo (PLA) or SB trial, using a randomised cross-over design. Results: The ingestion of SB improved rowing performance (514.3 ± 44.6 s) compared to the PLA (529.9 ± 45.4 s) and FAM trials (522.2 ± 43.1 s) (p = 0.001, pη2 = 0.53) which represents a 2.24% improvement compared to the PLA. Individual time-to-peak alkalosis occurred 102.3 ± 22.1 min after ingestion (range 75–150 min) and resulted in increased blood [HCO3-] of 5.5 ± 1.5 mmol⋅L−1 (range = 3.8–7.9 mmol⋅L−1). The change in blood [HCO3-] was significantly correlated with the performance improvement between PLA and SB trials (r = 0.68, p = 0.020). Conclusions: Ingesting a 0.3 g·kg−1 BM dose of enteric-coated SB improves 2 km rowing performance in female athletes. The improvement is directly related to the extracellular buffering capacity even when blood [HCO3-] does not change ≥ 5.0 mmol⋅L−1.
AB - Purpose: Sodium bicarbonate (SB) supplementation can improve exercise performance, but few studies consider how effective it is in female athletes. The aim of the study was to establish the effect of individually timed pre-exercise SB ingestion on 2 km rowing time trial (TT) performance in female athletes. Methods: Eleven female CrossFit® athletes (mean ± SD age, 29 y ± 4 y, body mass, 64.5 kg ± 7.1 kg, height, 1.7 m ± 0.09 m, peak oxygen uptake [VO2peak], 53.8 ± 5.7 mL·kg−1∙min−1). An initial trial identified individual time-to-peak [HCO3−] following enteric-coated 0.3 g·kg−1 BM SB ingestion. Participants then completed a 2 km TT familiarisation followed by a placebo (PLA) or SB trial, using a randomised cross-over design. Results: The ingestion of SB improved rowing performance (514.3 ± 44.6 s) compared to the PLA (529.9 ± 45.4 s) and FAM trials (522.2 ± 43.1 s) (p = 0.001, pη2 = 0.53) which represents a 2.24% improvement compared to the PLA. Individual time-to-peak alkalosis occurred 102.3 ± 22.1 min after ingestion (range 75–150 min) and resulted in increased blood [HCO3-] of 5.5 ± 1.5 mmol⋅L−1 (range = 3.8–7.9 mmol⋅L−1). The change in blood [HCO3-] was significantly correlated with the performance improvement between PLA and SB trials (r = 0.68, p = 0.020). Conclusions: Ingesting a 0.3 g·kg−1 BM dose of enteric-coated SB improves 2 km rowing performance in female athletes. The improvement is directly related to the extracellular buffering capacity even when blood [HCO3-] does not change ≥ 5.0 mmol⋅L−1.
KW - Gastrointestinal symptoms
KW - Acid–base balance
KW - Extracellular Buffer
KW - Time trial
UR - http://dx.doi.org/10.1007/s00421-023-05140-4
U2 - 10.1007/s00421-023-05140-4
DO - 10.1007/s00421-023-05140-4
M3 - Article (journal)
C2 - 36705750
SN - 1439-6319
VL - 123
SP - 1191
EP - 1198
JO - European Journal of Applied Physiology
JF - European Journal of Applied Physiology
IS - 6
ER -