AI Article Synopsis
- The study explored how sodium bicarbonate (NaHCO) affects cycling performance and recovery in hypoxic conditions, which are known to increase fatigue due to hydrogen ion production.
- Ten trained male cyclists participated in time trials after ingesting different doses of NaHCO or a placebo, revealing that a dosage of 0.3 g/kg body mass led to significant performance improvements over the placebo.
- The findings suggest that consuming NaHCO can enhance exercise capability in low oxygen environments, with the 0.3 g/kg dose being the most beneficial for performance.
Article Abstract
Purpose: Exacerbated hydrogen cation (H) production is suggested to be a key determinant of fatigue in acute hypoxic conditions. This study, therefore, investigated the effects of NaHCO ingestion on repeated 4 km TT cycling performance and post-exercise acid-base balance recovery in acute moderate hypoxic conditions.
Methods: Ten male trained cyclists completed four repeats of 2 × 4 km cycling time trials (TT and TT) with 40 min passive recovery, each on different days. Each TT series was preceded by supplementation of one of the 0.2 g kg BM NaHCO (SBC2), 0.3 g kg BM NaHCO (SBC3), or a taste-matched placebo (0.07 g kg BM sodium chloride; PLA), administered in a randomized order. Supplements were administered at a pre-determined individual time to peak capillary blood bicarbonate concentration ([HCO]). Each TT series was also completed in a normobaric hypoxic chamber set at 14.5% FiO (~ 3000 m).
Results: Performance was improved following SBC3 in both TT (400.2 ± 24.1 vs. 405.9 ± 26.0 s; p = 0.03) and TT (407.2 ± 29.2 vs. 413.2 ± 30.8 s; p = 0.01) compared to PLA, displaying a very likely benefit in each bout. Compared to SBC2, a likely and possible benefit was also observed following SBC3 in TT (402.3 ± 26.5 s; p = 0.15) and TT (410.3 ± 30.8 s; p = 0.44), respectively. One participant displayed an ergolytic effect following SBC3, likely because of severe gastrointestinal discomfort, as SBC2 still provided ergogenic effects.
Conclusion: NaHCO ingestion improves repeated exercise performance in acute hypoxic conditions, although the optimal dose is likely to be 0.3 g kg BM.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6244684 | PMC |
| http://dx.doi.org/10.1007/s00421-018-3975-z | DOI Listing |
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