English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Background : No study has demonstrated the effects of sodium bicarbonate plus caffeine (NaHCO 3  + CAF) on power output (PO) distribution (e.g., pacing), physiological parameters and energy system contribution during a 4-km cycling time trial (TT). Thus, we aimed to investigate the effects of NaHCO 3  + CAF on pacing, physiological parameters, and energy system contribution during a 4-km cycling TT.  Methods : Using a double-blind and counterbalanced design, 10 cyclists performed three ingestion protocols (NaHCO 3  + CAF, NaHCO 3  and placebo) followed by a 4-km cycling TT.  Results : 100 min after substance ingestion, the magnitude of change in blood pH and bicarbonate concentration [HCO 3– ] for NaHCO 3  + CAF (+0.04 ± 0.03 and +5.9 ± 1.6 mmol·L −1 , respectively,  P  &lt; .05) and NaHCO 3  (+0.02 ± 0.03 and +4.1 ± 2.0 mmol·L −1 , respectively,  P  &lt; .05) was more pronounced than in placebo (−0.01 ± 0.02 and 0.4 ± 0.9 mmol·L −1 , respectively). The increase in plasma lactate concentration was more pronounced in NaHCO 3  + CAF than in NaHCO 3  and placebo ( P  &lt; .05). Mean ventilation and carbon dioxide production were higher in NaHCO 3  + CAF compared to NaHCO 3  and placebo ( P  &lt; .05). The PO and anaerobic power output were increased at the beginning of the 4-km TT ( P  &lt; .05) in NaHCO 3  + CAF compared to the other two conditions, resulting in an improved overall performance ( P  &lt; .05).  Conclusion : NaHCO 3  + CAF results in a higher PO and increased anaerobic contribution and respiratory parameters during a 4-km cycling TT.

Caffeine Combined With Sodium Bicarbonate Improves Pacing and Overall Performance During a High-Intensity Time Trial