Abstract
This study investigated the effects of acute oral taurine ingestion on: (1) the power–time relationship using the 3-min all-out test (3MAOT); (2) time to exhaustion (TTE) 5% > critical power (CP) and (3) the estimated time to complete (Tlim) a range of fixed target intensities. Twelve males completed a baseline 3MAOT test on a cycle ergometer. Following this, a double-blind, randomised cross-over design was followed, where participants were allocated to one of four conditions, separated by 72 h: TTE + taurine; TTE + placebo; 3MAOT + taurine; 3MAOT + placebo. Taurine was provided at 50 mg kg−1, whilst the placebo was 3 mg kg−1 maltodextrin. CP was higher (P < 0.05) in taurine (212 ± 36 W) than baseline (197 ± 40 W) and placebo (193 ± 35 W). Work end power was not affected by supplement (P > 0.05), yet TTE 5% > CP increased (P < 0.05) by 1.7 min after taurine (17.7 min) compared to placebo (16.0 min) and there were higher (P < 0.001) estimated Tlim across all work targets. Acute supplementation of 50 mg kg−1 of taurine improved CP and estimated performance at a range of severe work intensities. Oral taurine can be taken prior to exercise to enhance endurance performance.
Highlights
The critical power (CP) demarcates the boundary between heavy and severe exercise domains (Jones et al 2010)
Whilst the CP is typically measured over several days and bouts of constant load exercise, it has been shown that the finite work capacity above CP (W′) can be completely utilised in a single
This study investigated the effects of acute oral taurine ingestion on: (1) the power–time relationship using the 3-min all-out test (3MAOT); (2) time to exhaustion in the severe-intensity domain and (3) the estimated time to complete a range of fixed target intensities
Summary
The critical power (CP) demarcates the boundary between heavy and severe exercise domains (Jones et al 2010). This test permits reliable and valid calculation of an equivalent CP and a W′ value—the work end power (WEP) (Vanhatalo et al 2007; Dekerle et al 2006). This single-visit test permits quantification of work done above and below the CP; the two-component model (Vanhatalo et al 2007). Parameters of the power–time relationship can be used to describe a ‘gold standard’ demarcation of the metabolic steady state (CP; Jones et al 2019) and the finite capacity of individuals > CP (W′), which can be used in combination to determine exercise performance (Jones et al 2010; Jones and Vanhatalo 2017)
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