The Effect of Acute Taurine Ingestion on Endurance Performance in Well Trained Cyclists
Bibliographic record
Abstract
Many currently marketed “energy” drinks include taurine as an ingredient. It has been suggested that taurine has ergogenic properties, but scientific evidence in support of this claim is lacking. Previous studies have examined the effects of supplements containing taurine and many additional ingredients, but not taurine alone. PURPOSE: This study was designed to examine whether taurine (T) ingestion just prior to exercise would improve endurance performance during prolonged cycling as compared to placebo (PL) ingestion and a second placebo (PL2) ingestion, where subjects were told they were receiving taurine, but were not. METHODS: Eleven endurance trained male cyclists and triathletes (age, 28.6 ± 1.9 yr; mass, 74.9 ± 2.7 kg; VO2max, 56.7 ± 1.6 ml/kg/min) performed 2 practice trials, where they cycled at ∼65% of their VO2max for 90 min followed immediately by a time trial where they completed 5 kJ of work/kg body mass as fast as possible. The subjects then completed 3 experimental trials where they consumed 500 ml of Crystal Light™ with either 2000 mg of taurine (T) or nothing added (PL, PL2) 1 hour prior to the 90 min sub-maximal cycle and time trial. The trials were conducted in a randomized, cross-over design. The T and PL trials were administered in a double blind fashion and the PL2 trial was single blind. All meals and snacks 24 hours prior to each trial were provided to the subject to ensure identical diets and macronutrient composition (62% carbohydrate; 24% fat; 14% protein) for each trial. The subjects consumed a sports drink at regular intervals during the cycling trials and ingested the same amount of fluid and carbohydrate in all trials. Expired gas was collected at 15 min intervals during the 90 min sub-maximal cycle. Heart rate and rating of perceived exertion were taken at 15 min intervals throughout the entire ride and at exhaustion. RESULTS: There was no difference in time trial performance between trials (T, 1648 ± 121 vs. PL, 1572 ± 93 vs. PL2, 1561 ± 87 sec). Measured O2 consumption (T, 2.931 ± 0.125 vs. PL, 2.943 ± 0.113 vs. PL2, 2.929 ± 0.111 1/min), CO2 production and calculated respiratory exchange ratios (T, 0.907 ± 0.013 vs. PL, 0.900 ± 0.012 vs. PL2, 0.918 ± 0.010) were unaffected by taurine ingestion or the verbal suggestion that taurine had been ingested. There were also no differences between trials in the heart rate and RPE responses during the 90 min of sub-maximal cycling and the time trial. CONCLUSION: These data indicate that the acute ingestion of 2000 mg of taurine 1 hour before exercise does not enhance time trial performance following prolonged sub-maximal cycling in endurance-trained cyclists and triathletes.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".