The Effect of Acute Taurine Ingestion on Endurance Performance in Well Trained Cyclists
Notice bibliographique
Résumé
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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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».