Acute Effects of L-Theanine and L-Tyrosine on Cognitive and Archery Performance (THEA-TYR)
Acute Effects of L-Theanine, L-Tyrosine, and Combined Supplementation on Cognitive and Archery Performance: A Randomized, Placebo-Controlled Crossover Study
This study aims to investigate the acute effects of L-theanine, L-tyrosine, and their combination on cognitive performance and archery performance in trained archers. The study will use a randomized, placebo-controlled, five-condition crossover design involving 21 healthy male archers aged 18 years or older.
Participants will complete five experimental conditions: placebo, L-theanine supplementation (6 mg/kg), L-tyrosine supplementation (50 mg/kg), combined L-theanine and L-tyrosine supplementation, and a no-supplement control condition. Supplements will be administered 60 minutes before performance assessments, with at least 72 hours between experimental sessions.
Cognitive performance will be assessed using the Stroop Test, while archery performance will be evaluated through indoor target shooting at 18 meters. Mood states and perceived exertion will also be assessed using the BRUMS questionnaire and Borg CR-10 scale, respectively.
The study will examine whether these supplementation conditions produce different acute responses in cognitive function and archery performance.
Aperçu de l'étude
Statut
Les conditions
Type d'étude
Inscription (Estimé)
Phase
- N'est pas applicable
Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
La description
Inclusion Criteria:
- 1. Being 18 years of age or older. 2. Being a healthy male individual. 3. Having at least five years of regular archery experience. 4. Training in archery at least three days per week. 5. Having national or international competition experience in archery. 6. Voluntarily agreeing to participate in the study.
Exclusion Criteria:
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1. Having a medical condition that may interfere with participation in the study.
2. Having a known allergy or hypersensitivity to L-theanine or L-tyrosine. 3. Using medications or supplements that may affect cognitive or physical performance during the study period.
4. Being unable to complete all five experimental sessions. 5. Failing to comply with the study procedures.
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
- Objectif principal: Science basique
- Répartition: Randomisé
- Modèle interventionnel: Affectation croisée
- Masquage: Aucun (étiquette ouverte)
Armes et Interventions
Groupe de participants / Bras |
Intervention / Traitement |
|---|---|
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Expérimental: Five-Condition Crossover Group
All participants will complete five experimental conditions in a randomized crossover design: placebo, L-theanine, L-tyrosine, combined L-theanine and L-tyrosine, and no-supplement control. Each participant will receive all five conditions, with at least 72 hours of washout between sessions. |
Participants will receive a placebo 60 minutes before performance assessments. The placebo will be prepared in a form identical to the active supplementation capsules to maintain blinding. Participants will receive L-theanine at a dose of 6 mg/kg body weight, administered 60 minutes before performance assessments. Participants will receive L-tyrosine at a dose of 50 mg/kg body weight, administered 60 minutes before performance assessments. Participants will receive a combination of L-theanine (6 mg/kg body weight) and L-tyrosine (50 mg/kg body weight), administered together 60 minutes before performance assessments. Participants will complete the performance assessments without receiving any supplementation during this condition. This condition will serve as the no-supplement control for comparison with the placebo and active supplementation conditions. |
Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Total Archery Shooting Score
Délai: Immediately after the archery shooting task in each experimental session (approximately 60 minutes after supplement or placebo administration).
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Archery performance will be assessed by recording the total score obtained from 15 arrows (5 sets of 3 arrows) shot at an indoor target from a distance of 18 meters using a 40-cm target face. Higher scores indicate better archery performance. |
Immediately after the archery shooting task in each experimental session (approximately 60 minutes after supplement or placebo administration).
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Collaborateurs et enquêteurs
Parrainer
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude (Estimé)
Achèvement primaire (Estimé)
Achèvement de l'étude (Estimé)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Réel)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Termes MeSH pertinents supplémentaires
Autres numéros d'identification d'étude
- INU-ARCH-2026-01
Plan pour les données individuelles des participants (IPD)
Prévoyez-vous de partager les données individuelles des participants (DPI) ?
Informations sur les médicaments et les dispositifs, documents d'étude
Étudie un produit pharmaceutique réglementé par la FDA américaine
Étudie un produit d'appareil réglementé par la FDA américaine
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