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.
Studieöversikt
Status
Betingelser
Studietyp
Inskrivning (Beräknad)
Fas
- Inte tillämpbar
Deltagandekriterier
Urvalskriterier
Åldrar som är berättigade till studier
Tar emot friska volontärer
Kön som är behöriga för studier
Beskrivning
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:
-
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.
Studieplan
Hur är studien utformad?
Designdetaljer
- Primärt syfte: Grundläggande vetenskap
- Tilldelning: Randomiserad
- Interventionsmodell: Crossover tilldelning
- Maskning: Ingen (Open Label)
Vapen och interventioner
Deltagargrupp / Arm |
Intervention / Behandling |
|---|---|
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Experimentell: 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. |
Vad mäter studien?
Primära resultatmått
Resultatmått |
Åtgärdsbeskrivning |
Tidsram |
|---|---|---|
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Total Archery Shooting Score
Tidsram: 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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Samarbetspartners och utredare
Sponsor
Studieavstämningsdatum
Studera stora datum
Studiestart (Beräknad)
Primärt slutförande (Beräknad)
Avslutad studie (Beräknad)
Studieregistreringsdatum
Först inskickad
Först inskickad som uppfyllde QC-kriterierna
Första postat (Faktisk)
Uppdateringar av studier
Senaste uppdatering publicerad (Faktisk)
Senaste inskickade uppdateringen som uppfyllde QC-kriterierna
Senast verifierad
Mer information
Termer relaterade till denna studie
Ytterligare relevanta MeSH-villkor
Andra studie-ID-nummer
- INU-ARCH-2026-01
Plan för individuella deltagardata (IPD)
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