Effect of single or combined caffeine and L-Theanine supplementation on shooting and cognitive performance in elite curling athletes: a double-blind, placebo-controlled study

Yilmaz, Umut; Buzdagli, Yusuf; Polat, Muhammed Lütfü; Bakir, Yusuf; Ozhanci, Burak; Alkazan, Sena; Ucar, Halil

doi:10.1080/15502783.2023.2267536

Cited by 3 publications

(1 citation statement)

References 73 publications

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“…Similarly the reaction time in Stroop tests were significantly lower in the combined intake group. [15] Neuroprotection It has been proven in studies on cell cultures and animals that l-theanine has a neuroprotective effect on the neuronal tissue. A study by Takeshima M. at al.…”

Section: Cognitionmentioning

confidence: 99%

Benefits of l-theanine supplementation and its possible role in clinical use – review

Womperski,

Woźniak,

Szymonik

et al. 2024

Qual Sport

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Introduction: Green tea has been a meaningful element of various cultures among the world for ages and its benefits for human health are widely known. Discovery of its ingredients facilitated the profound research of their positive role and mechanisms of action. One of them – l-theanine - seems to have a multidirectional influence on human health. Methods and materials: A review of chosen literature from PubMed database, GoogleScholar database between the years 2000-2023 was conducted using the following keywords: “theanine”, “theanine cognition”, “theanine brain activity”, “theanine neural activity”, “theanine neuroprotection”, “theanine stress”, “theanine cancer”, “theanine immunity”, “theanine safety”, “theanine caffeine”, “theanine metabolism” Aim of study: Review of current knowledge on l-theanine, its benefits for health, mechanisms of action, possible applications in clinical use and safety. Results: L-theanine has a profitable influence on cognitive performance, stress management, neuroprotection, immunity and exhibits anti-cancer properties while having virtually no detrimental side effects. Conclusions: Further research on application of l-theanine in clinical use is necessary as studies carried out on humans included only a limited number of participants.

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Section: Cognitionmentioning

confidence: 99%

Benefits of l-theanine supplementation and its possible role in clinical use – review

Womperski,

Woźniak,

Szymonik

et al. 2024

Qual Sport

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The Impact of Stroboscopic Visual Conditions on the Performance of Elite Curling Athletes

Li,

Zhang,

Wang

et al. 2024

Life

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Background: In elite curling, precise time perception, speed control, and accuracy are critical components of performance. Stroboscopic training enhances visual processing speed, reaction time, motor skill control, and cognitive abilities by challenging the brain to make quick decisions with limited visual information. Purpose: This study aimed to investigate the impact of stroboscopic visual conditions on the key performance aspects of elite athletes in curling to determine whether these effects can be leveraged in long-term training to enhance elite curling performance. Methods: This study involved the participation of 32 national-level male curling athletes (n = 32, age: 19.9 ± 2.2 years, height: 178.0 ± 6.2 cm, body mass: 71.9 ± 10.6 kg, and training age: 2.7 ± 0.9 years). A cross-over controlled experiment was conducted, with participants randomly assigned to either a stroboscopic-first group (n = 16) or a control-first group (n = 16). Each participant completed tests under both stroboscopic and normal visual conditions, including assessments of time perception error, speed control error, and curling accuracy. Paired sample t-tests were employed to analyse performance differences across conditions, and two-factor ANOVA was used to analyse sequence effects. Bonferroni post-hoc tests were used to compare differences if the main effect was significant. Cohen’s d was used for two-group comparisons, whereas ηp2 and Cohen’s f were used for comparisons involving three or more groups. Results: under stroboscopic conditions, participants experienced increased errors in time perception (p < 0.001, Cohen’s d = 1.143), delivery speed control (p = 0.016, Cohen’s d = 0.448), and reduced accuracy (p = 0.029, Cohen’s d = 0.404). The sequence main effect on speed control error was significant (p = 0.025, ηp2 = 0.081, Cohen’s f = 0.297). Conclusions: Stroboscopic visual conditions negatively impacted cognition (especially time perception) and delivery performance focused on speed control and accuracy in elite curling, highlighting the potential and feasibility of using stroboscopic training to enhance elite curling performance.

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Potencial Ergogênico Da Cafeína Associado a Suplementos Variados E O Seu Papel Na Força, Potência E Resistência Muscular

Dums

2024

RMNM

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Atualmente observa-se uma maior taxa de atletas profissionais e/ou amadores utilizando os Auxiliadores Ergogênicos Nutricionais (NEAs), estas substâncias se referem a compostos que auxiliam no treinamento físico, gerando uma maior produção de trabalho, estimulando de forma direta o desempenho muscular, no corpo humano a cafeína é um antagonista dos receptores A1, sendo receptores adrenérgicos acoplados à proteína G, ela impede a interação associada da adenosina, aumentando os níveis de AMPc potencializando a contração muscular, lipólise e ativando o Sistema Nervoso Central. Diante disto, o objetivo geral desta revisão foi analisar quais os benefícios da cafeína em esportes/atividades de forma geral. Estudo do tipo Revisão Sistemática da Literatura, exploratório, retrospectivo, descritivo e quali-quantitativa, delimitado critérios de inclusão e exclusão. Observamos que a utilização da cafeína com 3 mg/kg gerou um melhor rendimento esportivo, ainda associado a taurina, L-teanina, Rhodiola Rosea e Nitrato de Creatina co-ingeridos com a cafeína ofertam melhores resultados, segundo os estudos utilizados não é indicado doses maiores que 6 mg/kg de cafeína pelos efeitos adversos apresentados. Observamos que a utilização da cafeína e outras substâncias ergogênicas pode beneficiar atletas amodorres e/ou profissionais, melhorando seu desempenho esportivo. Ainda, notou-se que a cafeína pode auxiliar na potência anaeróbica e resistência aeróbica, no ganho de potência e resistência muscular em exercícios de curta duração e alta intensidade, tanto no público masculino como feminino.

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Effect of single or combined caffeine and L-Theanine supplementation on shooting and cognitive performance in elite curling athletes: a double-blind, placebo-controlled study

Cited by 3 publications

References 73 publications

Benefits of l-theanine supplementation and its possible role in clinical use – review

Benefits of l-theanine supplementation and its possible role in clinical use – review

The Impact of Stroboscopic Visual Conditions on the Performance of Elite Curling Athletes

Potencial Ergogênico Da Cafeína Associado a Suplementos Variados E O Seu Papel Na Força, Potência E Resistência Muscular

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