Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study

Authors

Firat AKCA
Dilara Erkan (ORCID: https://orcid.org/0000-0002-2403-4841)
Cengizhan Sarı (ORCID: https://orcid.org/0000-0002-8601-6374)
Mehmet Can Gundem (ORCID: https://orcid.org/0009-0009-2944-3714)
Busra Yilmaz
Izzet Karakulak
Halit Sar
Ulas Can Yildirim
Selin Yildirim Tuncer
Serhat Ozdenk

Institutions

Muş Alparslan University (TR)
English Institute of Sport (GB)
Ankara University (TR)
Mardin Artuklu University (TR)
Lokman Hekim Üniversitesi (TR)
State University of Physical Education and Sport (MD)
Sinop University (TR)
Gazi University (TR)

Publication Details

Journal: Frontiers in Nutrition
Published: 2026-01-26
DOI: https://doi.org/10.3389/fnut.2025.1751673
Primary Topic: Coffee research and impacts
Type: article
Field-Weighted Citation Impact: 0.00

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article

Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study

Firat AKCA, Dilara Erkan, Cengizhan Sarı, Mehmet Can Gundem et al.

Jan 26, 2026

Frontiers in Nutrition

Coffee research and impacts

article

Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study

Firat AKCA, Dilara Erkan, Cengizhan Sarı, Mehmet Can Gundem, Busra Yilmaz, Izzet Karakulak, Halit Sar, Ulas Can Yildirim, Selin Yildirim Tuncer, Serhat Ozdenk

January 26, 2026article en

Abstract

No abstract available for this paper.

Frontiers in NutritionVol. 12

Muş Alparslan University (TR), English Institute of Sport (GB), Ankara University (TR), Mardin Artuklu University (TR), Lokman Hekim Üniversitesi (TR), State University of Physical Education and Sport (MD), Sinop University (TR), Gazi University (TR)

Openalex Percentile: Top 76%

Coffee research and impacts

DOI Open Access PDF OpenAlex

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Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study — Firat AKCA, Dilara Erkan, et al. · Frontiers in Nutrition (2026) | TGRS Research Map | TGRS