Trial reportNutrients2014
Caffeine reduces reaction time and improves performance in simulated-contest of taekwondo.
Trial report in Nutrients, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 42 papers, 5 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
42 citing papers in PubMed, 5 syntheses or guidelines pooled it, 107 citations in OpenAlex.
- Advantages of different dietary supplements for elite combat sports athletes: a systematic review and Bayesian network meta-analysis.Scientific reports · 2025Pooled it
- The effects of exercise training and nutritional supplementation on taekwondo performance: a systematic review and meta-analysis.Frontiers in nutrition · 2025Pooled it
- Pooled it
- Pooled it
- Acute caffeine supplementation in combat sports: a systematic review.Journal of the International Society of Sports Nutrition · 2018Pooled it
- Effects of 28-day astaxanthin supplementation on psychological fatigue and biochemical markers in taekwondo athletes: a randomized controlled trial.Nutrition journal · 2026Trial
- Low-dose caffeine enhances cognitive processing but not physical performance in fatigued taekwondo athletes: a randomized crossover trial.Journal of the International Society of Sports Nutrition · 2025Trial
- Combined effects of low-dose caffeine and warm-up music enhance male athletes' performance in simulated Taekwondo combat: a double-blind, randomized crossover trial.Psychopharmacology · 2025Trial
- Effects of different doses of caffeine on cognitive performance in healthy physically active individuals.European journal of nutrition · 2024Trial
- Warm-up music and low-dose caffeine enhance the activity profile and psychophysiological responses during simulated combat in female taekwondo athletes.Scientific reports · 2024Trial
- Caffeine Improves Sprint Time in Simulated Freestyle Swimming Competition but Not the Vertical Jump in Female Swimmers.Nutrients · 2024Trial
- Trial
- Trial
- Effects of 3 mg/kg Body Mass of Caffeine on the Performance of Jiu-Jitsu Elite Athletes.Nutrients · 2022Trial
- Trial
- Effects of caffeine, methylliberine, and theacrine on vigilance, marksmanship, and hemodynamic responses in tactical personnel: a double-blind, randomized, placebo-controlled trial.Journal of the International Society of Sports Nutrition · 2022Trial
- Effects of Beetroot Juice Supplementation on Cognitive Function, Aerobic and Anaerobic Performances of Trained Male Taekwondo Athletes: A Pilot Study.International journal of environmental research and public health · 2021Trial
- Caffeine-Induced Effects on Human Skeletal Muscle Contraction Time and Maximal Displacement Measured by Tensiomyography.Nutrients · 2021Trial
- Effects of acute caffeine, theanine and tyrosine supplementation on mental and physical performance in athletes.Journal of the International Society of Sports Nutrition · 2019Trial
- Caffeine and sodium bicarbonate supplementation alone or together improve karate performance.Journal of the International Society of Sports Nutrition · 2019Trial
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The aim of this study was to investigate the effects of caffeine on reaction time during a specific taekwondo task and athletic performance during a simulated taekwondo contest. Ten taekwondo athletes ingested either 5 mg·kg⁻¹ body mass caffeine or placebo and performed two combats (spaced apart by 20 min). The reaction-time test (five kicks "Bandal Tchagui") was performed immediately prior to the first combat and immediately after the first and second combats. Caffeine improved reaction time (from 0.42 ± 0.05 to 0.37 ± 0.07 s) only prior to the first combat (P = 0.004). During the first combat, break times during the first two rounds were shorter in caffeine ingestion, followed by higher plasma lactate concentrations compared with placebo (P = 0.029 and 0.014, respectively). During the second combat, skipping-time was reduced, and relative attack times and attack/skipping ratio was increased following ingestion of caffeine during the first two rounds (all P < 0.05). Caffeine resulted in no change in combat intensity parameters between the first and second combat (all P > 0.05), but combat intensity was decreased following placebo (all P < 0.05). In conclusion, caffeine reduced reaction time in non-fatigued conditions and delayed fatigue during successive taekwondo combats.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.